Cutler-Hammer Digitrip RMS 510, Инструкция по эксплуатации

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5*
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Fig.
4. 7
Ground Fault Time Delay Settings
Note: See also Section 3.6 on Zone Interlocking.
5.0 TEST PROCEDURES
5.1 General
A
DANG ER
D O 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 B REAKER BEFORE PERFORMING MAINTE­
NANCE OR TESTS.
As illustrated in Figs. 1 and 5, an integral test panel is
provided to test the Digitrip RMS 51 0 Trip Unit.
Several no-trip settings are provided to check the trip unit
operation without actually tripping the circuit breaker.
I.L. 29-8858
Available "Test Amps" Settings
Breaker Trips
At
6T
and G FT
Test Amps
�:!)
x In
L
Test ®
0
Trip
@ 0
Reset
Unit
0
Status
CD
"
6
T
"
= Phase Current Test at
6xln
and TRIPS breaker;
"1 ,
2, 3,
8 o r
1 0" x I
= Phase
Current Test - NO
'b
reaker
TRIP;
"GFT" = Ground Current Test
and TRIPS breaker;
"GF" = G round Current Test -
NO breaker
TRIP.
See Section 5.4.3 for inser­
vice test trip limitations.
@ Push, then release Trip Reset
button to reset Trip Unit.
Required following all
automatic trip and test
operations.
@ Push, then release Test
button to test. Test operation
begins with release of
pushbutton.
Fig. 5 Integral Test Panel (Lower Right Corner of Trip
Unit)
A
CAUTION
TESTING A CIRCUIT BREAKER UNDER "TRIP CON­
DITIONS" WHILE IT IS IN SERVICE AND CARRYING
LOAD CURRENT, WHETHER DONE BY INTERNAL
OR EXTERNAL M EANS, IS NOT RECOMMENDED.
ANY TRIPPING OPERATION WILL CAUSE DISRUP­
TION OF SERVICE AND POSSIBLE PERSONAL
INJURY RESULTING FROM UNNECESSARY SWITCH­
ING OF CONNECTED EQUIPMENT.
TESTING OF A CIRCUIT BREAKER THAT RESULTS
IN THE TRIPPING O F THE CIRCUIT BREAKER
SHOULD BE DONE O N LY WITH THE CIRCUIT
B REAKER IN THE "TEST" OR "DISCONNECTED"
CELL POSITIONS OR WHILE THE CIRCUIT
BREAKER IS ON A TEST BENCH.
To preserve the primary protection function of the trip
unit, all in-service testing u nder ''Trip" or "No-Trip" condi­
tions are only performed at load current values no greater
than 50% of the Long Delay Current Setting,
1,.
Any
attempt to conduct in-service testing when the load cur­
rent exceeds 50% of
1,,
will not be executed by the trip
unit.
Since the Digitrip RMS 51 0 Trip Unit is completely self­
powered using energy derived from the current sensors
installed in the circuit breaker, all in-service tests con­
ducted should be conducted with the auxiliary control
power module, shown in Fig. 7, plugged into the trip unit.
This action will avoid difficulties caused by load current
levels that are too low to operate the trip unit.
Effective May 1 997
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