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Effective 7/1/2003

Page 35

I.L. 70C1037H04

Appendix B Troubleshooting Guide

Symptom

Probable Cause

Possible Solution(s)

References

Current through breaker is
<25% of sensor rating.

No problem. Status LED will
not operate with breaker
currents <25% of sensor
rating.

Unit status LED is not
blinking.

Trip unit is malfunctioning.

Replace trip unit.

Light loading.

No problem. Status LED will
not flash until 25% of sensor
rating.

See Section 3.2 Note.

Unit status LED is steady on.

Trip unit is malfunctioning.

Replace trip unit.

Rating plug is not installed or
is loose.

Install rating plug and/or
check for loose connections.

Rating plug is open internally.

Replace rating plug.

As soon as current starts to
flow through the breaker, it
trips and the Instantaneous
trip LED comes on.

Trip unit is malfunctioning.

Replace trip unit.

Battery installed backwards.

Install correctly.

Dead battery.

Replace battery.

LED does not come on when
battery check button is
pressed or Cause of Trip does
not light after a trip via Digitrip.

Trip unit is malfunctioning.

Replace trip unit.

There actually is a ground
fault.

Find location of the fault.

On 4-wire residual systems,
the neutral current sensor
may not have the correct ratio
or be properly connected.

Check connections at
terminals B4 and B5. Check
that the neutral current sensor
ratio matches the breaker.
Check that the connections
from the neutral current
sensor to the breaker are not

reversed. Check B6, B7 for
correct programming of
jumper.

See Section 2.3, Notes.

Trip unit is malfunctioning.

Replace trip unit.

Breaker trips on ground fault.

High inrush phase currents
may cause fictitious ground
pickup momentarily.

Connect Zout to Zin jumper to
provide some time delay.

See Caution in Section 3.4

Connection from Zout to Zin is
missing.

Make connections B8 to B9.

Refer to Appendix A.

Trip unit settings are not
correct.

Change settings.

Breaker trips too rapidly on
ground fault or short delay
(Zone Selective Interlocking
not used).

Trip unit is malfunctioning.

Replace trip unit.

Long Time Memory function.

Disable Long Time Memory.

Refer to Section 4.3.

Breaker trips too rapidly on
long delay.

Trip unit settings are not
correct.

Change settings. Long Time
Delay setting is based on
6

Courtesy of NationalSwitchgear.com

Содержание Cutler-Hammer Magnum Digitrip 220+

Страница 1: ...9 2 Remote Master Computer 24 4 9 3 INCOM Network Interconnections 24 5 0 Test Procedures 25 5 1 General 25 5 2 When to Test 25 5 3 Functional Field Testing 25 5 3 1 Field Test Kit 25 5 3 2 Handheld...

Страница 2: ...d can be replaced or upgraded in the field by the customer This instruction book specifically covers the application of Digitrip Trip Units see Figure 1 1 installed in Magnum and Magnum DS Breakers Th...

Страница 3: ...Delay Time I2t at 6 x Ir Protection Long Delay Thermal Memory 0 4 1 0 x In 2 24 Seconds Yes 0 4 1 0 x In 2 24 Seconds Yes 0 4 1 0 x In 2 24 Seconds Yes 0 4 1 0 x In 2 24 Seconds Yes Short Short Delay...

Страница 4: ...Alarm NA X X X Remote Messages Trip Long Delay Trip X X X X Short Delay Trip X X X X Instantaneous Trip X X X X Ground Trip NA X NA X Over temperature Trip X X X X Plug Trip plug problem X X X X MCR...

Страница 5: ...1 and 520MC CLSI model Fig 3 4 1 can be used on 3 pole or 4 pole circuit breakers for the protection of the neutral circuit Only these four models can provide neutral protec tion although models MLSI...

Страница 6: ...e door to release the rating plug from the trip unit To remove the trip unit from the circuit breaker deflect the spring clip to release the unit from the steel mounting plate Pull the unit to disenga...

Страница 7: ...splay data until load current reaches approxi mately 30 1 phase or 10 3 phase of the In rating 1 6 2 Ground Alarm A second function of the module is to provide either a ground trip or ground alarm onl...

Страница 8: ...hest value that can be presented is 9999 Any fault currents greater than this value will be shown as HI Pushing the Reset pushbutton will clear this data Also related to the phase value after a trip e...

Страница 9: ...INJURY Figure 2 1 Tripping Circuit for a Typical Magnum Breaker Partial OBSERVE POLARITY MARKINGS ON THE TRIP AC TUATOR LEADSAND CONNECT THEM PROPERLY USING THE INSTRUCTIONS PROVIDED 2 2 Low Energy Tr...

Страница 10: ...ION IF THE SENSOR CONNECTIONSARE INCORRECT A NUISANCE TRIP MAY OCCUR ALWAYS OBSERVE THE POLARITY MARKINGS ON THE INSTALLATION DRAW INGS TO INSURE CORRECT GROUND FAULT EQUIP MENT PERFORMANCE CONDUCT FI...

Страница 11: ...ed Processor chip The microcomputer continually digitizes these signals This data is used to calculate true RMS current values which are then continually compared with the protection function settings...

Страница 12: ...1 3 3 2 2 1 1 K2 8 B 4 Load Notes B 6 K1 4 K1 3 10 1 10 1 AUX CT K2 9 K2 1 K2 7 B 5 B 7 K1 5 K1 2 Black Trip Actuator LB LC LA K1 6 K1 7 K1 8 K1 9 1 1 1 Source Load K2 8 K2 9 B 4 B 6 20 1 AUX CTs 20 1...

Страница 13: ...at the PC board donut transformer to sense ground fault via element R 5 Do not jumper on secondary contacts B 6 B 7 This will defeat all ground fault protection in application for 4 pole breaker Grou...

Страница 14: ...Effective 7 1 2003 Page 14 I L 70C1037H04 Figure 2 6 Source Ground Fault Sensing Scheme for 3200A Frame Figure 2 7 Source Ground Fault Sensing Scheme for 4000A Frame Courtesy of NationalSwitchgear com...

Страница 15: ...N N Digitrip Ground Sensor Breaker M2 trips since this is the only breaker seeing the I fault via element R No jumper on B 6 B 7 terminals all breakers are programmed for standard Residual Ground Faul...

Страница 16: ...o cycles following an initial circuit breaker closing operation The Making Current Release will trip the circuit breaker instantaneously and flash the Instantaneous LED 3 4 Zone Interlocking 520 famil...

Страница 17: ...See Section 3 3 Trip Actuator LED Pulse Circuit Battery 3V Ground Alarm Power Supply Optional for 520M Required for 520MC FET Trip See Section 1 2 Trip LED Rating Plug Integrated Processor C ip H TM...

Страница 18: ...Effective 7 1 2003 Page 18 I L 70C1037H04 Figure 3 2 1 Digitrip 220 PLI Figure 3 2 3 Digitrip 520 LSIG Figure 3 2 2 Digitrip 520 LSI Figure 3 2 4 Digitrip 520i WLSIG Courtesy of NationalSwitchgear com...

Страница 19: ...tive 7 1 2003 Page 19 I L 70C1037H04 Figure 3 3 1 Digitrip 520M MLSI Figure 3 3 3 Digitrip 520M MLSIG Figure 3 3 2 Digitrip 520M MLSIA Figure 3 3 4 Digitrip 520Mi MWLSIG Courtesy of NationalSwitchgear...

Страница 20: ...ive 7 1 2003 Page 20 I L 70C1037H04 Figure 3 4 1 Digitrip 520MC CLSI Figure 3 4 2 Digitrip 520MC CLSIA Figure 3 4 3 Digitrip 520MC CLSIG Figure 3 4 4 Digitrip 520MC CWLSIG Courtesy of NationalSwitchge...

Страница 21: ...S 4 1 General Before placing any circuit breaker in operation set each trip unit protection setting to the values specified by the engineer responsible for the installation The number of settings that...

Страница 22: ...er The action of the LTM must be considered when performing multiple Long Delay Time tests See Section 5 4 4 4 Short Delay Current Setting There are 8 available Short Delay Current Settings as illustr...

Страница 23: ...Settings 4 9 INCOM Digitrip 520MC Models only INCOM communication to a host computer or a BIM is possible with the Digitrip 520MC unit The address range is 001 through 999 The factory default address...

Страница 24: ...e it and display it in a useful manner Following an over current trip operation the sequence of coded data varies slightly The cause of trip the value the phase or ground current responsible for the t...

Страница 25: ...he Magnum Test KitAdapter 8779C02G04 can be used to test the trip unit and breaker 5 0 TEST PROCEDURES 5 1 General WARNING DO NOT ATTEMPT TO INSTALL TEST OR PERFORM MAINTENANCE ON EQUIPMENT WHILE IT I...

Страница 26: ...rd in the Test Kit and serve to power up the display on the 520M trip unit LED s A and B function to represent sufficient battery voltage from both the single Lithium cell and the six Alkaline batteri...

Страница 27: ...ved from the Cell Apply the same current as described above through any two phases of the breaker The breaker should not trip and the alarm indicator if one is supplied should not operate Repeat the t...

Страница 28: ...d then replace battery See Figure 6 1 This will activate the battery Check the battery status by depressing the battery test pushbutton 6 2 Battery Check The battery is a long life lithium camera type...

Страница 29: ...tion of the protection function of the breaker without affecting its short circuit current capability For the Digitrip 520 family of trip units this is implemented by changing the current sensors and...

Страница 30: ...TTINGS Circuit No Address Breaker Shop Order Reference PER UNIT MULTIPLIERS Rating Plug Amperes In Ir Continuous Ampere Rating LDS x In Trip Function Per Unit Setting Multi Ampere Equivalent Setting T...

Страница 31: ...uit No Address Breaker Shop Order Reference Settings Reference Trip Function Orig 0 Rev 1 Rev 2 Rev 3 Instantaneous Long Delay Setting Long Delay Time Short Setting Short Time Ground Fault Setting Gro...

Страница 32: ...orm GROUND FAULT TEST RECORD FORM Ground Fault Test Record should be retained by those in charge of the building s electrical installation in order to be available to the authority having jurisdiction...

Страница 33: ...to the feeder trip unit the feeder will send a restraint interlocking signal to Z1 Main and feeder trip units will begin to time out and in the event that the branch breaker does not clear the fault t...

Страница 34: ...m power conductors DO NOT GROUND any Zone Interlocking wiring The maximum distance between two farthest breakers on different zones from the ZO downstream to ZI upstream terminals is 250 feet 76m A ma...

Страница 35: ...lfunctioning Replace trip unit There actually is a ground fault Find location of the fault On 4 wire residual systems the neutral current sensor may not have the correct ratio or be properly connected...

Страница 36: ...ently adding Aux Power and then depress Reset pushbutton to fully clear trip buffer See also Note in Section 5 3 2 2 Light load Check breaker ordering information Refer to Sections 1 6 and 1 6 1 LCD D...

Страница 37: ...Effective 7 1 2003 Page 37 I L 70C1037H04 Appendix C Typical Breaker Master Connection Diagram Courtesy of NationalSwitchgear com...

Страница 38: ...mon and SHielD Three Baud rates of 1200 9600 or 19200 are selectable via programming switch for the MODBUS network The INCOM Baud rate is fixed at 9600 Baud B 2 B 1 1 Magnum Breaker 2 B 2 B 1 Magnum B...

Страница 39: ...RRANTIES EXPRESSED OR IMPLIED INCLUD ING WARRANTIES OF FITNESS FORAPARTICULAR PURPOSE OR MERCHANTABILITY OR WARRANTIES ARISING FROM THE COURSE OF DEALING OR US AGE OF TRADE ARE MADE REGARDING THE INFO...

Страница 40: ...Effective 7 1 2003 Page 40 I L 70C1037H04 Cutler Hammer Pittsburgh PAU S A Effective 7 1 2003 Printed in U S A Courtesy of NationalSwitchgear com...

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