Instruction Leaflet

41-579.11B

Effective: January 1, 2012 Type TD-5

Supersedes I.L. 41-579.11, Dated May 2004
Time Delay Relay
( ) Denotes Text Change Since Previous Issue (for Class 1E application)
( * ) Denotes Figure Change Since Previous Issue

and heat removal from the containment and reactor, or

otherwise are essential in preventing significant release
of radioactive material to the environment.

The type TD-5 relay is used in timing applications where

Before putting relays into service, remove all
blocking inserted for the purpose of securing the accuracy, repeatability and fast reset are required. Its
parts during shipment. Make sure that all moving principal use is in time delayed distance relaying and in
parts operate freely. Inspect the contacts to see
that they are clean and can close properly. Close breaker failure timing applications.
the red handle switch last when placing the relay
in service. Open the red handle first when TD-5 is a dc relay capable of direct application to station
removing relay from service. batteries. It covers 0.05 to 30 seconds in 4 different
ranges.
CONTENTS

This instruction leaflet applies to Class 1E TD-5 Time

2.0 CONSTRUCTION AND OPERATION
Delay Relays which can be described as follows:

TD-5 Time Delay Relays with Smart Style Number The type TD-5 relay consists of a reference voltage circuit,
Ex: TD51ET1V1PNN a rheostat (T) and scale plate, a voltage biasing
potentiometer or adjustable resistor (P), a printed circuit
board containing static timing components; an output
1.0 APPLICATION relay (TR), and an indicating contactor switch (ICS). An
auxiliary relay (TX) is supplied on some TD-5 relays to
This relay has been specially designed and tested to
override bounce of the initiating contact.
establish its suitability for Class 1E applications in
accordance with the ABB Relay Division program for TR and TX are printed circuit board mounted miniature
Class 1E Qualification Testing as detailed in the ABB
power relays.
publication STR-1.

“Class 1E” is the safety classification of the electric

equipment and systems in nuclear power generating
stations that are essential to emergency shutdown of
the reactor, containment isolation, cooling of the reactor,

All possible contingencies which may arise during installation, operation or maintenance, and all details and
variations of this equipment do not purport to be covered by these instructions. If further information is desired by
purchaser regarding this particular installation, operation or maintenance of this equipment, the local ABB
representative should be contacted.

Printed in U.S.A.
41-579.11B Type TD-5 Class 1E Time Delay Relay

Figure 1. TD-5 Relay Front and Rear Views, Out of Case

2
Type TD-5 Class 1E Time Delay Relay 41-579.11B

TABLE OF REPLACEABLE PARTS

VOLTAGE
COMPONENT TIME DELAY RATING (VOLTS STYLE
DESIGNATION (SECONDS) DC) PARTNAME DESCRIPTION NUMBER
48/125 & 24/32 CAPACITOR 22UF 35V 10% TANTALUM 184A661H16
C1-C7 ALL 250 CAPACITOR 22UF 50V 10% TANTALUM 184A661H17
C8, C10 ALL ALL CAPACITOR 0.01 UF 20% 3KV CERAMIC 3536A32H02
C9 ALL ALL CAPACITOR 0.1 UF 20% 500V CERAMIC 184A663H14
D1-D6 ALL ALL DIODE 1N5398 188A342H24
48/125 & 24/32 RECTIFIER 2N885 SILICON CONTROL RECTIFIER 185A517H02
SCR ALL 250 RECTIFIER 2N886 SILICON CONTROL RECTIFIER 185A517H03
ALL 48/125 RESISTOR 150 OHM 25W 5% ADJ 05D1327H74
0.05-1 & 0.05-0.4 250 RESISTOR 1180 OHM 25W 5% ADJ 05D1328H27
1.5-30 & 0.2-4 250 RESISTOR 750 OHM 25W 5% ADJ 05D1328H19
P ALL 24/32 RESISTOR 50 OHM 25W 5% ADJ 05D1327H55
48/125 & 24/32 RESISTOR 1K 1/2W 1% 862A376H01
0.05-1 & 0.05-0.4 250 RESISTOR 1K 3W 5% 184A636H08
RL 1.5-30 & 0.2-4 ALL RESISTOR 5.6K 1/2W 1% 862A376H73
0.05-1 & 0.05-0.4 ALL RESISTOR 62K 1/4W 1% 3535A41H20
RP 1.5-30 & 0.2-4 ALL RESISTOR 267K 1/4W 1% 3532A38H42
ALL 48/125 RESISTOR 500 OHM 40W 5% (95 OHM TAP) 187A321H08
0.05-1 & 0.05-0.4 250 RESISTOR 2240 OHM 40W 5% FIXED 1955651
1.5-30 & 0.2-4 250 RESISTOR 1900 OHM 40W 5% FIXED 1955649
RS ALL 24/32 RESISTOR 45 OHM 40W 5% (22.5 OHM TAP) 184A064H03
TR ALL ALL RELAY MINIATURE POWER RELAY (6V) 9676A51H01
VR1-VR4 ALL ALL VARISTOR V320LA40B 3509A31H22
0.05-1 ALL RHEOSTAT 40K 2W 10% 9676A50H02
0.05-0.4 ALL RHEOSTAT 20K 2W 10% 9676A50H01
T 1.5-30 & 0.2-4 ALL RHEOSTAT 100K 2W 10% 9676A50H03
48/125 ZENER 1N2986B 10W 24V 629A798H03
250 ZENER 1N2999B 10W 56V 629A798H04
Z1 ALL 24/32 ZENER 1N2977B 10W 13V 629A798H02

ADDITIONAL COMPONENTS WHEN TX RELAY IS USED

48/125 & 250 RELAY MINIATURE POWER RELAY (48VDC) 9676A51H02
TX ALL 24/32 RELAY MINIATURE POWER RELAY (24VDC) 9676A51H03
VR5 ALL ALL VARISTOR V320LA40B 3509A31H22
ZENER 1.5KE200 878A619H01
Z2 ALL ALL ZENER 1N4529 AVALANCHE 837A875H03
ZENER 1.5KE200 878A619H01
Z3 ALL ALL ZENER 1N4529 AVALANCHE 837A875H03
Z4 ALL 250 ZENER 1.5KE200 878A619H01
48/125 & 250 CAPACITOR 4.7 UF 100V 20% 9645A13H20
C11 ALL 24/32 CAPACITOR 22 UF 50V 20% 9645A13H21
48/125 RESISTOR 5K 5W 5% 763A129H01
250 RESISTOR 7.5K 5W 5% 763A129H47
R1 ALL 24/32 RESISTOR 360 OHM 2W 5% 185A207H16
48/125 & 24/32 RESISTOR JUMPER 605920-010
R2 ALL 250 RESISTOR 7.5K 5W 5% 763A129H47
R3 ALL ALL RESISTOR 1.5K, 1/2W 1% 848A819H65
48/125 & 24/32 HEADER 3 POSITION SINGLE ROW 9640A47H01
JP1 ALL 250 HEADER NOT REQUIRED NONE
48/125 & 24/32 JUMPER BLUE CLIP 3532A54H01
JP1 ALL 250 JUMPER NOT REQUIRED NONE

3
41-579.11B Type TD-5 Class 1E Time Delay Relay

2.1 REFERENCE VOLTAGE CIRCUITS 2.4 PRINTED CIRCUIT BOARD

The reference voltage circuit provides a fixed supply voltage The printed circuit board (Timer Module assembly) con-
to the R-C time delay circuit and protects the static tains the following components:
components from high voltages. It consists of a silicon
power regulator and a series resistor. (see Figure 2):

The silicon power regulator (Z or Z1) is a 10 watt Zener • Diode D1 to protect the static components in case
diode mounted on an aluminum heat sink. The series the TD-5 relay is connected with reverse polarity.
resistor (RS) is a 3-1/2 inch 40 W resistor which is tapped • Limiting timing resistor RL.
for 24/32 VDC and 48/125 VDC relays, and fixed for 250 • Timing capacitor(s) C1 to C7.
VDC relays. • Resistor RP parallel to C, which makes the calibrating
scale non-linear.
2.2 RHEOSTAT (T) AND SCALE PLATE • Silicon-controlled rectifier SCR.
• Diode D2 to reverse bias the SCR.
The rheostat (T) provides a variable resistance for the
• Diode D3 to protect the static components from the
R-C time delay circuit. The timing scale is non-linear,
inductive voltage kick associated with the coil of the
as explained in Section 2.4, Printed Circuit Board.
TR relay.
Please note, do not remove the knob from the rheostat • Series diodes D4, D5 & D6 to compensate for the
forward voltage drop through the SCR and D2, and
shaft, since it is not easy to replace the knob in the
also compensate for zener (Z1) reference variations
calibrated position.
• Filter capacitors C8, C9 & C10.
• Miniature power relays TR and TX, see Sections 2.5
2.3 POTENTIOMETER (P) and 2.6 respectively.
The potentiometer (P) is a 2 inch wire-wound adjustable
• Varistors VR1 to VR5 across TR and TX relay
contacts.
resistor. (See Figure 1 respectively). The adjustable
terminal on the resistor should not be loosened at any
• Adjustable resistor P, see Section 2.3.

time, unless the relay is being re-calibrated.

• Silicon power regulator Z1, and resistor RS, see
Section 2.1.

The potentiometer (P) provides a biasing voltage, which

• Resistors R1, R2 connected in series with TX coil,
see Section 2.6
keeps the silicon-controlled rectifier (SCR) turned off until
the capacitor voltage reaches the potentiometer brush
• Resistor R3, capacitor C11, and zener Z2 to protect
the static components from the inductive voltage
voltage. The same functionality is achieved when (P) is
kick associated with the coil of the TX relay, see
an adjustable resistor. For simplicity, (P) will be referred
Section 2.6.
to as a potentiometer throughout this IL. Reference to
the potentiometer’s brush is equivalent to the adjustable
• Zener diodes Z3 and Z4.

terminal on the adjustable resistor.

• Jumper JP1 to select voltage rating.

4
Type TD-5 Class 1E Time Delay Relay 41-579.11B

Sub 1*
9676A77

Figure 2. Printed Circuit Board, Component Location

5
41-579.11B Type TD-5 Class 1E Time Delay Relay

2.5 TR RELAY This jumper is preset from the factory in Position 2 for
125 or 32 VDC operations. JP1 should should be set to
Construction:
Position 1 in order to change setting from 125 to 48 or
P.C. board mounted miniature power relay.
from 32 to 24 VDC.
Operation: JP1 is not required on 250 VDC relays.
The TR relay is energized by the SCR at the conclusion
of the time delay. Two sets of transfer contacts are
RELAY JP1 RELAY
provided to give a flexible trip circuit arrangement. RATING POSITION OPERATION
(VDC) (VDC)
2.6 TX RELAY
48/125 1 48
Construction:
P.C. board mounted miniature power relay. 48/125 2 125

Operation: 24/32 1 24
When used (see Figure 6), the TX relay is energized by
24/32 2 32
the application of dc voltage to the relay. Because of its
slow dropout characteristic, a contact of the TX relay is
connected externally around the contact of the initiating 2.7 INDICATING CONTACTOR SWITCH (ICS)
relay. This maintains voltage to the timing module of
the relay if the contact of the initiating relay bounces. The indicating contactor switch is a small dc operated
Discrete components (a resistor, diode, and capacitor) clapper type device. A magnetic armature, to which leaf-
are connected across the coil of the TX relay to protect spring mounted contacts are attached is attracted to
the static components from the inductive voltage kicks the magnetic core upon energization of the switch. When
associated with the coil of the TX relay. Typical operate the switch closes, the moving contacts bridge two
time for the TX relay is 7 ms. Dropout time is 15 ms. stationary contacts, completing the trip circuit. Also,
during this operation two fingers on the armature deflect
A jumper JP1 on the printed circuit board is provided on a spring located on the front of the switch, which allows
48/125 VDC and 24/32 VDC relays for setting the the operation indicator target to drop. The target is reset
resistance that is in series with the coil of the TX relay. from the outside of the case by a push-rod located at
the bottom of the cover.
.
The front spring, in addition to holding the target, provides
restraint for the armature and thus controls the pickup
value of the swtich.

For Class 1E relays, ICS units are available with 0.2,

1.0 or 2.0 amp fixed rating operating current values.
The relay nameplate identifies the value of the ICS in
the relay.

6
 Type TD-5 Class 1E Time Delay Relay 41-579.11B

2.8 OPERATION OF TD-5 RELAY 3.0 CHARACTERISTICS

Operation of the TD-5 relay occurs when the silicon The TD-5 relay is available in the following timing ranges:
controlled rectified (SCR) switches from a non-
conducting state to a conducting state. In the non- 0.05 - 0.4 seconds
conducting state, the SCR acts as an opened switch to 0.05 - 1.0 seconds
prevent energization of the TR relay, but in the conducting
0.2 - 4.0 seconds
state it acts as a closed switch to connect the TR relay
to the dc source. To switch the SCR from a non- 1.5 - 30 seconds
conducting state to a conducting state requires that a
The relay voltage rating can be 24/32 vdc, 48/125 vdc,
maximum of 20 microamperes flow in the gate of the
or 250 vdc.
SCR. This current is produced by the difference in voltage
across the capacitor (C) and brush of the potentiometer
(P). 3.1 VOLTAGE RATING OVER THE TEMPERATURE
RANGE
When dc voltage is first applied to the relay, voltage
instantaneously appears across the potentiometer brush The relay can stand 110% of rated voltage continuously
but is delayed in building up across the capacitor in over a temperature range of -40° C to +70° C.
accordance with the R-C time constant of the circuit.
As long as the capacitor voltage is less than the 3.2 REVERSE POLARITY
pontentiometer brush voltage, a reverse voltage appears
Diode (D1) limits reverse voltage of the static components
across the diode D2 and the SCR to keep the silicon
to less than one volt dc, so that no damage is done to
controlled rectifier (SCR) biased off.
the circuit by connecting the relay with reverse polarity.
However, the relay will, of course, not operate under
When the capacitor voltage reaches the potentiometer
this condition, and series resistor (RS) may overheat if
brush voltage plus approximately one volt (forward voltage
reverse voltage is applied for approximately 15 minutes
drops across SCR and D2), gate current will flow to the
or more.
silicon controlled rectifier SCR. This current switches
the SCR to a conducting state to allow the TR relay to 3.3 RESET TIME
pickup.
TR dropout time = 0.1 sec. or less. TR dropout time of
The SCR latches on when it switches and can be reset TD-5 Relay with TX contact is an additional 15 msec.
only by removing voltage from terminals 8 and 9 of the
relay. If a trip coil supervisory indicator lamp is used 3.3.1 Discharge of timing capacitor:
when the timer is used and with a fault detector to trip a
The discharge of C is essentially instantaneous, the
breaker, the breaker “a” contact must be connected
RC time constant through P being less than 20
between terminal 8 of the relay and negative.
milliseconds, in most cases. However, the discharge
The rate at which the capacitor charges is determined path through P is limited by silicon voltage drops through
by the rheostat (T) setting. The charging rate is not a SCR and D2, totaling approximately one volt. Therefore,
linear function of the rheostat setting, since RP gives a C discharges rapidly through P down to about one volt
parallel resistive path. This has the effect of expanding and then more slowly through RP down to zero volts.
the scale for short times and thereby permitting more
accurate settings.

7
41-579.11B Type TD-5 Class 1E Time Delay Relay

BATTERY DRAIN

24 32 48 125 250
VOLTS DC VOLTS DC VOLTS DC VOLTS DC VOLTSDC

0 0 0 0 0

500 mA 450 mA 240 mA 200 mA #

# = 100 mA for time delay ranges 0.05 - 0.4 and 0.05 - 1.0 seconds,
115 mA for time delay ranges 0.2 - 4.0 and 1.5 - 30 seconds.

Note: For TD-5 with TX Relay, there is an extra operating drain of 15 mA at 48, 125 and 250 VDC.

3.4 ACCURACY TABLE 2

The accuracy of the time delay depends upon the Timing accuracy for fast repetitions
repetition rate of consecutive timings, the supply voltage,
and the ambient temperature. Self-heating has a RELAY RANGE DELAY ACCURACY
negligible effect on the time accuracy. TIME DELAY BETWEEN AS PERCENT
(SECONDS) READINGS OF SETTING
3.4.1 Nominal Setting
0.05 - 0.4
INSTANTANEOUS +4%
The first time delay, as measured with the test circuit 0.05 - 1.0
shown in Figure 4, taken at 25° C and rated voltage,
will be within four milliseconds of its setting for settings 0.2 - 4.0 INSTANTANEOUS +4%
of 0.2 seconds or less. For settings above 0.2 seconds,
this accuracy will be ±2%. 1.5 - 30 APPROX. 0.5 SEC. +4%

3.4.2 Consecutive Timings

Incomplete capacitor discharge will cause changes in
3.4.3 Supply Voltage
time delay. These changes are a function of discharge
rate. Timing accuracy is shown per Tables 1 and 2.
Changes in supply voltage, between 80% and 110% of
TABLE 1 nominal, cause time delay variations of no more than
±3 milliseconds for settings of 0.3 seconds or less,
Timing accuracy for slow repetitions and no more than ±1% for settings above 0.3 seconds.

RELAY RANGE DELAY ACCURACY

TIME DELAY BETWEEN AS PERCENT
(SECONDS) READINGS OF SETTING
3.4.4 Ambient Temperature
0.05 - 0.4 AT LEAST 3
+2%
0.05 - 1.0 SECONDS
Changes in ambient temperature cause changes in time
0.2 - 4.0
AT LEAST 5
+2% delay. This variation in time delay is a direct function of
SECONDS
capacitance change with temperature. Typical variations
AT LEAST 5
1.5 - 30
SECONDS
+2% of time delay with temperature are shown in Fig. 3.

8
 Type TD-5 Class 1E Time Delay Relay 41-579.11B

Sub 2*
187A526

Figure 3. Timing Variations with Temperature Changes

3.5 INDICATING CONTACTOR SWITCH (ICS) 3.6 CONTACT RATING (TR & TX)

The seal-in contacts of the ICS will safely carry 30 Miniature power relay contacts: see table below.
ampers at 250 volts dc long enough to trip a circuit
breaker.

TRIP CIRCUIT CONSTANTS MINIATURE

INDICATING CONTACTOR SWITCH POWER RELAY @ 125 VDC @ 250 VDC
(TYPICAL VALUES) CONTACTS

0.2 AMP RATING 8.5 OHMS DC RESISTANCE TRIPPING DUTY 30A 30A
1.0 AMP RATING 0.37 OHMS DC RESISTANCE C ONTINUOUS 5A 5A
2.0 AMP RATING 0.10 OHMS DC RESISTANCE BREAK 0.3A 0.1A

9
41-579.11B Type TD-5 Class 1E Time Delay Relay

4.0 RELAY SETTINGS 4.4 INDICATING CONTACTOR SWITCH (ICS)

4.1 TIME DELAY No setting is required on the ICS.

Time delay is selected by adjusting rheostat T.

5.0 INSTALLATION
For Zone 2 distance applications, the timer setting
should be sufficient to allow relays and breakers beyond The relays should be mounted on switchboard panels
the next bus to clear the fault. The time should be set or their equivalent in a location free from dirt, moisture,
to allow successful breaker failure clearing. This usually excessive vibration, and heat. For semi-flush mounting,
requires a setting of approximately 0.25 seconds. Zone install the relay vertically by means of the four mounting
3 timing must coordinate with remote Zone 2 timing. A holes on the case flange. The mounting screws may
typical setting is 0.5 seconds. Breaker failure timing is also be utilized for grounding the relay. External toothed
set to assure normal fault clearing and fault detector washers are provided for use in the locations shown on
reset plus 2 to 3 cycles margin. Settings of 0.1 to 0.2 the outline and drilling plan (Fig. 7) to facilitate making a
second are typical. good electrical connection between the relay case, the
mounting screws, and the relay panel. Ground Wires
should be affixed to the mounting screws as required for
4.2 VOLTAGE RATING (RESISTOR - RS)
poorly grounded or insulated panels. The electrical
The correct tap on resistor RS should be selected for connections are made directly to the relay terminals by
the supply voltage being used, per the appropriate internal means of screws (also provided).
schematic (see Figures 5 to 6). Note that terminal 1 of
the RS resistor has a red dot for ease of identification. For detail information on the FT case refer to Instruction
leaflet 41-076 for semi-flush mounting.
• 48/125 VDC relays are preset from the factory at
125 Volts.

• 24/32 VDC relays are preset from the factory at 32 6.0 ADJUSTMENTS AND MAINTENANCE
volts.
Note: The proper adjustments to insure correct
• No adjustments are necessary for 250 VDC relays.
operation of this relay have been made at the
4.3 TX RELAY factory and should not be disturbed after receipt
by the customer. In particular, do not remove knob
When the TX relay is used, the correct resistance in from rheostat shaft and do not loosen the
series with the coil of the TX relay has to be selected for potentiometer lock nut or adjustable resistor clamp.
the supply voltage being used. Upon receipt of the relay, no customer adjustment,
other than those covered under relay settings
To use the relay with a supply voltage of 48 or 24 VDC,
should be required.
move jumper JP1 on Printed Circuit Board to Position
1. This will jumper resistor R1, see Figures 2 and 6. 6.1 ACCEPTANCE CHECK

The following check is recommended to insure that the

relay is in proper working order. Perform a timing check
at minimum and maximum settings. A recommended
test circuit is shown in Figure 4. When testing the TD-
5 with a TX relay make the dotted connection as shown

10
 Type TD-5 Class 1E Time Delay Relay 41-579.11B

in Figure 4. The neon lamp will light if the TX relay is 6.3 TROUBLE SHOOTING PROCEDURE
operating properly.
Use the following procedure to locate the source of
trouble if the TD-5 is not operating correctly.
6.1.2 Indicating Contactor Switch (ICS)
1. Inspect all wires and connections, paying particular
Close the main relay contacts and pass sufficient dc
attention to telephone relay and printed circuit board
current through the trip circuit to close the contacts of
terminals.
the ICS. This value of current should not be greater
than the particular ICS nameplate rating. The indicator 2. Check the reference voltage circuit. This is done by
target should drop freely. measuring the dc voltage across the silicon power
regulator, Z or Z1. Connect the dc voltmeter positive
terminal to the bottom terminal of RS and the
Repeat above except pass 85% of ICS nameplate rating
negative terminal to relay terminal 8. Apply rated
current. Contacts should not pickup and target should
voltage per the test circuit diagram, Figure 4. The
not drop.
Zener voltage should be between 11.0 and 14.0 volts
for 24/32 VDC relays, between 21.5 and 25.5 volts
6.2 ROUTINE MAINTENANCE
for 48/125 VDC relays, and between 50 and 59 volts
for 250 VDC relays.
All relays should be inspected and checked periodically
to assure proper operation. Generally a visual inspection 3. Check the timing capacitor voltage and the P
should call attention to any noticeable changes. potentiometer brush voltage with an oscilloscope
or a high resistance dc voltmeter.
All contacts should be cleaned periodically. A contact
Connect between adjustable terminal of P and relay
burnisher S#182A836H01 is recommended for this
terminal 8.
purpose. The use of abrasive material for cleaning
contacts is not recommended because of the danger of The brush voltage, which is constant until the TR
embedding small particles in the face of the soft silver relay trips, should be approximately one half the
and thus impairing the contact. Also, a calibration check reference voltage. The capacitor should gradually
should be performed once a year to detect any electronic change to the potentiometer brush voltage, plus
component failures which can occur on a random basis. approximately one volt for silicon junction forward
voltage drops through SCR and D2.
Potentiometers, tantalum capacitors, and plastic cased
semi-conductors may have a common mode failure
4. If reference voltage, capacitor voltage, and
characteristic and routine replacement is recommended
potentiometer voltage all appear to be correct, the
on the following schedule:
SCR may be the cause of trouble. The anode to
cathode voltage, as measured, should be
Tantalum Capacitors C, C1 to C7 10 years
approximately one-half the reference voltage until
Potentiometer P 5 years the capacitor voltage reaches the P brush voltage,
Rheostat T 5 years at which time the anode to cathode voltage should
drop to approximately one volt.
Diodes D1 to D6 10 years

Recalibration is necessary whenever any of these

components are changed.

11
41-579.11B Type TD-5 Class 1E Time Delay Relay

Measure between anode of D3 and adjustable 7.3 SCALE PLATE CALIBRATION (NEW SCALE)
terminal of P.
If it is necessary to replace the potentiometer P or the
Printed Circuit Board, the relay should be recalibrated
7.0 CALIBRATION with a new scale plate. Use the following procedure:

Use the following procedure for calibrating the relay if 1. With the knob off the shaft, set the rheostat (T)
the relay has been taken apart, or the adjustments have at maximum.
been disturbed. This procedure should not be used
until it is apparent that the relay is not in proper working 2. Adjust P so that the times are 5% to 10% longer
order. (See Acceptance Check, Section 6.1). Before than the maximum scale marking.
calibrating, follow the Trouble Shooting Procedure,
Section 6.3, to locate the source of trouble.
3. Set the rheostat T at minimum and check that
times are less than or equal to the minimum
7.1 TR, TX RELAY ADJUSTMENT
scale marking. If not, adjust P slightly to reduce
No adjustments are necessary. times. Tighten locknut or adjustable terminal
on P.
7.2 RHEOSTAT KNOB ADJUSTMENT (SAME
SCALE)
4. Place the knob on the rheostat shaft in such a
If it is necessary to replace the rheostat (T) or the silicon position that the times are symmetrical with
power regulator (Z or Z1), in most cases the relay may respect to the scale plate marking. Tighten the
be recalibrated with the same scale plate. knob setscrew and mark calibration lines on
the scale plate. When striking calibration lines
for delays above 0.5 seconds, pause at least 3
This is done by rotating the rheostat shaft, without knob, seconds between readings. See Section 3.4
until a time delay equal to the minimum scale marking
is obtained. Then, align the knob for this delay and 7.4 INDICATING CONTRACTOR SWITCH (ICS)
tighten the knob set screw securely. Pause several
seconds between readings for all delays above .05 Initially adjust ICS unit on the pedestal so that armature
seconds. See section 3.4 Accuracy for discussion of fingers do not touch the yoke in the rest position, (viewed
this. from top of swtich between cover and frame). This can
be done by loosening the mounting screw in the molded
pedestal and moving the ICS in the downward position.

Contact Wipe - Adjust the stationary contacts so that

both stationary contacts make with the moving contacts
simultaneously and wipe is 1/64” to 3/64” when the
armature is against the core.

Target - Manually raise the moving contacts and check

to see that the target drops at the same time as the
contacts make or up to 1/16” ahead. The cover may be
removed and the tab holding the target reformed slightly

12
 Type TD-5 Class 1E Time Delay Relay 41-579.11B

if necessary. However, care should be exercised so If the pickup is low, the front cover must be removed and
that the target will not drop with a slight jar. the leaf spring bent outward equally.

Pickup - The unit should pickup at 98% of rating and 8.0 RENEWAL PARTS
not pickup at 85% of rating. If necessary, the cover leaf
springs may be adjusted. Repair work can be done most satisfactorily at the factory.
However, interchangeable parts can be furnished to
To lower the pickup current use a tweezer or similar tool customers who are equipped for doing repair work. When
and squeeze each leaf spring approximately equally by ordering parts, always give the complete nameplate data
applying the tweezer between the leaf spring and the of the relay.
front surface of the cover at the bottom of the lower
window.

Sub 3
187A527

Figure 4. Test Circuit for Type TD-5 Relay

13
41-579.11B Type TD-5 Class 1E Time Delay Relay

Sub 1*
9683A64

Figure 5. Internal Schematic of TD-5 Class 1E Relay in FT-11 Case

14
Type TD-5 Class 1E Time Delay Relay 41-579.11B

Sub 1*
9683A65

Figure 6. Internal Schematic of TD-5 Class 1E Relay in FT-11 Case, with TX Relay

15
41-579.11 Type TD-5 Class 1ETime Delay Relay

Sub 4
3519A65

Figure 7. Outline and Drilling Plan for Type TD-5 Class 1E Relays in FT-11 Case

ABB Inc.
Printed in U.S.A.
4300 Coral Ridge Drive
visit our website at www.abb.com/substationautomation Coral Springs, FL 33065
TEL: 954-752-6700
FAX: 954-345-5329