Eaton Cutler-Hammer Digitrip 520MC User manual

EATON CORPORATION Cutler-Hammer InformationSheets 70C1454H02 1
Digitrip 520MC with
Maintenance Mode
FIGURE 1. Digitrip 520MC with ARMs in Magnum Circuit Breaker
Effective May 2006
I.S70C1454
Supplement to I.L. 70C1037
Table of Contents
1.0 General ................................................................... 2
2.0 Maintenance ModeSettings.................................... 2
3.0 ArmingMaintenanceMode...................................... 2
4.0 Remote Indicator ..................................................... 3
5.0 Choosingthe Reduction Setting .............................. 4
6.0 TrippingandTesting ................................................ 4
WiringDiagram ............................................................... 5
Manufacturer’s Statement ............................................... 6
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2EATON CORPORATION Cutler-Hammer Information Sheets 70C1454H02
1.0 General
Perthe above WARNING,itis highly recommended that
maintenancebe conducted onelectrical equipment
includingcircuit breakers with the system de-energized.
For situations that arise where this is not possible, the
MaintenanceMode function ofthe Digitrip 520MCfamily
(cat5ARMLSI, 5ARMLSIG,5ARMLSIA)can reduceArc
Flash incident energy that is generated on a fault condi-
tion. This is accomplished by a analog trip circuit which,
whenarmed, providesa fast acting response to the fault.
Thereduced arccondition willoccur only in devices
downstream of the trip unit in Maintenance Mode. This is
separatefrom the normalsystem protection setting of
Instantaneous.The Maintenance Mode is located in the
upper, white portion ofthe unit.
2.0 Maintenance Mode Settings
TheMaintenance Mode Settings (labeled R5,R4, R3,R2,
R1) provide theArc Flash Reduction setting. R5 is the
Maximum reduction setting which correlates to the lowest
pickupvalue.
NominalTrip current ofMaintenance Mode Settings
Setting R5 2.5x Rating Plug Amperes
SettingR4 4.0x Rating Plug Amperes
SettingR3 6.0x Rating Plug Amperes
SettingR2 8.0x Rating Plug Amperes
SettingR1 10x Rating Plug Amperes
3.0 Arming Maintenance Mode
Thereare threeways toarm the Maintenance ModeArc
Flash Reduction setting. One method is locally via the two
position switch in the Maintenance Mode section of the
trip unit. Turning the switch to the ON position will arm
the setting selected.Ablue LED confirms that the
function is on.
WARNING
ONLYCERTIFIEDANDCOMPETENTPERSONNEL
SHOULDATTEMPT TO INSTALL OR MAINTAIN
POTENTIALLYHAZARDOUS EQUIPMENT.
DO NOTATTEMPT TO INSTALLOR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS
ENERGIZED.DEATH OR SEVEREPERSONALINJURY
CANRESULT FROM CONTACT WITH ENERGIZED
EQUIPMENT.ALWAYS VERIFY THAT NO VOLTAGE IS
PRESENTBEFOREPROCEEDING.ALWAYSFOLLOW
SAFETYPROCEDURES.
EATON IS NOT LIABLE FOR THE MISAPPLICATION
OR MISINSTALLATION OF ITS PRODUCTS.
CAUTION
AFLASH HAZARDANALYSIS SHOULD BE DONE TO
DETERMINEPERSONAL PROTECTIVE EQUIPMENT
REQUIREMENTS
CAUTION
OBSERVEALLRECOMMENDATIONS,NOTES,CAU-
TIONS,AND WARNINGS RELATING TO THE SAFETY
OFPERSONNELAND EQUIPMENT. OBSERVEAND
COMPLYWITHALL GENERALAND LOCAL HEALTH
ANDSAFETYLAWS, CODES,AND PROCEDURES.
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EATON CORPORATION Cutler-Hammer InformationSheets 70C1454H02 3
FIGURE 2. Digitrip 520MC with ARMs
Forthe othertwo methods of arming the Maintenance
Mode function, this switch must be in the position labeled
0/1.With this setting, a remote switch wired through the
breaker secondary contacts can remotely arm the
Maintenace Mode setting.Ahigh quality, gold plated or
palladiumcontact isrequired in this application.The blue
LEDwill verifythat the function is armed. (See wiring
diagramonpage five.)
A third method to arm the maintenance setting is via a
communication device.APalm Pilot along with an IR Mint
device can be employed to arm the setting. By initiating
the ENABLE setting, the Maintenance Mode selection in
the control screen of the Palm, Maintenance Mode is set.
Thereis a confirmationscreen thatverifies the arming.A
BIM(BreakerInterface Module) isanother communcation
method to arm the setting. When Maintenance Setting is
enabledvia devicecommunications, thissetting mustbe
disabledby device communications.
4.0 Remote Indicator
TheMagnum circuit breaker will bewired withsecondary
contactsA9 andA12. Circuit breakers built after
September2005have a normallyopencontactavailable for
customer use. This contact can be used to indicate
remotely that the Maintenance setting is armed. Refer to
diagramon page three for awiring ofthis remote (blue
light)indicator.
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4EATON CORPORATION Cutler-Hammer Information Sheets 70C1454H02
5.0 Choosing the Reduction Setting
TheArc Flash Maintenance Switch is an eight position
rotary switch that has five unique settings. Setting R5 is
repeated four times. From the factory, the Magnum circuit
breaker is shipped with the Digitrip unit set to the R5
setting and with its arming switch set to the 0/1 position.
The 0/1 position means that it is locally OFF, but can be
remotelyturned ON. Theblue LED, ifilluminated, provides
indication that the Maintenance Mode setting is armed per
one of the three methods described in section 3.0.
Ingeneral, the selection of one of the Reduction Settings
(R5through R1) should be determinedand selectedby a
person who is experienced in power system analysis.
This setting choice normally does not change unless there
are future system modifications that could increase or
decreasefault levels at the circuit breaker location.
6.0 Tripping and Testing
TheMaintenanceMode function willprovidefast tripping
evenwhen theregular Instantaneousis set to OFF.The
Instantaneous LED position is also used to indicate a trip
initiatedby theMaintenance Modesetting. TheLCD
display, if powered, will indicate this with four dashes.
TheMaintenance setting, externalwiring (ifany) and
trippingfunctionalityshould beperiodicallyverified by
primaryor secondaryinjection currenttesting.
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EATON CORPORATION Cutler-Hammer InformationSheets 70C1454H02 5
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6EATON CORPORATION Cutler-Hammer Information Sheets 70C1454H02
Eaton Electrical, Inc.
1000 Cherrington Parkway
Moon Township, PA 15108-4312
United States
Tel.: [phone]
www.EatonElectrical.com
DISCLAIMEROFWARRANTIESAND
LIMITATION OF LIABILITY
Theinformationrecommendations,descriptions and
safety notations in this document are based on Eaton’s
experienceand judgment and may notcover allcontin-
gencies. Iffurther informationis required an Eaton sales
officeshould be consulted.
Sale of the product shown in this literature is subject to
theterms and conditions outlined in appropriate Eaton
Electrical Inc. selling policies or other contractual agree-
mentbetween Eaton andthe purchaser.
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EATONELECTRICALINC. THE CONTENTSOFTHIS
DOCUMENTSHALLNOTBECOME PARTOF OR
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CONTRACT,INTORT(INCLUDING NEGLIGENCE),
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SPECIAL,INDIRECT,INCIDENTALOR
CONSEQUENTIALDAMAGEORLOSSWHATSOEVER,
INCLUDING BUT NOT LIMITED TO DAMAGE TO OR
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CUSTOMERS RESULTING FROM THE USEOF THE
PRODUCTSORINFORMATION, RECOMMENDATIONS
ANDDESCRIPTIONS CONTAINED HEREIN.
© 2006 Eaton Corporation
All Rights Reserved
Printed in USA
Publication No. I.S.70C1454H02
May 2006
Cutler-Hammer is a federally
registered trademark of Eaton
Corporation. Digitrip is a trade-
mark of Eaton Corporation.
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