Eaton Cutler-Hammer Digitrip 520M User Manual

Effective 8/13/99
Page 1I.L. 70C1037H02
Instructions for Digitrip Models 220, 520, 520i, 520M, and
520Mi Trip Units for use only in Cutler-Hammer Magnum
and Magnum DS Circuit Breakers
Table of Contents
1.0 General Description of Digitrip Trip Units................ 2
1.1 Protection ............................................................... 4
1.2 Mode of Trip and Status Information....................... 4
1.3 Installation and Removal ........................................ 4
1.3.1 Installation of the Trip Unit ........................... 4
1.3.2 Rating Plug Installation................................ 4
1.3.3 Trip Unit/Rating Plug Removal .................... 5
1.4 Wiring ..................................................................... 6
1.5 Plexiglass Cover..................................................... 6
1.6 Ground Alarm/Power Supply Module
(520M Models only) ................................................ 6
1.6.1 Auxiliary Power............................................ 6
1.6.2 Ground Alarm.............................................. 6
1.7 Display Feature (520M family only)......................... 7
1.8 Standards ............................................................... 7
2.0 General Description of
Magnum Circuit Breakers ....................................... 7
2.1 General .................................................................. 7
2.2 Low Energy Trip Actuator ....................................... 8
2.3 Ground Fault Protection ......................................... 8
2.3.1 General ....................................................... 9
2.3.2 Residual Sensing ........................................ 9
2.3.3 Source Ground Sensing .............................. 9
2.3.4 Zero Sequence Sensing .............................. 9
2.3.5 Multiple Source/Multiple Ground.................. 9
2.3.6 Ground Fault Settings ................................. 9
2.4 Current Sensors (Magnum Frames less than
or equal to 3200A) ................................................ 10
2.5 Current Sensors (Magnum Frames greater
than 3200A) .......................................................... 10
3.0 Principles of Operation ......................................... 10
3.1 General ................................................................ 10
3.2 Trip and Operation Indicators ............................... 15
3.3 Making Current Release ....................................... 15
3.4 Zone Interlocking (520 family only) ....................... 15
4.0 Protection Settings ............................................... 19
4.1 General ................................................................ 19
4.2 Long Delay 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 Ground Fault Time Delay Setting.......................... 21
5.0 Test Procedures ................................................... 21
5.1 General ................................................................ 21
5.2 When to Test ........................................................ 22
5.3 Functional Field Testing ........................................ 22
5.4 Performance Testing for Ground Fault
Trip Units .............................................................. 22
5.4.1 Code Requirements .................................. 22
5.4.2 Standards Requirements........................... 22
5.4.3 General Test Instructions........................... 22
6.0 Battery ................................................................. 23
6.1 General ................................................................ 23
6.2 Battery Check ....................................................... 23
6.3 Battery Installation and Removal .......................... 24
7.0 Frame Ratings
(Sensor Ratings and Rating Plugs)................ 10, 24
8.0 Record Keeping.................................................... 25
9.0 References ........................................................... 25
9.1 Magnum and Magnum DS Circuit Breakers ......... 25
9.2 Time-Current Curves ............................................ 25
Appendix A Zone Interlocking Examples ...................... 29
Appendix B Troubleshooting Guide .............................. 31
Appendix C Typical Breaker Master
Connection Diagram ............................................. 33
WARNING
DO NOT ATTEMPT TO INSTALL OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED. DEATH OR SEVERE PERSONAL INJURY
CAN RESULT FROM CONTACT WITH ENERGIZED
EQUIPMENT. ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENT BEFORE PROCEEDING. ALWAYS FOLLOW
SAFETY PROCEDURES. CUTLER-HAMMER IS NOT
LIABLE FOR THE MISAPPLICA-TION OR
MISINSTALLATION OF ITS PRODUCTS.
WARNING
OBSERVE ALL RECOMMENDATIONS, NOTES,
CAUTIONS, AND WARNINGS RELATING TO THE
SAFETY OF PERSONNEL AND EQUIPMENT. OB-
SERVE AND COMPLY WITH ALL GENERAL AND
LOCAL HEALTH AND SAFETY LAWS, CODES, AND
PROCEDURES.
I.L. 70C1037H02
Courtesy of NationalSwitchgear.com

Eaton Cutler-Hammer Digitrip 520M Specifications

General

Category	Circuit Breakers
Manufacturer	Eaton Cutler-Hammer
Voltage Rating	600V
Interrupting Rating	65kA
Protection Features	Overcurrent, Ground fault, Short circuit
Display	LCD
Communication	Modbus
Standards	UL, CSA, IEC
Application	Commercial and Industrial

Summary

1.0 General Description of Digitrip Trip Units

1.1 Protection

Details the protective functions provided by the Digitrip Trip Unit and its operation.

1.2 Mode of Trip and Status Information

Explains how to interpret trip indications and status via LEDs and the trip unit's operation.

1.3 Installation and Removal

Provides instructions for installing and removing the Digitrip Trip Unit and its rating plug.

1.3.3 Trip Unit/Rating Plug Removal

Details the step-by-step process for removing the trip unit and rating plug from the breaker.

1.4 Wiring

Diagrams the internal wiring of the breaker and connections for the trip unit.

1.6 Ground Alarm/Power Supply Module

Details the optional module for auxiliary power and ground alarm functions on 520M models.

1.7 Display Feature (520M family only)

Explains the metering and display functions of the 520M/520Mi Digitrip units.

2.0 General Description of Magnum Circuit Breakers

2.2 Low-Energy Trip Actuator

Describes the mechanism that initiates the breaker trip action based on Digitrip signals.

2.3 Ground Fault Protection

Details the various sensing modes and features for ground fault detection.

2.3.1 General

Discusses system characteristics and breaker application for ground fault sensing.

2.3.2 Residual Sensing

Explains the standard mode of ground fault sensing using phase and neutral sensors.

2.3.3 Source Ground Sensing

Describes sensing schemes for ground fault protection in radial or double-ended systems.

2.3.4 Zero Sequence Sensing

Explains zero sequence sensing for mains, feeders, and special schemes.

2.3.5 Multiple Source/Multiple Ground

Illustrates a scheme for detecting ground faults with multiple return paths.

2.3.6 Ground Fault Settings

Discusses ground fault functional settings (FLAT/I²t) and their effects.

2.4 Current Sensors (Magnum Frames less than or equal to 3200A)

Explains the internal primary current sensors for frames up to 3200A.

2.5 Current Sensors (Magnum Frames greater than 3200A)

Describes the internal current sensors for frames exceeding 3200A.

3.0 Principles of Operation

3.1 General

Overview of Digitrip operation, temperature considerations, and the SURE+chip.

3.2 Trip and Operation Indicators

Explains the meaning and function of the LEDs on the Digitrip unit for status and trip events.

3.3 Making Current Release

Describes the safety feature that prevents closing on a faulted circuit.

3.4 Zone Interlocking (520 family only)

Details the Zone Selective Interlocking feature for coordinated tripping.

4.0 Protection Settings

4.1 General

Instructions on setting Digitrip protection parameters using rotary switches.

4.2 Long Delay Current Setting

Defines the range and multiples of (Ir) for the Long Delay current setting.

4.3 Long Delay Time Setting

Specifies the available time delay settings for Long Delay at 6x(Ir).

4.4 Short Delay Current Setting

Details the available settings for Short Delay current in multiples of (Ir).

4.5 Short Delay Time Setting

Explains the FLAT and I²t response time delay settings for Short Delay.

4.6 Instantaneous Current Setting

Covers the available instantaneous trip settings in multiples of (In).

4.7 Ground Fault Current Setting

Lists the available ground fault current settings in multiples of (In).

4.8 Ground Fault Time Delay Setting

Describes the FLAT and I²t response time delay settings for ground fault.

5.0 Test Procedures

5.1 General

Safety precautions and general guidelines for testing Digitrip trip units and breakers.

5.2 When to Test

Recommends the appropriate timing and conditions for performing tests.

5.3 Functional Field Testing

Details how to perform functional tests using approved test kits to verify performance.

5.4 Performance Testing for Ground Fault Trip Units

Covers requirements and procedures for performance testing of ground fault protection.

6.0 Battery

6.1 General

Explains the role of the battery in maintaining trip indication on 520 family units.

6.2 Battery Check

Provides instructions on how to check the battery status and when to replace it.

6.3 Battery Installation and Removal

Details the procedure for safely replacing the lithium cell battery.

7.0 Frame Ratings (Sensor Ratings and Rating Plugs)

8.0 Record Keeping

9.0 References

9.1 Magnum and Magnum DS Circuit Breakers

Lists instruction books for Magnum and Magnum DS circuit breakers.

9.2 Time-Current Curves

References the specific time-current curves available for Digitrip trip unit models.

Appendix A Zone Interlocking Examples

Appendix B Troubleshooting Guide

Appendix C Typical Breaker Master Connection Diagram