Effective 8/2006
Page 18
I.L. 66A7534H04
WARNING
ANY TRIPPING OPERATION WILL CAUSE DISRUPTION
OF SERVICE AND POSSIBLE PERSONAL INJURY,
RESULTING IN THE UNNECESSARY SWITCHING OF
CONNECTED EQUIPMENT.
CAUTION
TESTING A CIRCUIT BREAKER WHILE IT IS IN-SER-
VICE AND CARRYING LOAD CURRENT IS NOT RECOM-
MENDED.
TESTING OF A CIRCUIT BREAKER THAT RESULTS IN
THE TRIPPING OF THE CIRCUIT BREAKER SHOULD
BE DONE ONLY WITH THE CIRCUIT BREAKER IN THE
TEST OR DISCONNECTED CELL POSITIONS OR
WHILE THE CIRCUIT BREAKER IS ON A TEST BENCH.
5.2 When to Test
For Draw-Out Breakers, testing of the Digitrip trip unit prior
to start-up can best be accomplished with the circuit
breaker out of its cell or in the Test, Disconnected, or
Withdrawn (or Removed) cell positions.
NOTE:
Since time-current settings are based on desired
system coordination and protection schemes, the protec-
tion settings selected and preset in accordance with
Section 4.0 should be reset to their as-found conditions if
altered during any routine test sequence.
Model Test
Kit
Digitrip 520V
and 520MCV
Test Kit (140D481G02R, 140D481G02RR,
140D481G03, or G04) with Test Kit Adapter
8779C02G04
5.3 Functional Field Testing
5.3.1 Field Test Kit
Use the test receptacle to verify a functional load test of a
major portion of the electronic circuitry of the Digitrip trip
unit and the mechanical trip assembly of the circuit
breaker. The testing can determine the accuracy of the
desired trip settings by performing Long Delay, Short
Delay, and Ground Fault functional tests. The Cutler-
Hammer approved test kit is listed below.
The test port is located on the front left-hand corner of the
trip unit
(See Figure 1.1)
. To access the port, remove the
plexiglass cover from the front of the circuit breaker. Using
a small screwdriver, gently pry up on the test 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 ORIGINAL POSITION.
The test kit authorized by Cutler-Hammer for use with the
Digitrip 520V and 520MCV, plugs into the test port of the
trip unit and provides a secondary injection AC test current
that simulates the CH Type-V current sensors. Test kits
styles 140D481G02R, 140D481G02RR, 140D481G03 or
G04, along with the
Test Kit Adapter
8779C02G04, can be
used to test the trip unit and circuit breaker.
CAUTION
PERFORMING TESTS WITHOUT THE CUTLER-
HAMMER- APPROVED TEST KIT MAY DAMAGE THE
DIGITRIP UNIT.
5.0 TEST PROCEDURES
5.1 Test Precautions
WARNING
DO NOT ATTEMPT TO INSTALL, TEST, OR PERFORM
MAINTENANCE ON EQUIPMENT WHILE IT IS ENER-
GIZED. DEATH OR SEVERE PERSONAL INJURY CAN
RESULT FROM CONTACT WITH ENERGIZED EQUIP-
MENT.
DE-ENERGIZE THE CIRCUIT AND DISCONNECT THE
CIRCUIT BREAKER BEFORE PERFORMING MAINTE-
NANCE OR TESTS.
