Eaton Cutler-Hammer Digitrip 520M, Instructions Manual

Page 1: ...y Current Setting 19 4 3 Long Delay Time Setting 19 4 4 Short Delay Current Setting 20 4 5 Short Delay Time Setting 20 4 6 Instantaneous Current Setting 20 4 7 Ground Fault Current Setting 21 4 8 Grou...

Page 2: ...nstalled in the breaker and can be replaced or upgraded in the field by the customer This instruction book specifically covers the application of Digitrip Trip Units as illustrated in Figure 1 1 insta...

Page 3: ...es Yes LSI LSIG WLSIG Yes Yes MLSI MLSIG MLSIA MWLSIG Yes Yes Long Long Delay Setting Delay Long Delay Time I2t at 6 x Ir Protection Long Delay Thermal Memory Fixed 1 x In Fixed 10 seconds Yes 0 4 1 0...

Page 4: ...ip 220 LI model 520 LSI model and 520M MLSI model can be used on 3 pole or 4 pole circuit breakers for the protection of the neutral circuit Only these three models can provide neutral protection alth...

Page 5: ...ip Unit Rating Plug Removal To remove the rating plug from the trip unit open the rating plug door Use a 1 8 3 mm wide screwdriver to loosen the M4 screw Pull the door to release the rating plug from...

Page 6: ...cover has an access hole for the Step button on the 520M and 520Mi units 1 6 Ground Alarm Power Supply Module 520M Models only The Ground Alarm Power Supply Module see Figure 1 4 is an optional access...

Page 7: ...age could also indicate that the trip unit is out of calibration and should be replaced at the earliest opportunity 1 8 Standards The Digitrip 220 520 and 520M Trip Units are listed by the Underwriter...

Page 8: ...ator is Figure 2 1 Tripping Circuit for a Typical Magnum Breaker Partial located under the black molded platform on which the Digitrip unit is supported The Trip Actuator contains a permanent magnet a...

Page 9: ...the three internally mounted phase current sensors Available types of neutral sensors are shown in Fig ure 2 4 Residual ground fault sensing features are adaptable to main and feeder breaker applicat...

Page 10: ...urrent viewing resistors The result ing analog voltages are digitized by the S RE chip The microcomputer continually digitizes these signals This data is used to calculate true RMS current values whic...

Page 11: ...Neutral Sensor Connections for 3200A Frame Using Residual GF Sensing Source Load K2 8 K2 9 B 4 B 6 20 1 AUX CTs 20 1 K1 3 K2 7 B 5 B 7 K1 2 Black Trip Actuator LA2 LB1 LB2 LC1 LA1 LN1 LN 2 LC 2 K1 4 K...

Page 12: ...at the PC board donut transform er 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...

Page 13: ...7 Source Ground Fault Sensing Scheme for 4000A Frame Figure 2 6 Source Ground Fault Sensing Scheme for 3200A Frame Tw o standard IA secondary sensors w ith primary in series and seconda ries in parall...

Page 14: ...g needed at system level is shown as a dotted line Capital letters represent primary current Lowercase letters represent secondary current The three breakers M1 M2 and T must all have the same breaker...

Page 15: ...mum asymmetry The Making Current Release is enabled only for the first two cycles following an initial circuit breaker closing operation The Making Current Release will trip the circuit breaker instan...

Page 16: ...rent Release Circuitry See Section 3 3 Trip Actuator LED Pulse Circuit Battery 3V Ground Alarm Power Supply Optional for 520M FET Trip See Section 1 2 Trip LED Rating Plug Integrated Circuit S RE Chip...

Page 17: ...Effective 8 13 99 Page 17 I L 70C1037H02 Figure 3 2 Digitrip 220 LI Figure 3 3 Digitrip 520 LSI Figure 3 4 Digitrip 520 LSIG Figure 3 5 Digitrip 520i WLSIG Courtesy of NationalSwitchgear com...

Page 18: ...Effective 8 13 99 Page 18 I L 70C1037H02 Figure 3 9 Digitrip 520Mi MWLSIG Figure 3 8 Digitrip 520M MLSIG Figure 3 6 Digitrip 520M MLSI Figure 3 7 Digitrip 520M MLSIA Courtesy of NationalSwitchgear com...

Page 19: ...Active position 4 0 PROTECTION SETTINGS 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 in...

Page 20: ...is specified both on the rating plug label and on the applicable time current curves referenced in Section 9 Figure 4 3 Long Time Memory LTM Jumper The action of the LTM must be considered when perfo...

Page 21: ...r I2 t response The shape selected depends on the type of selective coordi nation chosen The I2 t response will provide a longer time delay for current below 0 625 x In than will the FLAT response Fiv...

Page 22: ...st port cover to remove this item CAUTION BEFORE PLUGGING A TEST KIT INTO THE TEST PORT PLACE THE LTM JUMPER IN THE INACTIVE POSITION SEE FIGURE 4 3 AFTER TESTING RE TURN THE LTM JUMPER TO ITS ORIGINA...

Page 23: ...ush the red Reset Battery Test button to turn off the indicators the trip unit will be ready to indicate the next cause of trip WARNING PERSONAL INJURY CAN OCCUR WHEN WORKING ON POWER SYSTEMS ALWAYS T...

Page 24: ...atteries Inc CR 1 3N 300 Elmsford Boulevard Elmsford N Y 10523 914 592 2500 www varta com Duracell Inc DL 1 3N Berkshire Corporate Park Bethel CT 06801 1 800 551 2355 www duracell com Sanyo Energy Cor...

Page 25: ...eaker cell door or another visible location Figure 8 3 provides a place for recording test data and actual trip values Ideally sheets of this type should be used and maintained by those personnel in t...

Page 26: ...nce PER UNIT MULTIPLIERS Rating Plug Amperes In Ir Continuous Ampere Rating LDS x In Trip Function Per Unit Setting Multi Ampere Equivalent Setting Time Delay Inst In Long Delay In Sec Short Delay Ir...

Page 27: ...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 Ground Fault Time Date of Trip Trip Mode Indica...

Page 28: ...rm 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...

Page 29: ...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...

Page 30: ...30 I L 70C1037H02 Figure A 1 Typical Zone Interlocking Figure A 2 Typical Zone Interlocking Connections with Two Main Breakers M1 M2 and a Tie Breaker T B7 Contact B8 Contact B9 Contact Courtesy of N...

Page 31: ...f 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...

Page 32: ...Effective 8 13 99 Page 32 I L 70C1037H02 Symptom Probable Cause Possible Solution s References Courtesy of NationalSwitchgear com...

Page 33: ...Effective 8 13 99 Page 33 I L 70C1037H02 Appendix C Typical Breaker Master Connection Diagram Courtesy of NationalSwitchgear com...

Page 34: ...ANTIES EXPRESSED OR IMPLIED IN CLUDING WARRANTIES OF FITNESS FOR A PAR TICULAR PURPOSE OR MERCHANTABILITY OR WARRANTIES ARISING FROM THE COURSE OF DEALING OR USAGE OF TRADE ARE MADE RE GARDING THE INF...

Page 35: ...Effective 8 13 99 Page 35 I L 70C1037H02 Courtesy of NationalSwitchgear com...

Page 36: ...Effective 8 13 99 Page 36 I L 70C1037H02 Cutler Hammer Pittsburgh PA U S A Effective 8 13 99 Printed in U S A Courtesy of NationalSwitchgear com...