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Siemens PTS-4, Installation, Operation & Maintenance Instructions Manual

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Siemens PTS-4 Installation, Operation & Maintenance Instructions Manual Download Page 29

Repair of Static Trip Devices

35

Because of the complexity of the semi-conductor compo-
nents and circuits and because some of the components are
especially selected or matched, we do not recommend field
repair of static trip devices. Moreover, component failure
usually does not show up as visual damage and locating the
defective component or components requires specialized
techniques. Therefore, if the tests described in these instruc-
tions indicate that a static trip device or the test set itself is
defective, contact your nearest Siemens representative for
instructions on returning the unit to the factory or other
authorized service facility for repair

Summary of Contents for PTS-4

Page 1: ...Manual No SG 3138 Portable Test Set Type PTS 4 Instructions Installation Operation Maintenance ...

Page 2: ...est 14 Short Time Pick Up Test 14 Ground Pick Up Test 14 Instantaneous Pick Up Test 14 Long Time Delay Test 15 Short Time Delay Test 15 Ground Time Delay Test 15 Bench Testing Static Trip II Devices 17 TESTING FIRST GENERATION TRIP DEVICES 18 Connections Use Cord Set 18 732 184 506 18 Test Procedures 19 Bench Testing 25 Dual Device 25 TESTING LIMITRIP DEVICES 26 General 26 Connections Use Cord Set...

Page 3: ...vailable The voltage can be anywhere between 105 and 125 volts but the value should not vary by more than 1 5 during testing Static Trip III Calibration Marks Each static trip of the first generation or STATIC TRIP II type is individually calibrated during factory test Because the location of the calibration points varies from device to device it is not possible to preprint the identification lett...

Page 4: ...mperes 1 The electronic stop clock is factory calibrated at 300 seconds 5 seconds Construction Details The test set is basically a variable voltage AC supply with built in reactors to smooth the current against the trip device non linear impedance The output of the AC supply is controlled by a system of relays to start and stop the current An electronic stop clock is used to time the duration of c...

Page 5: ... the test set to operate with either the internal phase controlled current source or with an external current source 3 Internal External Power Selector Switch This switch selects the current source for the test current In the INTERNAL position the test current is controlled by the built in phase controlled current source In the EXTER NAL position the test current is controlled by an external varia...

Page 6: ...onnected to the primary winding of a small transformer rectifier combination The output of this small DC power supply is connected to the DVM INPUT ACTUATOR TEST OUTPUT terminals and the voltmeter indicates the voltage supplied by these terminals 10 Seven Point Terminal Block This terminal block is for convenience in bench testing STATIC TRIP II trip de vices The device fanning strip connects to t...

Page 7: ... cord set is also used to test the first generation trip devices A second cord set 18 732 184 507 is provided to connect to LIMITRIP style trip devices This cord set has coordinated color coding for the connec tions A third cord set 18 732 184 508 is used to connect to STATIC TRIP III devices 21 Pick Up Connection This is a four pin connector to the LEDPICK UPindicatorsforSTATICTRIPIIandLIMITRIP 2...

Page 8: ...citively coupled to the circuit breaker frame Therefore to insure against electrical shock be sure to ground the frame when testing with the circuit breaker out of the cubicle NOTE The test set isolates the power source from its output leads by an open relay contact in each line except when a test is being run In the case of excessive ground current the test set will trip out and light the ALARM l...

Page 9: ...2800 3000 3200 3400 3600 3800 4000 4000 400 600 800 1000 1200 Secondary Current Amps 25 275 30 325 35 375 40 425 45 475 50 Available Models RMS TI T Long Time and Instantaneous RMS TIG T Z Long Time Instantaneous and Ground Fault RMS TS T Z Long Time and Short Time RMS TSG T Z Long Time Short Time and Ground Fault RMS TSI T Z Long Time Short Time and Instantaneous RMS TSIG T Z Long Time Short Time...

Page 10: ...ay will indicate instantaneous trip operation 1 Select the desired phase with the phase selector switch 2 Set LONG TIME CURRENT SETTING on 5 LONG TIME BAND on 30 SHORT TIME PICK UP 12X and INSTAN TANEOUS PICK UP ON 2X ammeter on All Other Tests 3 Press the START button 4 Raise the current slowly until the relay in the test set operates This can be determined audibly and should occur at 1 0 amperes...

Page 11: ...mpere quickly to avoid oveheating Bench Testing Static Trip III Devices Connections With the static trip device away from the circuit breaker it is necessary to make connections to the fanning strip of the trip device via the connector supplied A terminal block is pro vided on the test set to facilitate this connection The end of the connector strip next to the cord must connect to terminal 1 a sp...

Page 12: ...o not drop below 0 15 amperes Again measure and record tripping time this should be approximately the same as for the first two tests Close the thermal memory switch and repeat this test in this case the device should never time out and it should be possible to continue the cycle indefinitely Remote Indicator Output Tests All STATIC TRIP Ill trip devices have a nine pin connector on the front of t...

Page 13: ...5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 1 0 0 0 1 2 0 2 0 0 4 0 0 8 0 0 1 6 0 0 8 0 0 1 0 0 0 1 2 0 0 1 4 0 0 1 6 0 0 1800 2000 1 6 0 0 2 4 0 4 0 0 8 0 0 1 6 0 0 2000A Frame 2 0 0 1 0 0 1 2 5 1 5 0 1 7 5 2 0 0 2 2 5 2 5 0 2 5 0 5 0 1 0 0 2 0 0 RL 2000 4 0 0 2 0 0 2 5 0 3 0 0 3 5 0 4 0 0 4 5 0 5 0 0 5 0 0 6 0 1 0 0 2 0 0 4 0 0 RLF 2000 8 0 0 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 1 0 0 0 1 0 0 0 1 2 0 2...

Page 14: ...r Therefore to insure against electrical shock be sure to ground the frame when testing with the circuit breaker out of the cubicle NOTE The test set isolates the power source from its output leads by an open relay contact in each line except when a test is being run In the case of excessive ground current the test set will trip out and light the ALARM light Connections Use Cord Set 1 8 732 1 84 5...

Page 15: ...ly should cause the light to go OUT 6 Repeat the tests for the other phases and settings and compare with Table 2 Short Time Pick Up Test 1 Connect the yellow TP 4 pin plug to the TP 4 terminal of the trip device the black pin plug to TP 1 the green plug to terminal 1 and the white plug to terminal 9 2 Set LONG TIME PICK UP on A INSTANTANEOUS fully counterclockwise LONG TIME BAND on 6 and SHORT TI...

Page 16: ...imately the same as shown on the faceplate of the device but must be within the limits shown on the curves If not recheck all settings and repeat the test 7 Repeat steps 5 and 6 one or more times to verify the test results 8 Repeat for the other phases by changing green plug to terminal 2 for phase 2 and terminal 3 for phase 3 time delay bands and other values of current as desired All test points...

Page 17: ...gs if desired Make current adjustments above 1 ampere quickly to avoid overheating Bench Testing Static Trip II Devices Connections With the static trip device away from the circuit breaker it is necessary to make connections directly to the fanning strip of the trip device A terminal block is provided on the test set to facilitate this connection Simply connect the fanning strip to the terminal b...

Page 18: ...od els no long time band adjustment is available and the device is marked to show which time band it contains 3 The Instantaneous Pick Up is Table 3 Breaker Type Models A3 AG2 4WAG D2 DG1 4WDG Tripping Transformer Group No Models AG2 and DG1 Models 4WAG and 4WDG Long Time Delay Elements Available Pick Up Settings Amperes Long Time Delay Element Available Ground Fault Settings Amperes Inst or Short...

Page 19: ...es the reference dots are red and the calibration dots are black on some models and white on others NOTE Once pickup has been verified disconnect the indicators for Time Delay Testing The indicators can load the circuit and prevent the trip device from timing out Test Procedures Keeping the above differences in mind and making careful reference to the appropriate connection diagram in Figure 9 thr...

Page 20: ...ted The time delay band is selected and set at the factory it is not field adjustable Available time delays are minimum intermediate and maxi mum MODEL AG optional provides phase overcurrent protec tion plus sensitive ground fault overcurrent protection for systems with phase to phase loading Ground current pick up settings are independent of the phase pick up settings and continuously adjustable ...

Page 21: ... that fault current flows including arcing time 7 Instantaneousmaximuminterruptingtimemaybegreater when breakers are closed in on a fault depending on actual fault conditions The maximum potential increase for a 3 phase fault is 0 01 seconds and for a single phase ground fault is 0 02 seconds Connections Use Cord Set 1 8 732 1 84 507 The connections for the Limitrip trip devices are made with an i...

Page 22: ...open 1 Make all connections as described in the preceding section CONNECTIONS 2 Set LONG TIME PICK UP on A by closing depressing the numbered end of the LONG TIME PICK UP switch labeled A in the Limitrip Place the trip device test set selector switch to STATIC TRIP TEST position Set the range switch on LOW Set the POWER selector switch to INTERNAL 3 Turn the test set ON The red digits of the meter...

Page 23: ...test the operation of the circuit breaker any of the above tests can be run with the circuit breaker closed allowing the trip device to open the circuit breaker when it operates It may be desirable to discon nect either the red or black banana plug from the jack assembly to assure that the relay in the test set does not interrupt the current before the circuit breaker can open thus confusing the t...

Page 24: ...S of INTERMEDIATE Band 3 Compare with Figure 20 The other phases and different values of current can be tested if desired Make current settings as quickly as possible to avoid overheat ing Bench Test Limitrip Devices To bench test Limitrip devices follow the same procedures previously indicated for testing on the breaker The following adjustments in procedure and comments should be noted The allig...

Page 25: ... Connect an external Variac to the test set external input terminals and set the input power selector switch to EXTERNAL Check the ammeter at several values of current on both the high and low ranges The two ammeters should agree within approxi mately 3 of full scale for all readings 5 If pick up settings meet design tolerance and the time delays do not the stop clock may be a fault This can be ch...

Page 26: ...SING AND OR OPENING SPRINGS MUST BE RESPECTED ALWAYS DISCHARGE ALL SPRINGS BEFORE PLAC ING HANDS NEAR THE MECHANISM See the circuit breaker instruction book if any problem is evident in the mechanical portion 7 Measure the actuator coil resistance This measurement should be made with the static trip disconnected from the actuator There are three types of actuators of the sealed type One has a resi...

Page 27: ...formers exhibit evidence of overheat ing or other damage a simple continuity test of the wiring and the transformer winding may be all that is required For transformers rated 1000 1 and above an exciting current test can be inconclusive due to the low level of current involved and in the case of some of the windings used with the Limitrip devices continuity is the only test that can be run due to ...

Page 28: ...Ratio Voltage RMS Exciting Current RMS 80 1 4 6 0 25 200 1 7 0 0 15 400 1 17 0 0 05 600 1 32 0 0 05 800 1 34 0 0 03 1000 1 and up 34 0 0 02 Table 7 Static Trip II R L Style Tripping Transformer Tripping Exciting Maximum Transformer Rating Voltage RMS Exciting Current RMS 80 1 30 0 25 150 1 40 0 15 200 1 45 0 15 250 1 50 0 15 400 1 70 0 05 600 1 100 0 05 800 1 100 0 03 1000 1 and up 134 0 02 Table ...

Page 29: ...ices Moreover component failure usually does not show up as visual damage and locating the defective component or components requires specialized techniques Therefore if the tests described in these instruc tions indicate that a static trip device or the test set itself is defective contact your nearest Siemens representative for instructions on returning the unit to the factory or other authorize...

Page 30: ...Siemens Energy Automation Inc Switchgear and Motor Control Business P O Box 29503 Raleigh NC 27626 919 365 6660 ...

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