ABB TD-5 Manual

Instruction Leaflet
41-579.11B
Effective:January 1, 2012
Supersedes I.L. 41-579.11, Dated May 2004
( ) Denotes Text Change Since Previous Issue
( * ) Denotes Figure Change Since Previous Issue
Type TD-5
Time Delay Relay
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.
(for Class 1E application)
Before putting relays into service, remove all
blocking inserted for the purpose of securing the
parts during shipment. Make sure that all moving
parts operate freely. Inspect the contacts to see
that they are clean and can close properly. Close
the red handle switch last when placing the relay
in service. Open the red handle first when
removing relay from service.
CONTENTS
This instruction leaflet applies to Class 1E TD-5 Time
Delay Relays which can be described as follows:
TD-5TimeDelay Relayswith SmartStyleNumber
Ex: TD51ET1V1PNN
1.0 APPLICATION
This relay has been specially designed and tested to
establish its suitability for Class 1E applications in
accordance with the ABB Relay Division program for
Class 1E Qualification Testing as detailed in the ABB
publicationSTR-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
thereactor, containmentisolation,coolingofthereactor,
Printed in U.S.A.
andheat removalfrom thecontainmentand reactor, or
otherwiseareessential inpreventingsignificantrelease
ofradioactive materialtothe environment.
ThetypeTD-5relayis usedin timingapplicationswhere
accuracy, repeatability and fast reset are required. Its
principaluse isintime delayeddistance relayingandin
breakerfailure timingapplications.
TD-5isa dcrelaycapableof directapplicationtostation
batteries. It covers 0.05 to 30 seconds in 4 different
ranges.
2.0 CONSTRUCTION AND OPERATION
ThetypeTD-5relayconsistsofareferencevoltagecircuit,
a rheostat (T) and scale plate, a voltage biasing
potentiometer oradjustableresistor(P), aprintedcircuit
board containing static timing components; an output
relay(TR), andanindicatingcontactorswitch (ICS). An
auxiliaryrelay(TX) issupplied onsomeTD-5 relaysto
overridebounce ofthe initiatingcontact.
TRand TXare printedcircuitboardmountedminiature
powerrelays.

41-579.11B Type TD-5 Class 1E Time Delay Relay
2
Figure 1. TD-5 Relay Front and Rear Views, Out of Case

TypeTD-5 Class 1E Time Delay Relay 41-579.11B
3
TABLE OF REPLACEABLE PARTS
COMPONENT
DESIGNATION TIME DELAY (SECONDS)
VOLTAGE
RATING (VOLTS
DC) PARTNAME DESCRIPTION STYLE NUMBER
48/125 & 24/32 CAPACITOR 22UF 35V 10% TANTALUM 184A661H16
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
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
ALL 24/32 RESISTOR 50 OHM 25W 5% ADJ 05D1327H55
48/125 & 24/32 RESISTOR 1K 1/2W 1% 862A376H01
250 RESISTOR 1K 3W 5% 184A636H08
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
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
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
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
24/32 ZENER 1N2977B 10W 13V 629A798H02
ADDITIONAL COMPONENTS WHEN TXRELAY IS USED
48/125 & 250 RELAY MINIATURE POWER RELAY (48VDC) 9676A51H02
24/32 RELAY MINIATURE POWER RELAY (24VDC) 9676A51H03
VR5 ALL ALL VARISTOR V320LA40B 3509A31H22
ZENER 1.5KE200 878A619H01
ZENER 1N4529 AVALANCHE 837A875H03
ZENER 1.5KE200 878A619H01
ZENER 1N4529 AVALANCHE 837A875H03
Z4 ALL 250 ZENER 1.5KE200 878A619H01
48/125 & 250 CAPACITOR 4.7 UF 100V 20% 9645A13H20
24/32 CAPACITOR 22 UF 50V 20% 9645A13H21
48/125 RESISTOR 5K 5W 5% 763A129H01
250 RESISTOR 7.5K 5W 5% 763A129H47
24/32 RESISTOR 360 OHM 2W 5% 185A207H16
48/125 & 24/32 RESISTOR JUMPER 605920-010
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
250 HEADER NOT REQUIRED NONE
48/125 & 24/32 JUMPER BLUE CLIP 3532A54H01
250 JUMPER NOT REQUIRED NONE
C11 ALL
R1 ALL
JP1 ALL
R2 ALL
JP1 ALL
Z2 ALL ALL
Z3 ALL ALL
RP
RS
T
Z1 ALL
TX ALL
C1-C7 ALL
SCR ALL
P
RL 0.05-1 & 0.05-0.4

41-579.11B Type TD-5 Class 1E Time Delay Relay
4
The rheostat (T) provides a variable resistance for the
R-C time delay circuit. The timing scale is non-linear,
as explained in Section 2.4, Printed Circuit Board.
Please note, do not remove the knob from the rheostat
shaft, since it is not easy to replace the knob in the
calibratedposition.
2.3 POTENTIOMETER(P)
2.2 RHEOSTAT(T)AND SCALEPLATE
2.1 REFERENCEVOLTAGE CIRCUITS
Thereferencevoltagecircuitprovidesafixedsupplyvoltage
to the R-C time delay circuit and protects the static
components from high voltages. It consists of a silicon
powerregulator anda seriesresistor.
Thesilicon powerregulator (Z orZ1) isa 10watt Zener
diode mounted on an aluminum heat sink. The series
resistor(RS)isa 3-1/2inch 40W resistorwhich istapped
for24/32 VDCand48/125VDC relays,andfixed for250
VDCrelays.
Thepotentiometer (P)isa 2inchwire-wound adjustable
resistor. (See Figure 1 respectively). The adjustable
terminal on the resistor should not be loosened at any
time, unless the relay is being re-calibrated.
Thepotentiometer (P)providesa biasingvoltage,which
keepsthesilicon-controlledrectifier(SCR)turnedoff until
the capacitor voltage reaches the potentiometer brush
voltage. Thesame functionalityis achievedwhen(P) is
anadjustableresistor. For simplicity,(P) willbe referred
to as a potentiometer throughout this IL. Reference to
thepotentiometer’s brushisequivalent totheadjustable
terminalon theadjustable resistor.
2.4 PRINTEDCIRCUITBOARD
Theprinted circuitboard (TimerModuleassembly)con-
tains thefollowing components:
(see Figure 2):
•Diode D1 to protect the static components in case
theTD-5 relayis connectedwith reversepolarity.
•Limiting timing resistor RL.
•Timingcapacitor(s) C1to C7.
•ResistorRPparalleltoC,whichmakes thecalibrating
scalenon-linear.
•Silicon-controlledrectifier SCR.
•DiodeD2 toreverse biasthe SCR.
•DiodeD3 toprotect thestatic componentsfromthe
inductivevoltage kickassociated withthecoil ofthe
TRrelay.
•Series diodes D4, D5 & D6 to compensate for the
forwardvoltage drop throughthe SCRandD2, and
alsocompensateforzener (Z1)referencevariations
•Filter capacitors C8, C9 & C10.
•MiniaturepowerrelaysTR andTX,seeSections2.5
and2.6 respectively.
•Varistors VR1 to VR5 across TR and TX relay
contacts.
•Adjustable resistor P, see Section 2.3.
•Silicon power regulator Z1, and resistor RS, see
Section 2.1.
•Resistors R1, R2 connected in series with TX coil,
see Section 2.6
•ResistorR3, capacitorC11, andzenerZ2toprotect
the static components from the inductive voltage
kick associated with the coil of the TX relay, see
Section 2.6.
•ZenerdiodesZ3 andZ4.
•JumperJP1 toselect voltagerating.

Type TD-5 Class 1ETime Delay Relay 41-579.11B
5
Figure 2. Printed Circuit Board, Component Location
Sub 1*
9676A77

41-579.11B Type TD-5 Class 1E Time Delay Relay
6
2.7 INDICATING CONTACTORSWITCH (ICS)
The indicating contactor switch is a small dc operated
clappertypedevice.Amagneticarmature,towhichleaf-
spring mounted contacts are attached is attracted to
themagneticcoreuponenergizationoftheswitch.When
the switch closes, the moving contacts bridge two
stationary contacts, completing the trip circuit. Also,
duringthisoperation twofingers onthearmaturedeflect
aspring locatedonthefrontof theswitch,whichallows
theoperationindicatortargettodrop. Thetarget isreset
from the outside of the case by a push-rod located at
thebottom ofthe cover.
Thefrontspring,inadditiontoholdingthetarget,provides
restraint for the armature and thus controls the pickup
valueof theswtich.
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.
2.5 TR RELAY
Construction:
P.C.board mountedminiature powerrelay.
Operation:
TheTR relayisenergizedby theSCRat theconclusion
of the time delay. Two sets of transfer contacts are
providedto giveaflexibletripcircuit arrangement.
2.6 TX RELAY
Construction:
P.C.board mountedminiature powerrelay.
Operation:
Whenused (seeFigure6), theTXrelay isenergizedby
theapplication ofdcvoltageto therelay. Because ofits
slowdropout characteristic,a contactof theTXrelay is
connectedexternallyaroundthecontactof theinitiating
relay. This maintains voltage to the timing module of
the relay if the contact of the initiating relay bounces.
Discretecomponents(a resistor, diode,and capacitor)
areconnected acrossthe coilof theTX relayto protect
thestatic componentsfrom theinductivevoltagekicks
associatedwith thecoilof theTX relay. Typical operate
time for the TX relay is 7 ms. Dropout time is 15 ms.
Ajumper JP1ontheprintedcircuitboardis providedon
48/125 VDC and 24/32 VDC relays for setting the
resistance that is in series with the coil of the TX relay.
.
This jumper is preset from the factory in Position 2 for
125or 32VDCoperations.JP1should shouldbeset to
Position 1 in order to change setting from 125 to 48 or
from 32 to 24 VDC.
JP1 is not required on 250 VDC relays.
RELAY
RATING
(VDC)
JP1
POSITION RELAY OPERATION
(VDC)
48/125 1 48
48/125 2 125
24/32 1 24
24/32 2 32

Type TD-5 Class 1ETime Delay Relay 41-579.11B
7
2.8 OPERATIONOF TD-5 RELAY
Operation of the TD-5 relay occurs when the silicon
controlled rectified (SCR) switches from a non-
conducting state to a conducting state. In the non-
conductingstate, theSCR actsasanopenedswitch to
preventenergizationoftheTRrelay,butintheconducting
state it acts as a closed switch to connect the TR relay
to the dc source. To switch the SCR from a non-
conducting state to a conducting state requires that a
maximum of 20 microamperes flow in the gate of the
SCR. Thiscurrentisproducedbythedifferenceinvoltage
acrossthecapacitor(C)andbrush ofthepotentiometer
(P).
When dc voltage is first applied to the relay, voltage
instantaneouslyappearsacrossthepotentiometerbrush
but is delayed in building up across the capacitor in
accordance with the R-C time constant of the circuit.
As long as the capacitor voltage is less than the
pontentiometerbrushvoltage,areversevoltageappears
across the diode D2 and the SCR to keep the silicon
controlledrectifier (SCR)biasedoff.
Whenthe capacitorvoltage reachesthe potentiometer
brushvoltageplusapproximatelyonevolt(forwardvoltage
dropsacross SCRandD2), gatecurrent willflow tothe
silicon controlled rectifier SCR. This current switches
the SCR to a conducting state to allow the TR relay to
pickup.
TheSCR latcheson whenit switchesand canbe reset
onlyby removingvoltage fromterminals 8and 9of the
relay. If a trip coil supervisory indicator lamp is used
whenthe timeris usedandwith afault detectortotripa
breaker, the breaker “a” contact must be connected
betweenterminal 8of therelayand negative.
The rate at which the capacitor charges is determined
by the rheostat (T) setting. The charging rate is not a
linearfunction ofthe rheostatsetting, sinceRP givesa
parallelresistive path. Thishasthe effectof expanding
the scale for short times and thereby permitting more
accurate settings.
3.1 VOLTAGERATINGOVERTHETEMPERATURE
RANGE
Therelaycanstand110%of ratedvoltagecontinuously
overa temperaturerange of-40° Cto+70° C.
3.2 REVERSEPOLARITY
Diode(D1)limitsreversevoltageofthestaticcomponents
to less than one volt dc, so that no damage is done to
thecircuit byconnecting therelaywithreversepolarity.
However, the relay will, of course, not operate under
thiscondition, andseries resistor(RS) mayoverheat if
reversevoltageisappliedforapproximately 15minutes
ormore.
3.3 RESET TIME
TR dropout time = 0.1 sec. or less. TR dropout time of
TD-5 Relay with TX contact is an additional 15 msec.
3.3.1 Discharge of timing capacitor:
The discharge of C is essentially instantaneous, the
RC time constant through P being less than 20
milliseconds, in most cases. However, the discharge
paththroughPislimitedby siliconvoltagedropsthrough
SCRandD2,totalingapproximatelyonevolt.Therefore,
Cdischargesrapidly throughP downto aboutonevolt
andthenmore slowlythrough RPdown to zerovolts.
TheTD-5relayisavailableinthefollowingtimingranges:
0.05 - 0.4 seconds
0.05 - 1.0 seconds
0.2 - 4.0 seconds
1.5 - 30 seconds
Therelay voltagerating canbe 24/32vdc, 48/125vdc,
or250 vdc.
3.0 CHARACTERISTICS

41-579.11B Type TD-5 Class 1E Time Delay Relay
8
3.4.3 Supply Voltage
Changes in supply voltage, between 80% and 110% of
nominal, cause time delay variations of no more than
±3 milliseconds for settings of 0.3 seconds or less,
and no more than ±1% for settings above 0.3 seconds.
RELAY RANGE
TIME DELAY
(SECONDS)
DELAY
BETWEEN
READINGS
ACCURACY
AS PERCENT
OF SETTING
0.05 - 0.4
0.05 - 1.0 INSTANTANEOUS +4%
0.2 - 4.0 INSTANTANEOUS +4%
1.5 - 30 APPROX.0.5 SEC. +4%
3.4 ACCURACY
The accuracy of the time delay depends upon the
repetition rate of consecutive timings, the supply voltage,
and the ambient temperature. Self-heating has a
negligible effect on the time accuracy.
3.4.1 Nominal Setting
The first time delay, as measured with the test circuit
shown in Figure 4, taken at 25° C and rated voltage,
will be within four milliseconds of its setting for settings
of 0.2 seconds or less. For settings above 0.2 seconds,
this accuracy will be ±2%.
3.4.2 Consecutive Timings
Incomplete capacitor discharge will cause changes in
time delay. These changes are a function of discharge
rate. Timing accuracy is shown per Tables 1 and 2.
24
VOLTS DC
32
VOLTS DC
48
VOLTS DC
125
VOLTS DC
250
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.
BATTERYDRAIN
RELAY RANGE
TIME DELAY
(SECONDS)
DELAY
BETWEEN
READINGS
ACCURACY
AS PERCENT
OF SETTING
0.05 - 0.4
0.05 - 1.0
AT LEAST 3
SECONDS +2%
0.2 - 4.0 AT LEAST 5
SECONDS +2%
1.5 - 30 AT LEAST 5
SECONDS +2%
TABLE 2
Timing accuracy for fast repetitions
TABLE 1
Timing accuracy for slow repetitions
3.4.4 Ambient Temperature
Changes in ambient temperature cause changes in time
delay. This variation in time delay is a direct function of
capacitance change with temperature. Typical variations
of time delay with temperature are shown in Fig. 3.

Type TD-5 Class 1E Time Delay Relay 41-579.11B
9
Figure 3. Timing Variations with Temperature Changes
Sub 2*
187A526
3.6 CONTACT RATING (TR & TX)
Miniature power relay contacts: see table below.
MINIATURE
POWER RELAY
CONTACTS
@ 125 VDC @ 250 VDC
TRIPPING DUTY 30A 30A
CONTINUOUS 5A 5A
BREAK 0.3A 0.1A
3.5 INDICATING CONTACTOR SWITCH (ICS)
The seal-in contacts of the ICS will safely carry 30
ampers at 250 volts dc long enough to trip a circuit
breaker.
TRIP CIRCUIT CONSTANTS
INDICATING CONTACTOR SWITCH
(TYPICAL VALUES)
0.2 AMP RATING 8.5 OHMS DC RESISTANCE
1.0 AMP RATING 0.37 OHMS DC RESISTANCE
2.0 AMP RATING 0.10 OHMS DC RESISTANCE

41-579.11B Type TD-5 Class 1E Time Delay Relay
10
4.0 RELAY SETTINGS
4.1 TIMEDELAY
Time delay is selected by adjusting rheostat T.
For Zone 2 distance applications, the timer setting
shouldbesufficientto allowrelays andbreakers beyond
the next bus to clear the fault. The time should be set
toallowsuccessfulbreaker failureclearing. This usually
requiresa settingofapproximately 0.25seconds.Zone
3timing mustcoordinate withremoteZone2timing. A
typical setting is 0.5 seconds. Breaker failure timing is
set to assure normal fault clearing and fault detector
reset plus 2 to 3 cycles margin. Settings of 0.1 to 0.2
second are typical.
4.2 VOLTAGE RATING (RESISTOR - RS)
The correct tap on resistor RS should be selected for
thesupplyvoltagebeingused,pertheappropriateinternal
schematic(see Figures 5to 6). Notethat terminal1 of
the RS resistor has a red dot for ease of identification.
• 48/125 VDC relays are preset from the factory at
125 Volts.
• 24/32VDC relaysarepreset from thefactoryat 32
volts.
• Noadjustments arenecessaryfor 250VDCrelays.
4.3 TXRELAY
When the TX relay is used, the correct resistance in
serieswith thecoiloftheTXrelayhas tobeselected for
thesupply voltagebeing used.
Touse therelay witha supplyvoltageof 48or 24VDC,
move jumper JP1 on Printed Circuit Board to Position
1. This will jumper resistor R1, see Figures 2 and 6.
4.4 INDICATINGCONTACTORSWITCH(ICS)
No setting is required on the ICS.
5.0 INSTALLATION
The relays should be mounted on switchboard panels
ortheir equivalentin alocation freefromdirt,moisture,
excessivevibration,and heat. Forsemi-flushmounting,
installthe relayverticallyby meansofthe fourmounting
holes on the case flange. The mounting screws may
alsobeutilized forgrounding therelay. Externaltoothed
washersare providedfor useinthe locationsshown on
theoutline anddrillingplan (Fig.7)to facilitatemakinga
goodelectrical connectionbetween therelay case,the
mounting screws, and the relay panel. Ground Wires
shouldbeaffixed tothemountingscrews asrequiredfor
poorly grounded or insulated panels. The electrical
connectionsare madedirectly tothe relayterminals by
meansof screws(alsoprovided).
Fordetail informationontheFTcasereferto Instruction
leaflet41-076 forsemi-flushmounting.
6.0 ADJUSTMENTS AND MAINTENANCE
Note: The proper adjustments to insure correct
operation of this relay have been made at the
factory and should not be disturbed after receipt
by the customer. In particular, do not remove knob
from rheostat shaft and do not loosen the
potentiometerlock nut oradjustable resistorclamp.
Upon receipt of the relay, no customer adjustment,
other than those covered under relay settings
should be required.
6.1 ACCEPTANCECHECK
Thefollowing checkis recommendedto insurethat the
relayis inproperworkingorder. Perform atimingcheck
at minimum and maximum settings. A recommended
test circuit is shown in Figure 4. When testing the TD-
5with aTXrelaymakethe dottedconnectionasshown

Type TD-5 Class 1ETime Delay Relay 41-579.11B
11
in Figure 4. The neon lamp will light if the TX relay is
operatingproperly.
6.1.2 Indicating Contactor Switch (ICS)
Close the main relay contacts and pass sufficient dc
current through the trip circuit to close the contacts of
the ICS. This value of current should not be greater
thanthe particularICSnameplaterating. Theindicator
targetshould dropfreely.
Repeataboveexceptpass 85%ofICSnameplaterating
current. Contactsshould notpickupandtargetshould
notdrop.
6.2 ROUTINEMAINTENANCE
Allrelaysshouldbeinspectedand checkedperiodically
toassureproperoperation. Generallyavisualinspection
should call attention to any noticeable changes.
All contacts should be cleaned periodically. Acontact
burnisher S#182A836H01 is recommended for this
purpose. The use of abrasive material for cleaning
contactsis notrecommendedbecause ofthedanger of
embedding small particles in the face of the soft silver
andthusimpairingthecontact. Also,acalibrationcheck
shouldbeperformedonceayeartodetectanyelectronic
componentfailureswhich canoccuronarandom basis.
Potentiometers,tantalum capacitors,andplastic cased
semi-conductors may have a common mode failure
characteristicandroutinereplacement isrecommended
onthe followingschedule:
TantalumCapacitors C, C1 to C7 10years
Potentiometer P 5 years
Rheostat T 5 years
Diodes D1 to D6 10 years
Recalibration is necessary whenever any of these
componentsare changed.
6.3 TROUBLESHOOTINGPROCEDURE
Use the following procedure to locate the source of
troubleiftheTD-5 isnot operating correctly.
1. Inspectallwires andconnections,payingparticular
attentiontotelephonerelayandprintedcircuitboard
terminals.
2. Checkthereference voltagecircuit.This isdoneby
measuringthe dcvoltage acrossthe siliconpower
regulator,Z orZ1. Connectthe dcvoltmeter positive
terminal to the bottom terminal of RS and the
negative terminal to relay terminal 8. Apply rated
voltage per the test circuit diagram, Figure 4. The
Zenervoltageshouldbebetween11.0and14.0volts
for24/32 VDCrelays, between21.5and25.5volts
for48/125VDCrelays,andbetween50and59volts
for250 VDCrelays.
3. Check the timing capacitor voltage and the P
potentiometer brush voltage with an oscilloscope
orahigh resistancedc voltmeter.
Connectbetweenadjustableterminal ofP andrelay
terminal8.
The brush voltage, which is constant until the TR
relay trips, should be approximately one half the
reference voltage. The capacitor should gradually
change to the potentiometer brush voltage, plus
approximately one volt for silicon junction forward
voltagedrops throughSCRand D2.
4. If reference voltage, capacitor voltage, and
potentiometervoltageall appearto becorrect, the
SCR may be the cause of trouble. The anode to
cathode voltage, as measured, should be
approximately one-half the reference voltage until
thecapacitor voltagereaches theP brushvoltage,
atwhich timethe anodeto cathodevoltage should
dropto approximatelyone volt.

41-579.11B Type TD-5 Class 1E Time Delay Relay
12
7.4 INDICATING CONTRACTOR SWITCH (ICS)
1. Withtheknoboffthe shaft,set therheostat(T)
at maximum.
2. AdjustPsothat thetimesare5%to10%longer
than the maximum scale marking.
3. Set the rheostat T at minimum and check that
times are less than or equal to the minimum
scalemarking.Ifnot, adjustPslightly toreduce
times.Tighten locknutor adjustableterminal
on P.
4. Place the knob on the rheostat shaft in such a
position that the times are symmetrical with
respect tothe scaleplatemarking. Tightenthe
knob setscrew and mark calibration lines on
thescale plate.When strikingcalibrationlines
fordelays above0.5seconds,pauseat least3
seconds between readings. See Section 3.4
7.3 SCALEPLATE CALIBRATION (NEW SCALE)
If it is necessary to replace the potentiometer P or the
Printed Circuit Board, the relay should be recalibrated
witha newscale plate.Use thefollowing procedure:
Thisisdone byrotatingtherheostatshaft,without knob,
until a time delay equal to the minimum scale marking
is obtained. Then, align the knob for this delay and
tighten the knob set screw securely. Pause several
seconds between readings for all delays above .05
seconds. See section 3.4 Accuracy for discussion of
this.
Initiallyadjust ICSuniton thepedestalso thatarmature
fingersdonottouchtheyokeintherestposition, (viewed
fromtop ofswtich betweencoverand frame). Thiscan
bedoneby looseningthemountingscrewinthe molded
pedestaland movingtheICS inthedownward position.
Contact Wipe - Adjust the stationary contacts so that
bothstationarycontacts makewiththemovingcontacts
simultaneously and wipe is 1/64” to 3/64” when the
armature is against the core.
Target- Manuallyraise themoving contactsand check
to see that the target drops at the same time as the
contactsmake orupto 1/16”ahead. Thecover maybe
removedandthetabholding thetarget reformedslightly
Measure between anode of D3 and adjustable
terminal of P.
7.0 CALIBRATION
Use the following procedure for calibrating the relay if
therelayhas beentakenapart,or theadjustmentshave
been disturbed. This procedure should not be used
untilit isapparentthattherelayisnotin proper working
order. (See Acceptance Check, Section 6.1). Before
calibrating, follow the Trouble Shooting Procedure,
Section 6.3, to locate the source of trouble.
7.1 TR, TX RELAYADJUSTMENT
No adjustments are necessary.
7.2 RHEOSTAT KNOBADJUSTMENT(SAME
SCALE)
Ifitisnecessary toreplacetherheostat(T) orthesilicon
powerregulator(Z orZ1), inmost casesthe relay may
be recalibrated with the same scale plate.

Type TD-5 Class 1ETime Delay Relay 41-579.11B
13
Sub 3
187A527
Figure 4. Test Circuit for Type TD-5 Relay
To lowerthepickupcurrent useatweezer orsimilartool
andsqueeze eachleafspring approximatelyequallyby
applying the tweezer between the leaf spring and the
front surface of the cover at the bottom of the lower
window.
Pickup - The unit should pickup at 98% of rating and
notpickup at85%of rating. Ifnecessary, thecoverleaf
springs may be adjusted.
8.0 RENEWAL PARTS
Repairworkcanbedonemostsatisfactorilyatthefactory.
However, interchangeable parts can be furnished to
customerswhoareequippedfordoingrepairwork. When
orderingparts,alwaysgivethecompletenameplatedata
of the relay.
Ifthepickupislow,thefrontcover mustberemovedand
theleaf springbent outwardequally.
if necessary. However, care should be exercised so
that the target will not drop with a slight jar.

41-579.11B Type TD-5 Class 1E Time Delay Relay
14
Figure 5. Internal Schematic of TD-5 Class 1E Relay in FT-11 Case
Sub 1*
9683A64

Type TD-5 Class 1ETime Delay Relay 41-579.11B
15
Figure 6. Internal Schematic of TD-5 Class 1E Relay in FT-11 Case, with TX Relay
Sub 1*
9683A65

Printed in U.S.A.
ABBInc.
4300 Coral Ridge Drive
Coral Springs, FL 33065
TEL: [phone]
FAX: [phone]
visit our website at www.abb.com/substationautomation
Sub 4
3519A65
Figure 7. Outline and Drilling Plan for Type TD-5 Class 1E Relays in FT-11 Case
41-579.11 TypeTD-5 Class 1ETime Delay Relay