INDUCTION

MOTORS

INDUCTION
FRAME 63 TO 355
LOW TENSION TEFC & SPDP INDUCTION MOTORS

MOTORS

otors
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INDUCTION Ener
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MOTORS
EVERYDAY SOLUTIONS
Dear
Customer, of professionals and state-of-the-art
technology providing reliable and
trouble free products and services on
In pursuance of the culture of
the basis of superior mechanical &
continuous improvement towards
product design.
customer satisfaction, we have now
incorporated the latest designs for The company's operations include
our range of LT AC motors ensuring R&D, manufacturing, marketing and

INDUCTION
better electrical performance as well turnkey projects in clearly defined
as versatility in mechanical features. Core Business Areas, at home and
The standard motors offered are in overseas. Over the last six decades,
compliance with efficiency level 2 of unparalleled growth has seen CG

MOTORS
the proposed revision to IS12615 in emerge as a professionally managed
India as well as CEMEP standards organisation with a workforce of over
prevalent in Europe for Energy 6500 employees including more than
Efficient Motors. These features have 2500 professionals. With 23
given the necessary impetus to the manufacturing units and Centralized
long cherished ambition of being a Support Services, CG offers a
global player in the motor industry comprehensive and multi-faceted
by being comparable to the best in the product range nationally through
world in terms of performance. We strategically located branches and a
take great pleasure in issuing this well-appointed distributor/dealer
booklet with the detailed network. Structured into Strategic
information. Business Units comprising
synergistic groups of responsibility
LT Motors division designs &
centers (divisions), CG is well on the
manufactures a multiformity of
road to exceeding the exacting
Electric Motors (DC & AC) and
standards of Quality and Customer
Alternators with manufacturing
Service.

EVERYDAY SOLUTIONS
 INDEX

CONTENTS PAGE NO.

GENERAL
Standards and Specifications (Indian & International) ..................... 1
Manufacturing Summary ..................... 2
Frame wise output summary ..................... 3
Specifications of Standard products at a glance ..................... 4
Special designs offered ..................... 5
Mounting arrangements ..................... 6
Degree of protection ..................... 7
Noise level, Vibration ..................... 8
Vibration level severity ..................... 9

MECHANICAL FEATURES
Enclosure ..................... 10
Core ..................... 10
Winding ..................... 10
Insulation ..................... 10
Rotor ..................... 10
Slip ring & brush gear ..................... 10
Shaft ..................... 11
Recommended pulley diameter and face width ..................... 11
Permissible axial and radial thrusts on shaft ..................... 12
Threaded centre holes for motor shaft ..................... 13
Bearing reference and lubrication intervals ..................... 14-15
Terminal box ..................... 16
Terminal box details for standard motors ..................... 16
Cable glands ..................... 17
Finish ..................... 17

ELECTRICAL FEATURES
Direction of rotation ..................... 17
Starting methods and torque ..................... 17
Permissible No. of starts per hour ..................... 18
Insulation class ..................... 18
Earthing ..................... 18
Classes of duty ..................... 19
Designation/application of duty type ..................... 20
Diagrams of duty cycles ..................... 21-23
Effect of voltage/frequency variation on motor characteristics ..................... 24
Overload ..................... 24
Rated speed/slip ..................... 24
Locked rotor current ..................... 25
Speed torque characteristics ..................... 25-26
Locked Rotor withstand time calculation ..................... 27-28
 INDEX INDEX

CONTENTS PAGE NO. CONTENTS PAGE NO.

General tolerance on electrical performance ..................... 28 TEFC SR MOTORS
Accessories ..................... 29 DW 132S/M TEFC SR Foot Mounted ..................... 57
Thermistors / Space Heaters ..................... 29 DW 132S/M TEFC SR Flange Mounted ..................... 58
Back up fuse selection chart ..................... 30 NDW 160M/ NDW 355LX TEFC SR Foot Mounted ..................... 59
Power factor improvement chart ..................... 31
SPDP SR MOTORS
Deration factor chart ..................... 32
CW 160M/ CW 200L SPDP SR Foot Mounted ..................... 60
Thermal withstand time for standard TEFC motors ..................... 33
CW 225M/ CW 315MX SPDP SR Foot Mounted ..................... 61
APPLICATIONS
CONNECTION DIGRAMS
Air stream rated motors ..................... 34
Connection Diagram for TEFC motors ..................... 62
Non-Ventilated motors ..................... 34
Multi Speed motors ..................... 34 Connection Diagram for TEFC Two Speed motors ..................... 63

Dual Speed motors ..................... 35 Connection Diagram for TEFC Multispeed motors ..................... 64-65
Dual Voltage motors ..................... 36 Connection Diagram for TEFC Dual Voltage motors ..................... 65
Motors For Various Applications ..................... 37 TERMINAL BOX ARRANGEMENT
TESTING OF MOTORS FRAME AD 63/71 (3 Lead) ..................... 66
Type Tests ..................... 38 FRAME AD 63/71 (6 Lead) ..................... 67
Routine Tests/ Other Tests ..................... 38 FRAME AD 80 ..................... 68
Ordering Information ..................... 39 FRAME ND90S/ND 132M (3 Leads) ..................... 69
GUIDE AND CHECK POINTS FOR MOTOR SELECTION FRAME ND 90S/ND 132M (6 Leads) ..................... 70
Mechanical Aspects ..................... 40
FRAME DW 132S /M ..................... 71
Electrical Aspects ..................... 41
FRAME C/ND 160-180, ND200 ..................... 72
DIMENSIONAL DRAWING OF MOTORS
FRAME C 200/250 AND ND 225/280 ..................... 73
TEFC SCR MOTORS
FRAME C/ND 280-315 ..................... 74
AD 63-132 TEFC Foot Mounted ..................... 42
FRAME C315MX,ND315L/355LX ..................... 75
AD 63-132 TEFC Flange Mounted ..................... 43
AD 63-132 TEFC Foot cum Flange Mounted ..................... 44 PERFORMANCE DATA

AD 63-132 TEFC Face Mounted ..................... 45 Performance Data of TEFC SCR motors (45/75) ..................... 76-78

ND 90S/ND132M TEFC Foot Mounted ..................... 46 Performance Data of TEFC SCR motors (50/70) ..................... 79

ND 90S/ND132M TEFC Flange Mounted ..................... 47 Performance Data of DP SCR motors ..................... 79-80

ND 90S/ND132M TEFC Foot cum Flange Mounted ..................... 48 Performance Data of TEFC SR motors ..................... 81

ND 90S/ND132M TEFC Face Mounted ..................... 49 Performance Data of DP SR motors ..................... 82

ND 160/ND355LX TEFC Foot Mounted ..................... 50 SHIPPING SPECIFICATIONS

ND 160/ND355LX TEFC Flange Mounted ..................... 51 TEFC SCR Foot Mounted motors ..................... 83

ND 160/ND355LX TEFC Foot cum Flange Mounted ..................... 52 TEFC SCR Flange Mounted motors ..................... 84

SPDP SCR MOTORS TEFC SR Foot Mounted motors- TB on Top ..................... 85

C 160M/C200L SPDP Foot Mounted ..................... 53 TEFC SR Foot Mounted motors TB on side ..................... 85

C 225M/C315MX SPDP Foot Mounted ..................... 54 TEFC SR Flange Mounted motors ..................... 86

C 160M/C200L SPDP Flange Mounted ..................... 55 DP SCR Foot Mounted motors ..................... 86

C 225M/C315MX SPDP Flange Mounted ..................... 56 DP SCR Flange Mounted motors ..................... 86
DP SR Foot Mounted motors ..................... 87
 GENERAL

Standard specifications of Electric International standards

Motors
IEC 34 1 : Recommendations for Rotating
The motors comply with the relevant Electrical Machines.
standard specifications. In particular, they IEC 72 1 : Recommendations, Dimensions
meet the requirement of the following & output rating of Electrical
publications: Machines-Foot Mounting.
IEC 72 2 : Recommendations for the
Indian Standards Dimensions and Output Rating
of Electrical Motors-Flange
IS 325 : Three phase Induction Motors
Mounting.
IS 1231 : Dimensions of Three Phase Foot
Mounted AC Induction Motors.
British Standards
IS-2223 : Dimensions of Flange Mounted
BS 3979 : Dimensions of Electric Motors
AC Induction Motors.
BS 4999 : Specification for general
IS 2253 : Designations for Types of
requirements for Rotating
construction and Mounting
Electrical Machines.
Arrangements of Rotating
BS 5000 : Specifications for Rotating
Electrical Machines.
Electrical Machines.
IS 4029 : Guide for Testing Three Phase
Induction Motors.
IS 4691 : Degree of protection provided
by Enclosures for Rotating
Electrical Machinery
IS 4722 : Rotating Electrical Machines
IS 4889 : Methods of Determination of
Efficiency of Rotating Electrical
Machines
IS 6362 : Designation of Methods of
Cooling for Rotating Electrical
Machines
IS 7538 : Three phase Squirrel cage
Induction Motors for Centrifugal
pumps for Agricultural
Applications
IS 8151 : Single Speed Three Phase
Induction Motors for Driving
Lifts.
IS 8789 : Values of Performance
Characteristics for Three Phase
Induction Motors.
IS 12065 : Permissible limits of noise levels
for rotating Electrical machines.
IS 12075 : Mechanical Vibration of
Rotating Electrical Machines,
Measurement, Evaluation and
limits of Vibration Severity.

1
MANUFACTURING RANGE SUMMARY Table Showing Output Of Standard Continuous rated (S1-Duty) Motors

OUTPUT : UP TO 315 kW Frame Type Enclosure Unit Output

TYPE OF ENCLOSURE : Totally Enclosed Fan Cooled (TEFC) 2P 4P 6P 8P
AD63/ND355LX SCR TEFC kW 0.18-315 0.18-400 0.37-275 0.37-200
Totally Enclosed (TE)
Drip Proof (DP) C160/C315MX SCR SPDP kW 9.3-250 9.3-250 7.5-185 3.7-132
Flameproof (Type 'd')
NC100/NC132 SCR DV kW 2.2-30 2.2-30 1.5-18.5 3.7-15
Increased safety (Type 'e')
E80/E315L SCR FLP kW 0.37-200 0.37-200 0.37-160 0.37-132
Non Sparking (Type 'N')
Pressurised Type (Type `p') DW112/NDW355LX SR TEFC kW - 2.2-250 2.2-160 1.5-132

TYPE OF ROTOR : Squirrel cage (SCR) CW160/CW315MX SR SPDP kW - 7.5-225 5.5-160 3.7-132
Slipring (SR)
EW250/EW315L SR FLP kW - 26-160 18.5-132 15-100
MOUNTING : Foot Mounting (B3,B6,B7,B8,V5,V6)
Flange Mounting (B5, V1, V3)
Face Mounting (B14, V18, V19)

TYPE FRAMES MOUNTINGS AVAILABLE

TEFC/TE 63 TO 355LX B3, B5, B6, B7, B8, B34, B35, V1, V3, V5, V6, V36, V18

DP 160 TO 315MX B3, B5, B35, V1, V3, V15, V36,

TYPE 'd' 80 TO 315L B3, B5, B35, V1, V3, V15, V36
B14, B34, (ONLY FOR Frame 80 and 160 To180)
V18, V19, (ONLY. FOR Frame 80)

TYPE 'e' 90S TO 315L B3, B5, B6, B7, B8, B14, B35, B34,
V1, V3, V15, V36, V18, V19

TYPE 'N' 90S TO 315L B3, B5, B14, B35, V1, V3, V5, V6, V15, V36

TYPE 'p' 90L TO 315L B3, B5, B35, V1, V3, V5, V6, V15, V36

VOLTAGE (MEAN) : 100V TO 650V (STD.415V)

FREQUENCY (MEAN) : 5Hz TO 75 Hz (STD.50Hz)
DEGREE OF PROTECTION : UP TO IP56
DUTY : S1 TO S9
VIBRATION LEVEL : LOWEST 5 MICRONS
AMBIENT : -30DEG C TO +65 DEG C
INSULATION CLASS : CLASS F

FOR ANY OTHER REQUIREMENT, KINDLY REFER TO DIVISION

2 3
SPECIFICATIONS OF STANDARD PRODUCTS AT A GLANCE SPECIAL DESIGNS OFFERED

MOTOR TYPE TEFC-SCR TEFC-SR DP-SCR DP-SR ELECTRICAL MECHANICAL

Non Standard Voltage And Frequency Variation Non Standard Mounting Dimensions
VOLTAGE VARIATION 415+/-10%
Duel Voltage (1:2 or 1: 3 Ratio) Special shaft Extension
FREQUENCY VARIATION 50HZ +/-5%
Triple Voltage (1: 3 : 2 Ratio)
COMBINED VARIATION 10% (ABSOLUTE SUM)
FRAME DIMENSIONS AS per IS 1231 Inverter fed Supplies And AC Variable Speed Double shaft Extension
drives
CLASS OF INSULATION “F”
AMBIENT TEMPRATURE/ AS PER RELEVANT PERFORMANCE FIGURES Multispeed Motors Upto 4 different speeds Separately Ventilated
TEMP. RISE (BY RESISTANCE) Motors
ALTITUDE MAXIMUM OF 1000 METER Energy Efficient Motors Low Vibration & Noise Level
RELATIVE HUMIDITY UP TO 100 % UP TO 50 % High Slip Motors Shock Grade Motors
ATMOSPHERIC CONDITION Non corrosive and non hazardous Atmosphere Motors For Frequent starts/stops/reversals Motors for Hazardous areas
RATING/DUTY Continuous/S1 (e.g. crane duty)
DEGREE OF PROTECTION IP 55 (As per IS 4691) IP 21For Frames from 160 and above Torque Motors Motors For Dust Laden Atmosphere
IP 23 For Frame 100-132
High Frequency Motors Brake Motors
MOUNTING REFERENCE As per IS 2253
Textiles Motors Geared Motors
MECHANICAL DIMENSION As per Relevant Dimensional Drawings
POSITION OF TERMINAL BOX RHS viewing From On Top for RHS viewing From RHS viewing 10,12,16,18,24,32 Pole Motors Special Bearings like Thrust Bearings
Driving End For For NDW160M TO Driving End From Driving End Special Performance Requirements Tacho Mounting
D80-ND355L and NDW355LX For C160 For CW160 Class H insulated Motors Non Standard Paint Shade and Painting Procedure for
AD63-AD100L to C315MX to CW315MX required Dry Film Thickness
ARRANGEMENT OF As per relevant Terminal box arrangement drawings
Motors With Service Factor Fabricated Steel Enclosure
TERMINALS
CONNECTION Upto 1.5 KW & 2.2 KW 4-P-STAR Stator: DELTA Upto 1.5 KW & 2.2 KW 4-P-STAR Stator: DELTA Alternate Terminal Box Position
2.2 KW 2/6/8 & above - DELTA Rotor: STAR/DELTA 2.2 KW 2/6/8 & above - DELTA Rotor: STAR Slipring Motors with Bar-wound rotors for Special Shaft Material
Frames 280 to 355
NO. OF LEADS Upto 1.5 KW & 2.2 KW 2/4-P-3 3 LEADS/3 LEADS Upto 1.5 KW & 2.2 KW 2/4-P-3 3 LEADS/3 LEADS Stainless Steel/ Brass Hardware
2.2 KW 6-8 P & above -6 2.2 KW 6-8 P & above -6
Accessories like Resistance Temperature Detectors,
DIRECTION OF ROTATION Bi-directional Bi-directional Bi-directional Bearing Temperature Detectors, Thermocouples, Plug
Except 280,315-2 pole & Socket
ACW from DE
Custom Size Fabricated terminal box & Terminal
GREASE Lithium Soap Base Grade II Arrangements.
Type - Online Greasing arrangement for 250 and above
Canopy
Greasing Arrangement - Grease valve assembly for frame 250 and above on both sides
- Sealed for life bearings Upto 225 frame
BEARING SEAL V- Seal with cap for Frame 160 and above
Oil Seal for Frames 63 to132 M -
VIBRATION LEVEL As per Normal Class of IS12075
NOISE LEVEL As per IS12065
OVERLOAD CAPACITY Capable of withstanding 60% Overload for 15 sec.
OVERSPEED 120% over speed for 2 minutes
PAINT Synthetic Enamel ( Light grey shade 631 as per IS:5 )
POSITION OF SLIPRING On Top Frame 160 and Above
INSPECTION WINDOW On Side Frame 132S /132M

4 5
 MOUNTING ARRANGMENTS DEGREE OF PROTECTION

HORIZONTAL VERTICAL The degree of protection as classified in IS:4691 is given below. It is denoted by two
digits. The first digit denotes protection against solid bodies or particles and the
second digit denotes protection against liquid. All our standard TEFC motors have
degree of protection IP 55, unless otherwise specified.
FIGURE FIGURE

REF B3 B5 REF V1 V5 Second

Characteristic
FRAME WITH FEET WITHOUT FEET FRAME WITHOUT FEET WITH FEET Numeral
SHAFT HORIZONTAL HORIZONTAL SHAFT FACE VERT. DOWN FACE VERT. DOWN

MTNG BASE OR RAILS FLANGE TYPE D MTNG FLANGE TYPE D BASE OR RAILS Water falling Water falling up Water falling upto
First No Water splashes Water projected Water from
to 15º from
Vertically shall 60º from vertical by nozzle heavy seas shall
Characteristic Protection vertical shall shall not harm
not harm shall not harm shall not harm not harm
Numeral not harm
FIGURE 0 1 2 3 4 5 6

REF B35 B14 REF V15 V3 No

0
FRAME WITH FEET & WITHOUT FEET
Protection
FRAME WITH FEET WITHOUT FEET
FLANGE
SHAFT HORIZONTAL HORIZONTAL SHAFT FACE VERT. DOWN FACE VERT. UP
MTNG BASE OR FLANGE TYPE C MTNG WALL OR FLANGE FLANGE TYPE D
FLANGE TYPE D TYPE D Special
Protection
1 against
FIGURE bodies 50
mm dia.

REF B34 B6 REF V36 V6 DP

FRAME WITH FEET WITH FEET protection
FRAME WITH FEET WITH FEET
2 against IP 21 IP 22 IP 23
SHAFT HORIZONTAL HORIZONTAL SHAFT FACE VERT. UP FACE VERT. UP
bodies 12
MTNG BASE OR WALL MTNG WALL OR FLANGE BASE OR RAILS
FLANGE TYPE C TYPE D mm dia

TEFC
FIGURE Protection
4 against IP 44
bodies
REF B7 B8 REF V18 V19 1 mm dia
FRAME WITH FEET WITH FEET FRAME WITHOUT FEET WITHOUT FEET

SHAFT HORIZONTAL HORIZONTAL SHAFT FACE VERT. DOWN FACE VERT. UP

TEFC
MTNG WALL CEILING MTNG FLANGE TYPE C FLANGE TYPE C
Protection
5 IP 54 IP 55 IP 56
* For installation of foot mounted motor on the wall, REFERENCE : IS 2253 against
additional support must be provided. powder

6 7
 NOISE LEVEL DERIVED VALUES OF VIBRATION SEVERITY IN ROTATING ELECTRICAL MACHINE MEASURED
IN STATE OF FREE SUSPENSION*
The noise level of the motors is restricted to the levels specified in
IS : 12065. Table below gives the noise level as per IS : 12065
Limiting Mean Sound Power Level Lw in dB (A) for Airborne noise SHAFT
emitted by Rotating Electrical Machines. HEIGHT 56 TO 132 160 TO 225 Above 225
H, mm
Pole 8 6 4 2 10 8 6 4 2 10 8 6 4 2
Protective IP IP IP IP IP IP IP IP IP` IP IP IP
Enclosure 21 44 21 44 21 44 21 44 21 44 21 44 Syn. Speed, rpm. 750 1000 1500 3000 600 750 1000 1500 3000 600 750 1000 1500 3000
Rating kW Class of vibration severity RMS Value of Vibration Velocity, microns
Rated Speed (rev. /min.)
(or kVA)
Normal 64 48 32 16 80 64 48 32 25 125 100 75 50 42
960 & below 961 to 1320 1321 to 1900 1901 to 2360 2361 to 3150 3151 to 3750
Above Upto Sound Power Level dB (A) Precision A 24 18 12 6 30 24 18 12 10 - - - - -
- 1.1 - 76 - 79 - 80 - 83 - 84 - 88
1.1 2.2 - 79 - 80 - 83 - 87 - 89 - 91 Precision B 16 12 8 4 20 16 12 8 6 - - - - -
2.2 5.5 - 82 - 84 - 87 - 92 - 93 - 95 Precision C 10 8 5 2.5 13 10 8 5 4 - - - - -
5.5 11 82 85 85 88 88 91 91 96 94 97 97 100
11 22 86 89 89 93 92 96 94 98 97 101 100 103
22 37 89 91 92 95 94 97 96 100 99 103 102 105 *The vibration may be determined in rigid mounting condition but the values of vibration severity shall be agreed
37 55 90 92 94 97 97 99 99 103 101 105 104 107 between the manufacturer and the user.
55 110 94 96 97 101 100 104 102 105 104 107 106 109
110 220 98 100 100 104 103 106 105 108 107 110 108 112
220 630 100 102 104 106 106 109 107 111 108 112 110 114
Note 1: IP 21 corresponds generally to drip proof open ventilated & similar enclosures.
IP 44 corresponds generally to totally enclosed fan-cooled, closed air circuit air-cooled & similar enclosure (see IS-4691)

VIBRATION.
The motor is said to be in state of vibration if any part of it experiences displacement in any direction. Standard motors
comply with normal class of vibration severity as per IS 12075. “ Measurement & evaluation of vibration of Rotating
Electrical Machines”. The limits of vibration levels are given below.

VIBRATION LEVELS
LIMITS OF VIBRATION SEVERITY IN ROTATING ELECTRICAL MACHINES
MEASURED IN STATE OF FREE SUSPENSION *

Shaft height H, mm 56 to 132 160 to 225 Above 225

Range of speed (Rpm) 600 to 1500 Above 1500 600 to 1500 Above 1500 600 to 1500 Above 1500
& Upto 3000 & Upto 3000 & Upto 3000
Class of vibration Severity RMS Value of Vibration Velocity, mm/s
Normal 1.8 1.8 1.8 2.8 2.8 4.5
Precision A 0.71 0.71 0.71 1.12 - -
Precision B 0.45 0.45 0.45 0.71 - -
Precision C 0.28 0.28 0.28 0.45 - -

* The vibration may be determined in rigid mounting condition but the value of vibration severity shall be agreed by a
special agreement between the manufacturer & the user.

8 9
 MECHANICAL
FEATURES

MECHANICAL FEATURES The overhangs of SR rotors are banded with FRAME BRUSH SIZE = t x a RECOMMENDED FORCE/BRUSH
resi-glass tape under controlled tension, to
GENERAL prevent flaring under centrifugal force 112-132 8 x 12.5 sq.mm 200gms. - 250gms.
ENCLOSURE caused by over speed. 160-200 16 x 24 sq.mm 200gms. - 250gms.
Frames 63 to 100 L with prefixes AD are of
diecast aluminum. Foot mounted stators ROTOR 225-250 16 x 20 sq. mm 650gms. - 800gms.
have integral feet. TEFC & TE motors have The rotor of SCR motors are made of 280-315 20 x 40 sq. mm 1600gms. - 2000gms.
integral longitudinal ribs for effective heat pressure diecast aluminum (or alloy in case
transfer. Specially designed roller table of special designs) up to frame ND355L.
SHAFT
motors for steel plants have circular ribs to Rotors of specific polarity are made of
The shaft is made of C40 (EN8) steel. Shaft
avoid deposition of dust & slags between the electrolytic copper & copper alloy bars &
bars above 50mm diameter are ultrasonically
ribs. rings connected by high quality silver
tested for detection of flaws, before taken up
brazing.
The stator & end shields are machined to for machining. Shaft made of special steel
close tolerances for providing perfect The rotors of SR (slipring) motors are wound (i.e.EN24, EN57 or stainless steel grades) are
alignment & fits. with copper wire or strip. (See in winding and also available on demand to suit the
insulation) requirement of application.
Terminal boxes of frames up to 132M are of
diecast aluminum alloy. Frame 160 & above
SLIPRING AND BRUSHGEAR
have cast iron terminal box. All joints in
SR motors are provided with slipring and MAXIMUM PERMISSIBLE RADIAL PULL MINIMUM DIAMETER AND MAXIMUM FACE WIDTH
terminal box are sealed with gaskets.
brush gear arrangement. The Sliprings are KG. AT THE CENTRE OF SHAFT OF PULLEY IN mm
Motors above frame 160 have drain holes at
moulded in epoxy-based insulation and have EXTENSION (INCLUDING PULLEY WEIGHT)
their lowest position as a standard features.
excellent stability at high temperature and
have very good anti tracking property. SYNC. SYNC. 1500 and
CORE
Fabricated Sliprings as per Steel Plant's RPM 3000 1500 1000 750 RPM 3000 BELOW
Both stator and rotor cores are made of
specification (IPSS) are also available on
high quality magnetic steel FRAME FRAME PULLEY DIA FACE WIDTH
request for frames 160 & above.
63 42 46 - - 63 75 75 30
WINDINGS 3 Nos. brush holders with 2 nos each metal
Stator and rotor (for SR motors) windings graphite carbon brushes are provided- one 71 46 55 - - 71 75 75 40
consists of modified polyester enamel on each ring phase. The grade of carbon 80 53 66 76 - 80 75 75 50
covered copper wire. Frame 280 and above brush is M15E of Assam carbon or 90 46 57 66 72 90 75 75 63
are wound with dual coat copper wire as per equivalent. Each carbon brush is marked
100 66 83 96 106 100 75 75 80
IS: 13730-13. Motors wound with double with its grade and the line of wear, which
glass covered conductors are also available helps in identifying replacement need. 112 95 120 138 153 112 100 100 100
on order for frame 160 and above only. 132 137 173 198 218 132 120 120 125
The brush holders are made of brass. For
160 to 200, self tension adjustment brush 160 255 305 305 305 160 120 180 177
INSULATION
holders are used . Frames 225 and above 180 300 380 395 395 180 125 200 203
All motors are made with class F insulation as
have adjustable arms to suit the range of
a standard feature. 200 400 505 580 580 200 130 220 280
slipring diameter. This always facilitates
angular adjustment of arms for radial 225 450 570 655 655 225 170 260 330
The slot liners are either provided with
placement of brushes even after reduction in 250 510 1095 1095 1095 250 180 220 380
double cuffing or edge binding at the slot
diameter of slipring, resulting out of any
mouth portion to strengthen the insulation. 280 510 1790 1790 1790 280 300 220 380
rework carried out in service. The brush
For frame 160 & above class F varnish or 315 560 1905 1905 1905 315 500 420 380
tension is adjustable with the help of
resin with vacuum pressure impregnation is
adjustable nuts provided on the brush arm. 355 590 2000 2000 2100 355 600 450 400
used for impregnating the winding.
The sizes of brush and recommended force
Epoxy gel coat is sprayed on all winding for all frames are as given in the table:
overhangs (in frames 200 and above) to
provide mechanical rigidity to the winding to
withstand the electrical and mechanical
stresses.
Surge testing is carried out on all windings in
addition to all other tests ensuring
healthiness of windings.

10 11
MAXIMUM PERMISSIBLE AXIAL THRUST IN KG. CONSIDERING EXTERNAL RADIAL THRUST TO BE ABSENT BEARING LIFE: The minimum L10 life of bearings for standard motors is 40000 hours subject to operations under
conditions of maximum permissible radial thrust, axial thrust and minimum diameter and maximum face width of pully.
SYNC. 3000 1500 1000 750
RPM
FRAME HORIZONTAL VERTICAL HORIZONTAL VERTICAL HORIZONTAL VERTICAL HORIZONTAL VERTICAL
DOWNWARDS DOWNWARDS DOWNWARDS DOWNWARDS THREADED CENTERED HOLES FOR MOTOR SHAFT
63 18 24 30 40 - - - -
71 21 28 36 48 - - - -
80 35 33 43 40 50 48 - -
90 30 27 38 33 43 38 48 43
100 42 37 53 47 60 54 67 61
112 60 53 75 67 87 79 96 88
d3 d 4
132 88 75 110 94 127 109 140 122
160 170 140 225 208 265 245 300 280
180 195 160 260 230 310 280 345 320
t4
200 260 210 340 270 410 360 480 420
t3
225 285 230 380 325 455 380 515 440 t1
250 325 250 470 290 555 390 360 480 t2
280 325 220 580 350 680 440 765 520
315 355 280 610 320 730 430 810 540
355 385 310 640 390 760 460 850 580

NOTE: For radial or Axial thrust exceeding the values given in above table, please refer to works. +2
Diameter Thread d3 d4 t1 -0 t2 (min) t3 t4
Range 'D' d
7 to 10 M3 3.2 5.3 9 13 2.6 1.8
10 to 13 M4 4.3 6.7 10 14 3.2 2.1
13 to 16 M5 5.3 8.1 12.5 17 4 2.4
16 to 21 M6 6.4 9.6 16 21 5 2.8
21 to 24 M8 8.4 12.2 19 25 6 3.3
24 to 30 M10 10.5 14.9 22 30 7.5 3.8
30 to 38 M12 13 18.1 28 37.5 9.5 4.4
38 to 50 M16 17 23 36 45 12 5.2
50 to 85 M20 21 28.4 42 53 15 6.4
85 to 130 M24 25 34.2 50 63 18 8

Dimensions are as per DIN 332 part 2 and are in mm.

12 13
BEARING REFERENCE AND LUBRICATION INTERVALS Bearings are common for CAST IRON and
ALUMINIUM body motors upto frame size
BEARING AND LUBRICATION : Motors above frame 250 are provided with deep groove ball Bearings with on line 100L/LX.
greasing arrangement. Motors upto frame 225 are provided with sealed ball * For single shaft extension. For double
bearings. A guideline for relubrication is available in the chart given below. shaft extension-Bearing Size-
6208/6208.
GREASE : Lithium Base Grease grade II
GREASE QUANTITY Complete space between rolling elements of bearings and half of the Space inside Bearings are common for SR and SCR
and outside of bearing cover to be filled by grease. 4 pole up wherever not mentioned.
Bearing clearance-
GREASE EXPIRY DATE : Ensure that grease is used before the expiry date as stated by the Manufacturer.
RELUBRICATION CHART (IN HOURS) Motors upto 132M have normal
clearance bearings.
FRAME SIZE DE BRG NDE BRG Interval For Relubrication In Hours For Respective Syn. Speed
Motors in Frame 160 & above have
2 POLE 4 POLE 6 POLE 8 POLE 10/12POLE C3 clearance Bearings.
AD63 6201ZZ 6201ZZ -- -- -- -- --
@ For single shaft extension only.
AD71 6203ZZ 6203ZZ -- -- -- -- --
AD/D80 6204ZZ 6204ZZ -- -- -- -- --
ND/D90S/L 6205ZZ 6205ZZ -- -- -- -- --
ND/NC100L/LX 6206ZZ 6205ZZ -- -- -- -- --
ND112M@ 6306ZZ 6205ZZ -- -- -- -- --
ND112MX/NC112M 6206ZZ 6205ZZ -- -- -- -- --
ND 132 S/M 6308ZZ 6208ZZ -- -- -- -- --
DW132S/M(SR)* 6208ZZ 6307ZZ -- -- -- -- --
ND160M/L 6309 2RS 6309 2RS -- -- -- -- --
ND180M/L 6310 2RS 6310 2RS -- -- -- -- --
ND200L 6312 2RS 6312 2RS -- -- -- -- --
ND225S/M 6313 2RS 6313 2RS -- -- -- -- --
ND250 S/M 2POLE 6314 6314 2500 -- -- -- --
ND250M S/M 4P & UP 6314 6314 -- 3500 5000 7750 10500
ND280S/M 2P POLE 6314 6314 2500 -- -- -- --
ND280S/M 4P & UP 6318 6318 -- 2900 4750 7250 9500
ND315S/M/L-2 POLE 6315 6315 2300 -- -- -- --
ND315S/M/L 4P & UP 6319 6319 -- 2500 4500 7000 9000
ND355 S/M/L 2P 6315 6315 2300 -- -- -- --
ND355S/M/L 4P & UP 6321 6321 -- 2500 4500 7000 9000
ND355LX 4P & UP 6322 6322 1000 2500 4500 7000 9000
C160M/L 6310 2RS 6310 2RS -- -- -- -- --
C180M/L 6312 2RS 6312 2RS -- -- -- -- --
C200M/L 6313 2RS 6313 2RS -- -- -- -- --
C225S/M 6314 6314 2500 7800 12800 18000 23000
C250S/M-2 POLE 6314 6314 2500 -- -- -- --
C250S/M-4P & UP NU316 6316 -- 3500 5000 7750 10500
C280S/M-2 POLE 6314 6314 2500 -- -- -- --
C280S/M/MX-4P & UP NU318 6318 -- 2900 4750 7250 9500
C315S/M/MX-2 POLE 6315 6315 2300 -- -- -- --
C315S/M/MX-4P & UP NU319 6319 -- 2500 4500 7000 9000

14 15
 ELECTRICAL FEATURES

TERMINAL BOX For aluminum Frames (AD63 to AD100L), CABLE GLANDS is to be specified at the time of ordering.
terminal box is on top. For ND 132 to ND 355 Motors may be provided with arrow plate to
Terminal boxes of all motors are rotatable in Standard TEFC & DP motors are provided
frames, terminal box can also be provided on indicate direction of rotation.
steps of 90° except aluminum body motor in with threaded cable entry. These holes are
80 frame. This feature has been incorporated top, on request. plugged with PVC plugs. On request, double Starting Methods And Torque
in order to facilitate cable entry from any For motors rated upto and including 2.2.kW compression type cable glands (made of DOL Starting: Direct connection to the
direction. However, terminal boxes which are (3HP) 2pole/4pole are provided with 3 nickel plated brass) can be fitted on terminal mains is the simplest method of starting for
fitted with trifurcating box (frame 225 & terminals. For 2.2.kW (3HP) 6pole/8pole box. The type of cable & its size in that case is squirrel cage motors. Normally, motors
above) would need sufficient space and 3 kW and above are provided with 6 required to be mentioned at the order stage Upto 2.2 Kw are started DOL, However all
underneath, for cable entry from bottom, as terminals as a standard practice. The itself. our motors are capable of starting on DOL.
the trifurcating box ends below the level of terminal markings U, V, W or U1, V1, W1, & Star-Delta Starting The current impulse
motor feet. For cast iron body motors (Frame U2, V2, W2 are provided on the motor lead FINISH: caused during the DOL starting of motors of
80 132 M), sufficient space is to be provided sockets. All castings and M .S. components are higher ratings, lead to the drop in the voltage
below the terminal box where cable entry is Standard motors in frame 160 & above are provided with red oxide primer and of the system. In such cases the motors are
to be provided from bottom. provided with double decker terminal block aluminum components with zinc chromate generally started by means of star-delta
The terminal box provided for standard for easy termination of two cables for primer. The motors are finally painted with starters, wherein the motor terminals get
motors is of die cast aluminum alloy or of cast Star/Delta starting. synthetic enamel paint of shade-Light gray connected in star at the time of starting
iron. The degree of protection provided is Cable trifurcating box is provided in Frames 631 as per IS : 5 thereby reducing the starting current. When
IP55. The detailed dimensions of terminal 225 & above. the motor is accelerated to nearly 70 % of full
For the motors required to operate in acidic
box are given in the drawings included in the Antirotating socket arrangement is a speed, the connections at the motor
and alkaline or any other corrosive
catalogue. As a standard practice, for cast standard feature in frame 225 & above. terminals are changed to delta, for the normal
atmosphere, the motor components are
iron body motors , the terminal box is Clearance & creepage distances in the running of the motor on load SR Motors are
suitably treated to withstand corrosion due to
provided on the right hand side, when viewed terminal box for Frames 63 to 132 M are as started with SR starters having resistance
such atmosphere and are then painted with
from driving end. When required, terminal per BS : 4999 part 145. For frames 160 & banks matching with rotor current of the
Epoxy Base paint of colour Light Grey shade
box can be provided on left hand side when above, distances are as per IS: 6381. motor. Star connected motor can have only
631 as per IS 5. Any other shade can be given
viewed from driving end. on request. DOL starting.

ELECTRICAL FEATURES
TEFC DP MAXIMUM CABLE SIZE NO. OF TERMINAL BSC Direction of Rotation
FRAME FRAME MAIN STUD SIZE ENTRY Motors are capable of rotating in either
DOL STAR/DELTA TERMINALS MAIN EARTH NOS. SIZE direction except in 280/315 SPDP Frame 2
AD63-AD71 - 4Cx4mm2 - 3 M5 M4 1 ¾” pole motors. To reverse the direction of
AD80 * - 4Cx4mm2 - 3 M5 M4 2 ¾” rotation, interchanges any of two-phase
D80 - 4Cx4mm2 - 3 M5 M4 1 ¾” connection. For 2 pole motors in
D90S/L - 4Cx10mm2 - 3 M6 M5 1 ¾” 280/315SPDP frame the direction of rotation
ND90S-ND132M - 4Cx10mm2 4Cx10mm2 #6 M6 M5 DOL-1, S/D-2 1”
AD90S-AD100L - 4Cx10mm2 - 3 M6 M5 1 1”
NC100L-NC132M - 4Cx10mm2 4Cx10mm2 6 M6 M5 DOL-1, S/D-2 1" Operating data for the motors being run by star-delta starters.
ND160-ND200 C160&C180 3Cx50mm2 2x3Cx35mm2 6 M6 M8 2 1” Operating Data Starting on star Running on Delta
ND225-ND280 C200 - 3Cx120mm2 2X3C X95mm2 6 M8 M12 for ND250 2 1 ½”
C250 & ND280 Supply Voltage 415 415
M8 for others Voltage across each phase of 230 415
ND315S/M/L C280- 3Cx400mm2 2x3Cx300 mm2 6 M12 M12 2 2" winding
C315S/M/MX
ND355L/LX --- 3Cx400 mm² 2x3Cx300 mm² 6 M16 M12 2 2.5” Current in supply cable 1/√3 1
Current in phase winding 1/√3 1/√3
Breakaway Torque (starting Torque) 1/3 of STT. When started on DOL ---------
Locked rotor current (starting current) 1/3 Isc when started on DOL

* INTEGRAL TERMINAL BOX

# 3 Leads upto 2.2 kW2 P/4P & 1.5 Kw 6P/8P and below
6 leads for 2.2 kW 6p/8p & above

16 17
Permissible No of starts: 2 hot or 3 cold in succession or 4 equally spaced starts.
The number of starts takes into account: -Complete starts, inching & plug reversal on the following basis. DUTY the operating and rest and de-energized
th The various operating cycles of driven being too short to attain thermal equilibrium
One inching (an incomplete start in which Equivalent to 1/4 start. during one duty cycle. In this duty the
motor speed do not cross 25% of rated speed) machines can be classified into nine basic
duties, ranging from S1 to S9 separately stopping of the motor is obtained either by
In case of SR motors: One plug braking Equivalent to 80% of one start indicated in the following pages. Suitable natural decelaration after disconnection of
(Reversal of any two phases till motor motors can be offered to match the duty the electricity supply or by means of braking
reaches standstill) cycles of the driven machines. such a mechanical brake which does not
cause additional heating of the windings
In case of SR motors: One plug reversal two Equivalent to 1.8 starts. CLASSES OF DUTY
(reversal of any phases, till motor picks up full Intermittent periodic duty with Electric
The following are the duty types: braking (Duty type S5)
speed in reverse direction)
S1 Continuous running duty
In case of SCR motors Equivalent to 3 starts. A sequence of identical duty cycles, each
S2 Short time duty
One plug braking consisting of a period of starting, a period of
S3 Intermittent periodic duty operation at constant load, a period of
One DC injection braking Equivalent to 2 starts. S4 Intermittent periodic duty with starting braking and a rest period. The operating and
One plug reversal Equivalent to 4 starts. S5 Intermittent periodic duty with Electric de-energized periods being too short to
braking obtain thermal equilibrium during one duty
Motors required with higher starting i.e. (6,90,150,300,600 starts /hr) are suitable for intermittent periodic duties cycle
S6 Continuous operation periodic duty
S7 Continuous operation periodic duty with In this duty braking is rapid and is carried out
INSULATION CLASS electrically.
Electric braking
Standard Motors are provided with windings Continuous operation periodic duty
S8 Continuous operation periodic duty with
having class “F” Insulation with maximum (Duty type S6)
related load/ speed changes
permissible temperature rise limited to class
“B” insulation level. On request , motors are S9 Duty with Non-periodic load & speed A sequence of identical duty cycles, each
provided with Class “H” insulation. variations. consisting of a period of operation at
constant load and a period of operation at
Table showing maximum temperature rise at Continuous running duty (Duty type S1) no-load, machines with excited windings
various ambient and the * Hot spot Operation at constant load of sufficient having normal no load rated voltage
temperature for the insulation system is duration till thermal equilibrium is reached. excitation. The operation and no-load
given below:
periods are too short to attain thermal
Short Time Duty (Duty type S2)
equilibrium during one duty cycle
Operation at constant load during a given
Class of Max. * Hot Spot Max. Permissible Temperature Rise for windings at Ambient of (°C) time, less than that required to reach thermal Unless otherwise specified the duration of
Insulation Permissible Allowance equilibrium, followed by a rest of sufficient the duty cycle is 10 minutes.
Temp. (°C) duration to re-establish equality of Continuous operation periodic duty with
Limit (°C) 40 45 50 55 60 temperature with the cooling medium. Electric braking (Duty type S7)
B 130 10 80 75 70 65 60 The recommended values for the short time A sequence of identical duty cycles each
duty are 10,30,60 and 90 minutes. consisting of a period of starting, a period of
F 155 15 100 95 90 85 80
Intermittent Periodic Duty (Duty type S3) operation at constant load and a period of
H 180 15 125 120 115 110 105 electrical braking. There is no rest and de-
A sequence of identical duty cycles, each
consisting of a period of operation at energized period.
*Hot spot Allowance is an empirical value EARTHING constant load and a rest period, these Continuous operation periodic duty with
expressed in °C, by which the hottest spot of Earthing pads are provided on the stator for periods being too short to attain thermal related load/ speed changes (Duty Type
winding can exceed the mean temperature all frames. One no. M5 screw is provided on equilibrium during one duty cycle. In this duty S8)
rise of the winding. either side for 63-80 frame Aluminum body type, the starting current does not A sequence of identical duty cycles each
motors. Two numbers of M6 screws and significantly affect the temperature-rise. consists of a period of operation at constant
washers are provided for earthing on motor Unless otherwise specified, the duration of load corresponding to a determined speed
from frame 80 to 132, whereas M8 screws the duty cycle is 10 minutes. The of rotation, followed immediately by a period
and washers are provided for earthing in recommended values for the load factor are of operation of another load corresponding
frame 160 to 225. For Frames 15,25,40 and 60 percent. to a different speed of rotation (carried out,
250,280,315&355 Frames M12 screws are Intermittent Periodic Duty with Starting for example by means of change of the
provided. (Duty type S4) number of poles in the case of induction
A sequence of identical duty cycles, each motors), the operating periods being too
Additional earthing is provided inside the
consisting of a period of starting, a period of short to attain equilibrium during one duty
terminal box (see terminal box details)
operation at constant load and a rest period, cycle. There is no rest and de energized
period.

18 19
APPLICATION OF THE DUTY TYPE, RATED MOTORS DIAGRAMS OF DUTY CYCLES
DUTY APPLICATION
S1 Pumps, blowers, Fans, Compressors
S2 Operation of gates of dams, sirens,
Capstan.
N
N

S3 Valve actuators, Wire drawing machine

S4 Hoists, Cranes, Lifts
S5 Hoists, Cranes, Rolling Mills LOAD
S6 Conveyors, Machine Tools LOAD
S7 Machine Tools
ELECTRIC
S8, S9 Special application where the motor is required to run at ELECTRIC LOSSES
different speeds and different loads. LOSSES MAX.
MAX. TEMP.
S2/S3 DUTY RATED MOTOR OUTPUTS
TEMP.
Standard motors can be used for S2 and S3 duties with increased outputs , however , the TIME
starting torque and pull out torque as percentage of full load torque would be reduced .The
MAX. = MAX. TEMP. ATTAINED DURING
ratings indicated in the table are with minimum 200 % pull out torque. TIME
DUTY CYCLE
MAX. = MAX. TEMP. ATTAINED DURING N = OPERATION AT CONSTANT LOAD
DUTY CYCLE
N = OPERATION AT CONSTANT LOAD

CONTINUOS RUNNING DUTY, SHORT TIME DUTY, DUTY TYTE S2

DUTY TYPE S1
FIG 1 FIG 2

PERIOD OF
ONE CYCLE
PERIOD OF
ONE CYCLE
D N R
N R
LOAD
LOAD

ELECTRIC
ELECTRIC LOSSES
LOSSES
MAX.
TEMP. MAX.
TEMP.
TIME

MAX. = MAX. TEMP. ATTAINED DURING TIME

DUTY CYCLE MAX. = MAX. TEMP. ATTAINED DURING
N = OPERATION AT CONSTANT LOAD DUTY CYCLE
R = AT REST & DE-ENERGISED N = OPERATION AT CONSTANT LOAD
N D = STARTING
CYCLIC DURATION FACTOR = 100% R = AT REST & DE-ENERGISED
N+R
D+N
CYCLIC DURATION FACTOR = 100%
D+N+R
INTERMITTENT PERIODIC DUTY, INTERMITTENT PERIODIC DUTY
DUTY TYPE S3 WITH STARTING, DUTY TYPE S4
FIG 3 FIG 4

20 21
DIAGRAMS OF DUTY CYCLE
DIAGRAMS OF DUTY CYCLES
PERIOD OF PERIOD OF
ONE CYCLE ONE CYCLE
D N F R N R

LOAD
LOAD

ELECTRIC D L F R
ELECTRIC S
LOSSES
LOSSES

TEMP MAX TEMP. MAX SPEED

TIME TIME
D = STARTING
N = OPERATION AT CONSTANT LOAD N = OPERATION AT CONSTANT LOAD SPEED Cp
F = ELECTRIC BRAKING V = OPERATION ON NO LOAD
MAX.= MAX. TEMP. ATTAINED DURING MAX.=MAX. TEMP. ATTAINED DURING THE
THE DUTY CYCLE DUTY CYCLE
R = AT REST AND DE-ENERGIZED
CYCLIC DURATION FACTOR = N
D+N+F 100%
CYCLIC DURATION FACTOR = 100% N+V
D+N+F+R
INTERMITTENT PERIODIC DUTY WITH CONTINUOUS - OPERATION
ELECTRIC BRAKING, DUTY TYPE S5 PERIODIC DUTY, DUTY TYPE S6
FIG.5 FIG.6

ELECTRIC
PERIOD OF LOSSES
ONE CYCLE
PERIOD OF
ONE CYCLE D N 1 F1 F2
D N F N2
N3 MAX
LOAD
LOAD
ELECTRIC TEMP.
LOSSES

ELECTRIC TEMP.
LOSSES MAX TIME
MAX
TEMP.
D = STARTING
D=ACCELERATION
F1, F2=ELECTRIC BRAKING F = ELECTRIC BRAKING
TIME S = OPERATION UNDER OVERLOAD
N1, N2, N3=OPERATION AT CONSTANT LOAD
D = STARTING MAX.=MAX. TEMP. ATTAINED DURING THE DUTY CYCLE MAX = MAXIMUM TEMP. ATTAINED DURING DUTY CYCLE
N = OPERATION AT CONSTANT LOAD
CYCLIC DURATION FACTORS = L = OPERATION UNDER VARIOUS LOADS
F = ELECTRIC BRAKING =
D + N1
100%
R = AT REST AND DE-ENERGISED
D + N1 + F1 + N2 + F2 + N3 Cp = FULL LOAD
MAX.= MAX. TEMP. ATTAINED DURING THE F1 + N2
DUTY CYCLE = 100%
D + N1 + F1 + N2 + F2 + N3
CYCLIC DURATION FACTOR = 1 F2 + N3
= 100%
D + N1 + F1 + N2 + F2 + N3
CONTINUOUS - OPERATION PERIODIC
DUTY WITH ELECTRIC BRAKING, CONTINUOUS - OPERATION PERIODIC
DUTY WITH RELATED LOAD/SPEED
DUTY TYPE S7 CHANGES DUTY, DUTY TYPE S8 DUTY WITH NON - PERIODIC LOAD AND SPEED VARIATIONS
FIG.7 FIG.8 DUTY TYPE S9

22 23
 EFFECT OF VARIATION OF VOLTAGE AND FREQUENCY ON THE CHARACTERISTICS OF MOTOR LOCKED ROTOR CURRENT
(Starting Current)
Characteristics Voltage Frequency This is the current drawn by the motor at
110% 90% 105% 95% the time of starting when started on DOL. It
Torque is expressed as % age of the rated current
Starting & Maximum Increase 21% Decrease 19% Decrease 10% Increase 11% of the motor.
Speed The startng current varies proportionately
Synchronous No Change No Change Increase 5% Decrease 5% with voltage from its rated value within the
permissible limits.
Full Load Increase 1% Decrease 1.5% Increase 5% Decrease 5%
Current
No Load Increase 10-15% Decrease 10-12% Decrease 5-6% Increase 5-6%
Starting Increase 10-12% Decrease 10-12% Decrease 5-6% Increase 5-6%
Full Load Decrease 7% Increase 11% Slight Decrease Slight Increase
Temp. Rise Decrease 3-4% Increase 6-7% Slight Decrease Slight Increase SPEED TORQUE CHARACTERISTICS
Overload Capacity Increase 21% Decrease 19% Slight Decrease Slight Increase
Magnetic Noise Slight Increase Slight Decrease Slight Decrease Slight Increase
Efficiency PULLOUT TORQUE
Full Load Increase 0.5-1.0% Decrease 2% Slight Increase Slight Decrease
Power Factor Decrease 3% Increase 1% Slight Increase Slight Decrease

TORQUE
OVERLOAD
PULL UP
Standard motors are designed to withstand overload up to 1.6 times their rated torque for 15 Seconds without stalling TORQUE
or abrupt change in speed at rated supply conditions.
BREAKAWAY
RATED SPEED / SLIP TORQUE
The rated speed is the speed at which the motor runs with rated load .The slip is the difference between the synchronous FULL LOAD TORQUE
speed and the rated speed of the motor expressed as a percentage of the synchronous speed.
Where synchronous speed Ns=120 x f/p
Where f= frequency of the supply system
And p= No. Of poles
SPEED FULL LOAD SPEED
Normally, for partial loads, slip varies proportionally with output.
RATED CURRENT
It is the current drawn by the motor when running with rated load and the rated supply conditions. The rated current given
in performance data are for 415v supply. For motors designed to suit other voltages, the rated current (approximate) is If the voltage varies from its rated value within
given by the permissible limits, the starting, pull-up
and pull-out torques vary as the square of the
I = (Vr / V ) X Ir voltage.
Where Ir = rated current at rated voltage Vr.
I = rated current at rated voltage V.
The current drawn by a motor varies with the load ,though no linear relationship exists.

24 25
Speed Torque Characteristics LOCKED ROTOR WITHSTAND AND TIME (THERMAL WITHSTAND TIME)
It is the time taken by the motor windings or rotor to reach the maximum limiting temperature, during locked rotor
condition, depending upon class of insulation, from either ambient temperature, or rated service temperature.
Typical Speed Torque characteristics for few applications are shown below: CALCULATION OF LOCKED ROTOR CALCULATION OF LOCKED ROTOR
WITHSTAND TIME FOR STATOR WITHSTAND TIME FOR ROTOR:
Limiting Temperature Limiting Temperature
TORQUE TORQUE TORQUE TORQUE TORQUE 0
Class B Insulation 185 C For normal applications: 450° C
0
Class F Insulation 210 C For hazardous areas, respective temperature class to be considered.
IR=25-50

HAMMERMILL
IR=0.5-1

FLOW PUMP
AXIAL &MIXED

IR=1-5

PULP GRINDER

IR=2-4

AGITATOR
0
Class H Insulation 235 C
Locked rotor withstand time (cold) Locked Rotor Withstand time (cold)

IR=4.5-6

BALL MILL
2
= (Limiting temp. - Amb Temp.) / 0.0065 x 0.85 x j = (Limiting Temp. - Amb. Temp.) / * x 0.85

SPEED
SPEED

SPEED
SPEED

SPEED

Where *= (T st/ Tr) x P2 / (J x W2)

Locked rotor withstand time (hot)
TORQUE TORQUE TORQUE TORQUE = (Limiting temp. - Max. Permissible Temp.) /(0.0065 x 0.85x j2) Tst/ Tr = Starting torque to full load torque ratio
TORQUE
P2 = Specific heat of rotor conductors in Joules/kg / 0C
IR=0.5-2
BLOWER
CENTRIFUGAL

W2 = Weight of rotor conductors in kg.

IR=2-10

DISPLACEMENT)ROTARY
BLOWERS(POSITIVE

IR=3-60

PUMP
PUMP AND VACCUM
RECIPROCATIVE
IR=1-2

IR=0.5-10

J = Starting current density

SCREW PUMP
PUMP
CENTRIFUGAL
SPEED

SPEED

SPEED

Locked Rotor withstand time (hot)

SPEED

SPEED

Where j= Starting Current Density = (Limiting temp.- permissible rotor temp.) / * x 0.85
& Max. Permissible Temp.
TORQUE TORQUE TORQUE TORQUE TORQUE
= 1200 C for Class B Insulation
0
= 140 C for Class F Insulation
IR=1-10

COMPRESSOR
RECIPROCATING

IR=2

COMPRESSOR
ROTARY

IR=2

COMPRESSOR
SCREW

IR=2-25

COMPRESSOR
CENTRIFUGAL
IR=1-5

CONVEYOR

0
= 165 C for Class H Insulation

Starting Time
SPEED

It is the time taken by a motor to come to its rated speed, when connected to load.
SPEED

SPEED
SPEED

SPEED

Starting time depends upon:

2 2
I. Total Inertia of the system i.e. GD of load referred to motor shaft speed plus motor GD .
ii. Torque speed curve of the motor.
TORQUE TORQUE TORQUE TORQUE iii. Torque speed curve of the load
Starting time should be lower than thermal withstand time for safe operation of the motor
IR=INERTIA RATIO
IR=0.5-2

RE-ROLLING MILL

IR=20-100

(EXTRACTOR)

IR=2

CRUSHER
CONE
IR=2-50

CRUSHER
ROLL/JAM

CENTRIFUGE

Calculation of starting time

The starting time can be calculated approximately by the following formulae
2
K x Total GD
ta =
SPEED
SPEED

SPEED

Output x (K1-K2)
SPEED

Where ta = acceleration time (starting time) in secs.

K = 24.66 for 2 pole (3000 synchronous RPM)
= 6.165 for 4 pole (1500 synchronous RPM)
Note: These characteristics are exemplary and the values of Torque, Inertia Ratio etc. are = 2.74 for 6 pole (1000 synchronous RPM)
given based on experience of normal applications. These values should be verified in = 1.541 for 8 pole (750 synchronous RPM)
2 2 2 2
actual before framing any reference. Total GD = GD of motor + GD of load in kgm

26 27
Output = Output of motor in kw ACCESSORIES the resistance causes the relay to open and the
When required, the accessories which are contactor to disconnect the motor supply, # The
Breakaway torque leads of thermistors are terminated in the auxiliary
K1= provided with a motor, are thermistors, space
heaters, sockets for customer's cable etc. terminal box for frames 200 & above.
Full load torque
compression glands; RTD and BTD for 280/315 # For frame AD 63 to AD 100L and D80 the
Load torque motors. thermistors terminals are brought on the same
K2 = terminal block as that of main windings.
Full load torque THERMISTORS
SPACE HEATERS
=0.3 for fans, blowers, pumps These are semi conductor devices, which have a
These are provided over the windings of the motor
=1.0 for other applications liker cranes, hoists, conveyors. property of suddenly changing their resistance at
.The main function of heaters, is to heat the
a definite temperature known as 'curie point'.
windings when motor is in idle condition or kept in
Thermistors that may be provided on the motors
The starting time can be more accurately determined by knowing the load torque speed are those having 'Positive Temperature
storage , in order to prevent moisture or dew
curve and superimposing it on the motor torque speed curve. settling over the windings and thereby reducing
Coefficient' (PTC); where the resistance suddenly
the insulation resistance CAUTION-Supply to the
increases at a 'Curie Point'. The thermistors
Example generally provided are at 130°c (PTC 130) for
heaters must be switched off before switching on
the motor. The motors are provided with space
Consider a 2.2 KW 6 pole motor in frame 112 M for driving centrifugal fan. Class B temperature rise, 150°C (PTC 150) For
heaters of ratings 25w, 40w, 50w, or 60w 240 V
Motor GD2 = 0.048 kgm2 load GD2 = 4.0 kgm2 class F motors.
single phase depending on the frame size. Like
Breakaway Torque of the motor =2.0 full load torque A combination of different ratings of thermistors thermistors the space heater leads are also
The starting time would then be calculated as follows: can be provided in same motor for 'Alarm & Trip' brought in the main terminal box up to frame 180
2 facilities for frame 160 and above only. and in a separate auxiliary terminal box for frames
K x Total GD
200 and above.
ta = MODE OF OPERATION
Output (KW) x (K1-K2) Three thermistors connected in series are placed GUIDE FOR MOTOR PROTECTION-
inside each of the phase windings of the motor. FUSE RATINGS
2.74 X (0.048 + 4.0) This gives protections against single phasing and
= /or over heating due to excess load on the motor. In addition to the starters (DOL or Star / Delta)
2.2 X (2.0- 0.3) being used to protect motors from overload and
During normal operation the thermistors carry a under voltage, the motors are also to be provided
current of few mA, which is sufficient to actuate a with back up fuse protections of suitable ratings.
= 2.895, say 2.9 seconds. relay in control unit. This in turn allows the The table below gives general guidelines for
contactor operating coil to hold the starter in the selection of the fuse ratings.
'Run position. If the winding of the motor heats up
to such an extent so as to bring the temperature of
the thermistors up to 'Curie point'. The increase in
GENERAL TOLERANCES ON ELECTRICAL PERFORMANCE (AS PER IS 325)

SR. ITEM TOLERENCE

NO.
1. EFFICIENCY
a. By summation of losses
Motors Upto 50 kw - 15 percent of (1-EFF)
Motors above 50 kw - 10 percent of (1-EFF)
b. By input output test - 15 percent of (1-EFF)
2. Power factor -1/6 of (1-cosφ ) min 0.02
and max 0.07
3. Slip at full load and working temp. +20 percent of guaranteed Slip.
4. Breakaway starting current of SCR induction motors with +20 percent of the guaranteed
short-circuited rotor and with any specified starting apparatus. Starting current (no lower limit)
5. Breakaway torque -15 percent to +25 proper cent of the guaranteed torque
(+25 percent may be exceeded by agreement)
6. Pull out torque -10percent of the guaranteed torque
except that after allowing for this
tolerance the torque shall not be less
than 1.6 to 1.5 times the rated torque

28 29
 POWER FACTOR IMPROVEMENT CHART

32-63 50-90 50-90 70-110 90-135 140-170

125

156

250
Ratings of capacitors in KVAR required for given degree of power factor correction per kW of load
90 INITIAL POWER FACTOR V/S KVAR OF CAPACITOR

100

131

200
75

Initial Correction to
Power
Factor 0.85 0.90 0.95 0.98 Unity

160
55

75

96
0.50 1.112 1.248 1.403 1.529 1.732
0.51 1.066 1.202 1.357 1.483 1.686

160

132

180

220

127

250
45

60

78

0.52 1.024 1.160 1.315 1.441 1.644

0.53 0.980 1.116 1.271 1.397 1.600
100

110

150

185

107

200
37

50

65

0.54 0.939 1.075 1.230 1.356 1.559

In addition to the starters (DOL or Star / Delta) being used to protect motors from overload and under voltage, the motors are also to be

50-90 70-110 90-135 140-170

0.55 0.899 1.035 1.190 1.316 1.519
100

125

156

200
30

40

53

90

88
0.56 0.860 0.996 1.151 1.277 1.480
provided with back up fuse protections of suitable ratings. The table below gives general guidelines for selection of the fuse ratings.

0.57 0.822 0.958 1.113 1.239 1.442

32-63

100

137

160
0.58 0.785 0.921 1.076 1.202 1.405
26

35

47

80

75

74
0.59 0.748 0.884 1.039 1.165 1.368
0.60 0.714 0.849 1.005 1.131 1.334
24-45 24-45

54.5

125
22

30

39

63

55

75

96
0.61 0.679 0.815 0.970 1.096 1.299
0.62 0.645 0.781 0.936 1.062 1.265
18.5

46.4

100
25

33

63

45

60

78
0.63 0.613 0.749 0.904 1.030 1.233
0.64 0.580 0.716 0.871 0.997 1.200
16-32

50-90
37.5
0.65 0.549 0.685 0.840 0.966 1.169
15

20

27

50

37

50

65

80
STAR DELTA STARTING OF MOTORS

0.66 0.518 0.654 0.809 0.935 1.138

D.O.L STARTING OF MOTORS

0.67 0.488 0.624 0.779 0.905 1.108

18-24

32-63
32/35

30.6
11

15

21

30

40

53

63
0.68 0.459 0.595 0.750 0.876 1.079
0.69 0.429 0.565 0.720 0.840 1.049
18-24

32-63
32/35
12.5

26.9

0.70 0.400 0.536 0.691 0.811 1.020

9.3

18

26

35

47

63 0.71 0.372 0.508 0.663 0.783 0.992

6-12 10-16

6-12 10-16 18-24 18-24 16-32 24-45 24-45

0.72 0.343 0.479 0.634 0.754 0.963

23.2
7.5

10

15

25

22

30

39

63

0.73 0.316 0.452 0.607 0.727 0.936

0.74 0.289 0.425 0.580 0.700 0.909
11.2

18.5

20.2
5.5

7.5

25

25

33

50

0.75 0.263 0.398 0.553 0.673 0.882

0.76 0.235 0.371 0.526 0.652 0.855
6-12

16.8
GUIDE FOR MOTOR PROTECTION- FUSE RATINGS

3.7

5.0

7.8

16

15

20

27

50

0.77 0.209 0.345 0.500 0.620 0.829

0.78 0.183 0.319 0.473 0.594 0.803
12.7
3-6
2.2

3.0

4.8

16

11

15

21

25

0.79 0.156 0.292 0.447 0.567 0.776

0.80 0.130 0.266 0.421 0.541 0.750
12.5
2-4
1.5

2.0

3.7

9.3
10

18

11

25

0.81 0.104 0.240 0.395 0.515 0.724

0.82 0.078 0.214 0.369 0.489 0.698
1.5-3
1.1

1.5

2.6

7.5

10

15

25
6

0.83 0.052 0.188 0.343 0.463 0.672

0.84 0.026 0.162 0.317 0.437 0.645
BACK-UP FUSE SELECTION CHART

0.75

11.2
1-2
1.0

1.9

5.5

7.5

6.5

16
6

0.85 - 0.136 0.291 0.417 0.620

0.86 - 0.109 0.264 0.390 0.593
6-12
0.55

0.75

1-2
1.3

3.7

5.0

7.8

4.5

16

0.87 - 0.083 0.238 0.364 0.567

6

* Average value for 6 & 8 pole motors

0.88 - 0.054 0.209 0.335 0.538

0.5-1
0.37

0.89 - 0.028 0.183 0.309 0.512

3-6
0.5

1.0

2.2

3.0

4.8

2.8

10
4

0.90 - - 0.155 0.281 0.484

KW

KW
HP

HP
A

Example: Initial Power Factor: 0.76

FULL LOAD PHASE

Correction Desired: 0.9

OVERLOAD RELAY

OVERLOAD RELAY
FULL LOAD LINE
MOTOR OUTPUT

MOTOR OUTPUT
RECOMMENDED

RECOMMENDED

Capacitor KVAR required per KW load from chart: 0.371

FUSE RATING
PROTECTION

PROTECTION
USE RATING

CURRENT*
CURRENT*

Load (e.g. from meter reading): 140KW

FULLLOAD
CURRENT

BACKUP

BACKUP

Capacitor KVAR required: 0.37x140 =51.8 KVAR =50 KVAR.

RANGE

RANGE

30 31
TEFC MOTORS THERMAL WITHSTAND TIME
DERATING FACTORS: The deration factors applicable under different conditions are given below: (OF STANDARD TEFC MOTORS OPERATING AT RATED VOLTAGE AND FREQUENCY)
POLE 2 4 6 8
Operating conditions:
A: 415 V +/- 6%, 50Hz +/-3% FRAME Hot Cold Hot Cold Hot Cold Hot Cold
B: 415V +/-10%, 50Hz +/- 5% 63 10 20 15 30 . - - -
Table A: permissible output as % of standard output for different Ambient temperatures 71 10 20 10 20 10 20 15 30
80 10 20 10 20 10 20 15 30
Ambient Temp. 400 450 500 550 600 650
90 10 20 10 20 10 20 15 30
A 100% 100% 93.3% 86.7% 80% 73%
100 8 16 8 16 10 20 10 20
B 100% 100% 92% 85% 78% 70.5%
112 8 16 8 16 10 20 10 20
132 8 16 8 16 10 20 10 20
Table B: Permissible output as % of standard output at different altitude
160 10 22 10 22 10 22 10 22
Altitude in Mtrs 180 10 22 10 22 10 22 10 22
Above MSL 1000 1500 2000 2500 3000 3500 4000 200 12 27 12 27 12 27 12 27
A 100% 98% 93% 87% 82% 78% 73% 225 12 27 12 27 12 27 12 27
B 100% 95% 90% 84% 78% 75% 70% 250 12 27 12 27 12 27 12 27
280 15 33 15 33 15 33 15 33
Table C: Permissible output as % of standard output for different % of unbalance in Voltage 315 15 33 15 33 15 33 15 33
% Unbalance 1% 2% 3% 4% 5% 355 15 33 15 33 15 33 15 33
A 100% 100% 95% 82.5% 75% Cold - Ambient Temp. 45 ° C
B 100% 95% 90% 78% 70%
Hot - Max. permissible Temp. 120 ° C
Table D: Permissible output as % of standard output at different voltages Limiting Temprature - upto 185°C for class "B" Insulation
Voltage 100% 90% 85% 80% 70%
upto 210°C for class "F" Insulation
40° C Ambient 100% 100% 90% 85% 75%
45° C Ambient 100% 90% 85% 80% 70%

Table E: Permissible output as % of standard output * for different duties

S2 S3 S4-S9
60Min 30Min 10Min 60%CDF 40%CDF 25%CDF
A 110% 120% 130% 110% 110% 130% Special
B 100% 115% 120% 100% 105% 120% Design
Required

* Standard motors for above permissible output will have starting and breakdown torque proportionately reduced as
% of FLT, hence these will be suitable only for application requiring low starting torque and are to be started Direct-
On-Line.

NOTE: When motor is subjected to two or more variations in above mentioned conditions, then all the appropriate
factors are to be multiplied to arrive at permissible output

32 33
 APPLICATIONS

TOTALLY ENCLOSED SQUIRREL CAGE INDUCTION MOTORS DUAL SPEED MOTORS

(FRAME V/S kW OUTPUT) (Single winding)
AIR STREAM RATED MOTORS
CONSTANT TORQUE APPLICATION
These are totally enclosed motors without normal fan of TEFC motors. The applications of these motors are for fans,
blowers, exhausts etc. wherein the fan or impellers acting as load suck air from DE or NDE, that flows over the motor body.
FRAME 2/4 4/6 4/8 6/8 6/12
This air provides the cooling for the motors. Hence, it is necessary that the velocity of the air flowing over the motor should
not fall below the velocity of air due to normal fan of a TEFC motor. The minimum air velocity is given in the table below. ND90S** 0.9/0.45 0.37/0.25 0.37/0.19 --- ---
#0.84/0.55 #0.67/0.37
OUTPUT VS. AVERAGE AIR VELOCITY
ND90L** 1.2/0.6 0.75/0.55 0.55/0.28 --- ---
FRAME 2 POLE 4 POLE 6POLE 8POLE #1.1/0.75 #1.1/0.55
SIZE KW AIR VELOCITY KW AIR VELOCITY KW AIR VELOCITY KW AIR VELOCITY ND100L 2.4/1.2 1.1/0.82 1.1/0.55 --- ---
O/P (AV) M/S O/P (AV) M/S O/P (AV) M/S (AV) M/S #2.2/1.5 #1.65/1.0
80 .75 10 .75 7.5 .55 6.5 .37 5.0 ND112M 3.7/1.86 2.2/1.6 1.94/0.97 --- ---
90 2.2 12.5 1.5 9 1.1 7.5 .55 6 #3.0/2.2 #2.2/1.5
100 3.7 15 2.2 10 1.5 8 1.1 7 ND132S 5.2/2.6 3.7/2.5 3.0/1.5 --- ---
112 5.5 16.5 3.7 11 2.2 9 1.5 7.5 #4.3/2.8 #3.3/2.2
132 9.3 18 7.5 12 5.5 9.5 3.7 8 ND132M 6.0/3.0 5.5/4.1 4.5/2.2 --- ---
160 18.5 19 15 12.5 11 10.5 7.5 8.5 #7.5/5.0 #4.5/3.0
180 22 20 22 13.5 15 11 11 9 ND160M 11.0/7.5 7.5/5.5 7.5/3.7 5.5/3.7 ---
200 37 21 30 14 22 11.5 15 9.5 ND160L 15.0/11.0 11.0/7.5 11.0/5.5 7.5/5.5 ---
225 45 22 45 14.5 30 12 22 10 ND180M 18.5/15.0 13.0/9.3 12.5/6.3 9.3/6.3 ---
250 55 23 55 15 37 12.5 30 10.5 ND180L 20.0/17.0 15.0/11.0 15.0/7.5 11.0/7.5 ---
ND200L 26.0/22.0 22.0/17.0 22.0/11.0 15.0/11.0 ---
NON-VENTILTED MOTORS ND225S 30.0/26.0 27.5/18.5 27.5/13.8 18.5/13.8 ---
These are totally enclosed motors, where the heat generated is dissipated by the body alone, with no provision for cooling.
ND225M 37.0/33.5 33.5/22.0 33.5/16.8 22.0/16.8 ---
As these motors are naturally cooled, the ratings are required to be offered in higher frames.
ND250M 52.0/41.0 45.0/30.0 45.0/22.0 30.0/22.0 ---
MULTI-SPEED MOTORS
Table one indicates ratings of Multispeed motors for polarity ratio of 2/4p, 4/6p, 4/8p, 6/8p, and 6/12p. These are of tapped ND280S --- * 45.0/37.0 --- ---
or PAM winding construction. For other ratios, please refer to us. Also three speed and four speed motors are offered as ND280M --- 45.0/30.0 55.0/28.0 --- ---
per customer's requirement. ND315S --- 55.0/37.0 75.0/25.0 --- ---
The frame/output relationship in table one is confirmed subject to knowing ND315M --- * 75.0/45.0 --- ---
a. Complete application details. ND315L --- 132.0/90.0 132.0/67.0 ---
b. Duty cycle/loading cycle
c. Method of braking --- --- 110.0/55.0 --- ---
2
d. Load GD referred to motor speed.
** For 4 / 8 pole Frames will be D90S/L
Motors required for Multispeed/two speed operations are designed with two types of winding techniques - For ratings marked as *, refer to Division
1. Tapped winding (also called Dahlander winding) where the two speeds are in ratio of 2:1
2. Separate windings one for each speed, when the output speeds are other than 2:1 ratio. The latter results in
considerable reduction in HP output.

Note: Motors will be suitable for DOL Starting only.

34 35
DUAL VOLTAGE MOTORS MOTORS FOR VARIOUS APPLICATIONS
Sector Type of motor Name of Major Customer
Motors can be offered for dual voltage operation. Such motors are so designed that they work satisfactorily on
both the voltages, but motor may not give optimum performance at both the voltage Compressor Motors with service factors Ingersoll Rand, KG Khosla,
Atlas Copco, Blue Star, Alfa Laval,
Two kinds of dual voltage motors are offered. ELGI, York Refrigeration
Motors operating at voltages in a ratio of 1: 1.73 or √3
Ventilator & Flakt India, Blue Star Air Conditioning
Entire range of motors can be suitably wound to operate in such voltage combinations. This method is also known as Allied Corporation, Paharpur Cooling Towers,
Delta-Star reconnections. Motor is DELTA connected at lower voltage and STAR connected at higher voltage. 6 lead Equipment Voltas
terminal blocks is fitted and suitable connecting links are provided (if required). These motors are suitable for standard Pump Greaves, KSB Pumps, BPCL, Beacon Weir, SULZUR,
supply variations.Example: KBL, Kirloskar Ebbara, Mather & Platt
A motor designed for 380V operation (STAR connection) can also be run with 220V supply (MESH connection)
380 Marine Marine Duty, Shock Grade Mazagaon Dock, Flakt, BEST & Crompton
---- =1.73 GRSE, Goa Shipyard, BE Pumps, Alekton Engg.
220 Material Conveyor Crane/Host L & T, Mcnally & Bharat, Mukund,
Handling Elecon Engg, Rewa Engg, TRF
Hence merely by changing the position of connecting links, dual voltage operation can be achieved Alternatively this can
also be performed with the help of a suitable starter. Lift High Torque Motors City Lift. ECE, Otis Elevators
M/C Tools M/C Tool Applications HMT, GSMTC, BEMCO M/c Press
Motors operating on voltage in a ratio of 1: 2
Gear Box Power Build, New Allenburry Works,
This phenomenon involves Series Parallel connections in the windings. Motors are DELTA wound at both the voltages. Essential Power Transmission, DYNASPEED
Such motors have 9 leads (for DOL starting at both voltages) coming out from stator windings. Railway Blower, Auxiillary Motors CLW, ELGI, ACCEL, FLAKT, ACCO
for compressor exhaust
Slipring motors and Multispeed cannot be offered for dual voltage operations.
Power NTPC, DCL, BHEL, DESEIN, MSEB,
Flameproof motors are generally not offered with series parallel reconnection because of limitations of terminal studs INDURE, GEB, TNBB, PSEB, WBSEB,
inside the terminal box. However specific cases may be sent to Division for scrutiny. RAPP KPCL, NPC, DPG.
Chemical Supreme Petro, Finolex, HPCL
Petrochemicals Flameproof Type 'e' IOCL, IPCL, ONGC, HALDIA PETRO
MRPL, SPIC, RELIANCE, ESSAR
Fertilisers Type 'e', Type 'n' RCF, FACT, GNFC, GSFC, NFL, IFFCO
Cement L & T, Indian Rayon, Vikram Cement, Rajashree
Cement, Grasim Industries, Gujrat Himalaya
Gujrat Ambuja, Sanghi Cement, Madras Cement
Vishakha Cement, Orient Cement, India Cement
Steel Plant Vizag Steel Plant, Bokaro Steel Plant, Bhilai
Steel Plant, TISCO, Rourkela Steel Plant, Durgapur
Steel Plant, SAIL, Lloyd Steel, Jindal Steel
Sugar ISGEC, WALCHANDNAGAR, KRUPP,
NHEC, FULLER KCP

36 37
 TESTING OF MOTORS

ORDERING INFORMATION
TESTING OF MOTORS OTHER TESTS
At the time of sending an enquiry or placing an order, kindly furnish following data (as much as possible)
All motors are tested in accordance with IS Apart from the above tests mentioned in the
325. Indian Standards, following additional tests CUSTOMER
can be offered. 1 FRAME SIZE
2 APPLICATION
TYPE TESTS a. Over speed test Running of motor at 1.2 3 ZONE/DIV (IN CASE HAZARDOUS AREA)
times the maximum rated speed for 2 4 ENCLOSURE GROUP (FOR TYPE Ex 'd')
The following tests are carried out on one 5 TEMP CLASS (FOR TYPE e/N/Ex 'd')
Mins at no load.
motor in a batch production or on motors 6 ANY SPECIFIC STATUTORY /
specially required to be type tested as per b. Vibration test Carried out as per REGULATORY REQUIREMENTS
customer's requirement. All tests included in IS :12075 7 REFERENCE TO INDIAN / IS:325 IS:2148 IS:6381 IF OTHER
INTERNATIONAL STD. IS:9628 IS:7389 SPECIFY
routine tests and following additional tests c. Noise level of the motors measured as 8 ANY CUST /CONSULTANT SPECS.
are carried on the motor. per IS:12065 9 TYPE OF ENCLOSURE TEFC SPDP TYPE d IF OTHER
a. Measurement of stator resistance TYPE p TYPE e TYPE n SPECIFY
d. Test for degree of protection as per 10 TYPE OF ROTOR SCR SR: WIRE or IF OTHER
b. No Load Test nd
IS 4691 (2 numeral only) BAR SPECIFY
c. Locked rotor test at reduced voltage and 11 TYPE OF DUTY S1 S2 S3 S4 IF OTHER
measurement of current, power input and S5 S6 S7 S8 S9 SPECIFY
torque of motors. 12 % CDF
13 NO.OF STARTS/HR 6, 10, 90, 150, 300, 600, 900
d. Full load reading of voltage, current, 14 TYPE OF BRAKING /NO.OF. REVERSAL
power input and slip. 15 LOAD GD
2

e. Temperature rise test The temperature 16 DEGREE OF PROTECTION IP54 IP55 IP21 IF OTHER SPECIFY
rise of the motor after being run on full IP22 IP23
17 METHOD OF COOLING FAN NATURAL BLOWER IF OTHER SPECIFY
load till steady state is reached is AIR STREAM
determined by 18 MOUNTING
i. Thermometer method 19 FREQUENCY IN Hz & VARIATION 50 + 5% IF OTHER SPECIFY
ii. By resistance method 20 OUTPUT IN KW
21 RATED VOLTAGE AND VARIATION 415 + 10% IF OTHER SPECIFY
f. Momentary overload test 22 CLASS OF INSULATION F H
g. Insulation resistance test 23 APPROX SPEED, IN RPM OR POLARITY
h. High voltage test 24 DIR OF ROT VIEWED FROM DE BI DIR ACW CW
25 DESIGN AMB TEMP.
26 % REL HUMIDITY
ROUTINE TESTS 27 MAX. PERMISSIBLE TEMP.RISE BY RES IF OTHER SPECIFY
28 ALTITUDE AT SITE IN METER <1000M IF OTHER SPECIFY
The following are the routine tests carried out 29 PERFORMANCE REQUIREMENT FL 3 /4 FL 1 /2FL
on each and every motor. a. EFFICIENCY
a. Measurement of resistance b. POWER FACTOR
c. LOAD CURRENT
b. Insulation resistance test. d. STARTING CURRENT
e. STARING TORQUE
c. Motors are tested at 1/3 times the rated f. RV/RA
voltage for checking the ability of the g. PULL OUT TORQUE
motor to run up to the full speed, when h. NOISE LEVEL (OTHER THAN IS:12065)
switched in either direction. i. VIB LEVEL (OTHER THAN IS:12705)
j. ANY OTHER
d. No load test. This test is carried out at 30 SYSTEM OF EARTHING, IF ADOPTED
rated voltage and the readings for 31 PARTICULARS OF TESTS TO BE CARRIED OUT (OTHER THAN TYPE & ROUTINE AS PROPER IS:325)
32 METHOD OF STARTING DOL Y/D SOFT START
current, RPM & power input are noted. IF OTHER SPECIFY
e. Locked rotor test This test is carried at a 33 DRIVE(IF APPLICABLE) VVVF(* FREQ RANGE) IF OTHER SPECIFY
reduced voltage by passing the full load 34 DIMENSIONS STD IF OTHER SPECIFY
35 GA DRG.NO (IF NON STD)
current and the readings for current and 36 METHOD OF DRIVE BELT BELT PULL / PULLEY DIA
power input are noted. DIRECT TYPE OF COUPLING
OTHER
f. High voltage test 37 CABLE SIZE/TYPE
NOTE: The meters used for noting the above 38 CABLE GLAND (IF REQD) DCG MINING P&S
readings have class 0.5 class accuracy. 39 ACCESSORIES THERMISTOR
SPACE HEATER BTD IF OTHER SPECIFY.
RTD IF OTHER SPECIFY
40 NON STD TREATMENT ACP IF OTHER SPECIFY
41 ANY OTHER SPECIFIC REQUIREMENT
* TORQUE OVER ENTIRE FREQUENCY
RANGE

38 39
 GUIDE & CHECK POINTS
FOR MOTOR SELECTION

GUIDE & CHECK POINTS FOR MOTOR SELECTION GUIDE & CHECKPOINTS FOR MOTOR SELECTION
MECHANICAL ASPECTS ELECTRICAL ASPECTS

CONSTANT TORQUE
1000m OR LESS DRIVE TORQUE TORQUE
CHARACTERISTICS FLUCTUATING
ALTITUDE EXPLOSIVE GAS FLAME PROOF TYPE 'd' OPERATING SPEED CHARACTERISTICS
ABOVE 1000m OF THE LOAD TORQUE
ENVIRONMENT TYPE 'e' OR 'N' OR 'P' TRANSFER EFFICIENCY OPERATING
45° C OR LESS ANBIENT CORROSION CONTINUOUS
CHARACTERISTICS OPERATION
OVER 45° DUST, CARBON etc LOAD GD2
HUMIDITY IP 22 LOAD TORQUE
LOW TEMPERATURE HOUSING INTERMITTENT
DRIP PROOF (INDOOR) IP 23 FLUCTUATION FREQUENT
(<20° C) PROTECTION RAIN PROOF (INDOOR) IP 55 RATED OUTPUT SINGLE SPEED, START/STOP
TOTALLY ENCLOSED TOTALLY ENCLOSED
FAN COOLED IP 56 & SPEED CONSTANT OUTPUT
(OUT DOOR)
INTERNAL FAN (DP) HUMIDITY MULTI SPEED,
VENTILATION
SINGLE VOLTAGE WITH CONSTANT OUTPUT
NATURAL COOLED
AIR STREAM RATED VARIATION - 110-660V VOLTAGE MULTI SPEED,
STANDARD POWER BELT-TYPE : No. OF MULTI OUTPUT
SHAFT END BELTS
DOUBLE SHAFT
TRANSMISSION DUEL VOLTAGE - λ/∆
FLEXIBLE COUPLING
TAPERED ∆/∆∆ 50 Hz
GEAR BOX FREQUENCY
HOLLOW SHAFT 60 Hz
HORIZONTAL MOUNTING FOOT SINGLE CAGE ANY OTHER
FLANGE SQUIRREL FREQUENCY
VERTICAL INSTALLATION CAGE
FACE DOUBLE CAGE ROTOR TYPE
ROD
DIMENSIONS IS/BS/IEC BAR WOUND
NEMA SLIPRING
USER DIMENSION WIRE WOUND DOL START
SINGLE ARMOUR TYPE OF TYPE OF STARTING STAR-DELTA START
DOUBLE ARMOUR TERMINAL BOX DIRECTION OF BOTTOM
CABLE
CABLE ENTRY SIDE AUTO-TRANSFORMER
WITHOUT ARMOUR
TOP START % TAPPING
ONE OR TWO NO OF CABLE MECHANICAL
FLAME PROOF DOUBLE COMPRESSION BREAKING
SIZE OF CABLE TYPE GLAND ARMOUR CLAMP PLUGGING
PLUG & SOCKET DC INJECTION NORMAL STARTING
NOISE STANDARD - AS PER IS TORQUE (200-250%) TORQUE
LOW NOISE CHARACTERISTICS HIGH TORQUE
VIBRATION (ABOVE 250%)
STANDARD SOFT STARTING (LOW
PRECISION CLASS F TEMPERATURE RISE PULL OUT TORQUE)
STANDARD LOAD BALL, ROLLER
BEARINGS CLASS H & INSULATION

AXIAL THRUST ANGULAR CONTACT BALL

SPECIAL PAINT SHADE OTHERS
SPECIAL NAME PLATE SPHERICAL BALL DETERMINATION
DIRECTION OF OF MOTOR
ROTATION SPECIFICATION
DETERMINATION OF
MOTOR
SPECIFICATION

40 41