Technical Specification for

AC Induction Motors

(Based around IEC 60034)

Contents
1. Definitions & Scope .....................................................................................3

1.1. General ............................................................................................3

1.2. Scope of supply...............................................................................3

2. Motor Technical Details...............................................................................4

1.3. Specifications...................................................................................4

1.4. General Requirements....................................................................4

1.5. Motor Ratings ..................................................................................4

1.6. Driven Load .....................................................................................5

1.7. Rotation Direction............................................................................5

1.8. Motor Bearings ................................................................................5

1.9. Starting.............................................................................................5

1.10. Electrical Protection.........................................................................5

1.11. Temperature Sensors .....................................................................6

1.12. Anti-condensation Heater ...............................................................6

1.13. Motor Cable Terminal Box ..............................................................6

1.14. Noise and vibration..........................................................................6

1.15. Auxiliary systems.............................................................................6

3. Other Requirements ....................................................................................7

1.16. Drawings and Documents ..............................................................7

1.17. Factory Testing................................................................................7

1.18. Site Testing......................................................................................8

1.19. Packaging ........................................................................................8

1.20. Operation and Maintenance Manuals............................................8

1.21. Installation and Commissioning......................................................9

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 11 KV MOTOR SUPPLY CONTRACT
TENDER INSTRUCTIONS AND SPECIFICATION

1.22. Electronic files..................................................................................9

4. Tender Schedules .....................................................................................10

1.23. Additional Tender Information .....................................................11

PAGE II
1. Definitions & Scope

1.1. General

Purchaser – Add details of the motor purchaser here

Supplier - the motor supply tenderers

This document details the technical requirements for ac induction motors manufactured in
accordance with IEC 60034. Contractual, commercial, delivery, insurance, spare parts, site
attendance and installation requirements are to be specified elsewhere.

1.2. Scope of supply

Works and Materials shall include the following:

1) Design, manufacture, supply, and delivery motors complete with any recommended on-
board instrumentation, CTs, seals, and bearings.
2) Supply of documents and drawings as listed in 3.
3) Project management, management of quality assurance, liaison with the Purchaser, and
all other Supplier obligations.
2. Motor Technical Details

1.3. Specifications

Motors shall be designed, built and tested in accordance with the latest edition of the
following standards:

IEC 60034 - Rotating Electrical Machines (AS 1359)

All other applicable IEC standards

1.4. General Requirements

The motors to be supplied shall be standard production models with a proven track record,
and cost effective manufacture. Therefore this specification does not proscribe unnecessary
details of construction requirements other than those considered to be essential, and to require
that the equipment shall be suited for the intended operational duty.

Motors shall be designed and assembled by the same manufacturer. Each of the motors
supplied shall be fully interchangeable with any other motors supplied that are of the same
model. The motors shall be designed to allow convenient disassembly for maintenance. The
stator winding and core shall be removable to allow for future rewinding or replacement.

1.5. Motor Ratings

Motors shall be rated as follows:

Voltage: Specify motor voltage (line to line)

Rated Output: Specify rated output of motor

Number of Poles: Specify number of poles

Duty Classification: S1

Rated Frequency: 50 Hz

Insulation: F (minimum)

Maximum Temperature Rise: 80 oC (at full load)

Mounting: IM B3

Degree of Protection IP44

Method of Cooling: IC0A1

Design Life: 30 Years

Change the above ratings if applicable. Ratings as shown indicate S1 – continuous running
duty; F – 115 K windings; IM B3 – mounted feet down; IP 44 – solid objects < 1mm,
splashing; IC0A1 – air cooled, self circulation.

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1.6. Driven Load

Optional clause. Add details of the driven load if special or may affect motor performance.

1.7. Rotation Direction

Installation arrangements dictate that some motors will rotate clockwise and others
anticlockwise. Motors will be required to rotate either clockwise or anticlockwise. The
Supplier shall confirm that the motors will suffer no adverse effect under these conditions.

If rotation is not an issue this clause can be removed.

1.8. Motor Bearings

Optional clause. If bearings are an issue, they can be clarified here. Considerations could
include bearing life, accessibility greasing and/or oil-filling , dust seals, etc.

1.9. Starting

All motors shall be suitable for Direct on Line starting for a minimum of three starts per hour.

Additional starting conditions can be listed, i.e. air or vacuum contactor, starting against a
closed valve, etc.

1.10. Electrical Protection

Each will protect by a numerical protection relay (provided by others), which will include:

Differential protection

Instantaneous overcurrent

Reverse phase, phase imbalance and negative sequence

Under voltage

Under current

Earth fault

Over temperature

Restart inhibit by thermal replica model

Supervised start up.
The Supplier shall provide and install the necessary CTs to enable differential protection to be
applied across the motor. CT specification is to be 150:1 A, 15VA and 5P10 and installed in
the terminal box. In addition the Supplier is to provide all necessary information and motor
characteristics to enable the above protection functions to be correctly set within the relay.

Consider deleting the text marked in blue for smaller motors or modifying the protection to
suit that being installed.

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1.11. Temperature Sensors

Three wire PT100 RTD temperature sensors shall be installed in each motor at the Works for
each bearing and for each phase of the stator winding. All RTD wiring shall be brought out
into a separate terminal box, fitted with DIN rail mount terminals, located on the outside of
the motor frame.

Consider removing this requirement for small motors.

1.12. Anti-condensation Heater

Each motor shall be provided with a sufficient number of anti-condensation heaters, for
connection to a 230 V 50 Hz supply, to evenly raise the motor temperature at least 3 °C above
ambient. The heater wiring shall be brought out into a separate terminal box, fitted with DIN
rail mount terminals, located on the outside of the motor frame. The motor heater will be
switched off during motor operation.

Modify according if environmental conditions dictate otherwise or supply voltage is different.

1.13. Motor Cable Terminal Box

Each motor shall be supplied with a split cast iron or steel IP54 rated terminal box for
connection of the stator windings. The terminal box shall be arranged on the side of the
motor and shall be capable of being rotated into any of the four 90 ° positions. The terminals
and clearances shall be suitable for air insulated cable terminations at the rated operating
voltage.

If six wire connections are provided, bridging links shall also be provided to allow a three-
wire delta (or star) connection. A blank, removable gland plate shall be fitted to the terminal
box with metric bolts. Terminal box(s) shall be adequately sized to incorporate the supply
cables, CTs and auxiliary wiring.

1.14. Noise and vibration

Noise and vibration are covered in IEC60034-9. Consider adding any special requirements
here.

1.15. Auxiliary systems

Supplier should specify any required or recommended auxiliary systems necessary for
satisfactory operation of the motors such as water cooling systems, bypass flow systems, or
lubricating systems. Suppliers at their discretion may also include any such auxiliary systems
within the scope of supply offered.

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3. Other Requirements

The following general requirements should be modified to suit the particular requirements for
the motors being sought.

1.16. Drawings and Documents

The Supplier shall provide the following drawings and documents:

4) Outline drawings of the motors, mountings and terminal boxes showing dimensions and
weights;
5) Wiring and schematic diagrams;
6) Cross sectional drawings of the motors showing each and assembly views.
7) Itemised components lists showing type, grade, class of material used, and make and
model of the standard components used;
8) Drawings covering the installation of the motor;
9) A description of the factory test facility and the test procedures proposed.
10) Factory test report confirming test facility and performance tests.
11) Site test procedures and start-up instructions;
12) Operation and Maintenance manual.

1.17. Factory Testing

Purchaser’s inspector shall be permitted to witness factory testing of the motors, and shall be
provided reasonable notice and assistance to facilitate this. The Supplier shall provide at least
one-month notice of certified factory testing.

Factory testing shall be in compliance with IEC 60034 and current industry standards. The
tests shall include, but not be limited:

Thermal performance and tests

Carried out in accordance with IEC 60034 to enable the machine thermal
classification to be verified.

Other performance and tests

Dielectric tests

Momentary excess torque for motors

Pull-up torque

Losses and Efficiency

Determination of the losses and efficiency associated with the machine. Losses
shall include constant losses, load losses and any other additional losses.

Verification of Noise Limits

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Vibration measurements and verification of limits
For small motors, the above test list could be omitted and reliance placed on the manufacturer to
adhere to IEC6004 testing only.

1.18. Site Testing

No Load Tests

Each motor shall be tested without connected load in accordance with the Supplier's
instructions to determine whether it has been properly installed. The motors shall be operated
at full rated speed. Should tests reveal a design or installation deficiency, or a manufacturing
error in any motor component, the problem shall be promptly corrected by and at the expense
of the Supplier.

Load Tests

Each motor shall be given an operating test under load for a period as directed by the
Purchaser. During the tests, the operation of the motoring units shall be observed and
measurements of current, noise, vibration, and bearing temperatures, shall be recorded for
each motor. The Supplier shall make all changes and correct any errors for which the
Supplier is responsible

1.19. Packaging

The motors and other equipment supplied shall be covered and protected from damage while
being transported, and while in storage during delivery. In particular damage arising from
impacts, vibration, and severe acceleration shall be prevented.

Each motor shall be packed and protected to be suitable for sea freight. Each motor shall be
protected against damage from water and/or salt and from the effects of vibration. Drain
holes shall be plugged during delivery. This paragraph may not be required.

1.20. Operation and Maintenance Manuals

The Supplier shall provide the Purchaser with Operating and Maintenance Manuals. Manuals
shall provide detailed operating instructions and cover all future maintenance work to the
motors. Electronic copies shall also be provided.

Drawings shall be in A3 size. Manuals shall be A4 size hard bound or in ring binders. The
manuals shall include as a minimum the Operation, Maintenance and Installation information
outlined below.

Operation

a description of the normal operation of the equipment;

a description of any safety features of the equipment;

detailed step-by-step operating instructions;

8

detail specifications and safe operating parameters for the equipment.

Maintenance

locations of service centres nearest to the site, and details of the workshop facilities and
expertise in motor overhaul and repair;

detail technical specifications of the equipment including routine maintenance, periodic
maintenance and repair instructions;

dimensioned layout drawings, complete with parts lists for all equipment;

drawings sufficient to enable complete dismantling and overhaul of equipment;

any specialist maintenance tools or test equipment requirements;

what proprietary components are used, e.g. bearings, seals, fuses etc, these shall be listed
by proprietary description as well as Supplier's part number.

proforma sheets detailing what maintenance work shall be carried out at specified
intervals (for example there shall be a sheet for weekly maintenance tasks, a sheet for
monthly maintenance tasks, etc). The proforma sheets shall contain checklists, tick
boxes and boxes for recording information required as part of the maintenance check.
1.21. Installation and Commissioning

The Supplier shall supply sufficient detailed and dimensioned drawings to permit complete
installation and commissioning of the equipment by others. This shall describe procedures to
be followed in assembling, installing, and testing the motors. The description shall be of such
a nature that it may be comprehended by an engineer or fitter without extensive experience in
erecting or installing motors of this type. The description shall be a step-by-step explanation
of operations required, and shall include, where applicable, such things as alignment
procedures, bolt torque values, recommended instrument setting up, and similar details.

1.22. Electronic files

The Operation and Maintenance Manuals shall also be provided to the Purchaser on duplicate
sets of CDs in the following formats:

a) Manuals : Microsoft Word 97

b) Drawings : AutoCad V2000i

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4. Tender Schedules

Supplier to complete one schedule for each type/size of motor at time of tender.

Item Information required Supplier to Complete

Manufacture:
1 Manufacturer
2 Model
3 Country of manufacture
Ratings:
1 Duty Classification
2 Voltage V
3 Rated Output kW
4 Rated Current A
5 Rated Frequency Hz
6 Number of poles
7 Rated Speed rpm
Construction:
1 Frame Designation
2 Shaft Designation
3 Mounting Designation (IM)
4 Degree of Protection (IP)
5 Total Mass of Machine kg
6 Winding Connection (Y or D)
7 Thermal Classification
Details:
o
1 Maximum Ambient Temperature C
o
2 Maximum Temperature Rise C
o
3 Water Coolant Max. C
(if applicable) Temperature
-1
Max. Flow ls
-1
Min. Flow ls
4 Design Altitude M
5 Noise Level dB
6 Space heater Voltage V
Power W
7 Winding Temp Sensor Type
Number
8 Bearing Temp Sensor Type
Number
9 Surge protection details
Cont…

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 Performance:
1 Service Life h
2 MTBF (mean time between failures) h
3 50% Load Efficiency %
Power Factor %
4 75% Load Efficiency %
Power Factor
5 100% Load Efficiency %
Power Factor
6 Locked rotor Current A
Maximum time %
(rated temperature)
7 Torque Full Load Nm
Breakdown Nm
Locked rotor Nm
Modelling Information:
2
1 Rotor Inertia Kg m
2 Acceleration time s
(purchaser to supply load details)
-1
3 Vibration mm s
4 Locked rotor R/X ratio
5 Stator resistance pu
6 Stator reactance pu
7 Magnetising reactance pu
8 Rotor resistance pu
9 Rotor reactance pu

1.23. Additional Tender Information

In addition to completing the tender schedules, the Supplier shall provide the following
information at the time of tender:

Performance curves at rated voltage and at 95% of rated voltage for torque, speed, slip,
current and efficiency.

Motor dimensional drawings

Manufacturers catalogues and technical literature

Details of any required or recommended auxiliary systems not included with the offer

Motor parameters required for the setting of the protection relays.

Any technical comments

Details of other items of supply that are offered. These shall include such items as
spares, couplings, special tools or lifting equipment and any other components offered

Other relevant information that may be available.

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