Electrical Test Instruments PI-6000
Section IV - Operating Instructions
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Copyright(C) 1994-2019 Electrical Test Instruments, LLC All Rights Reserved
Page IV-5
Instantaneous Trip Time Test
1.
Perform Instantaneous Pickup Test as outlined above.
2.
Adjust controls to obtain current above pickup, at approximate desired
multiple of rating.
3.
Close breaker under test.
4.
Press the INITIATE button. Breaker should trip instantaneously.
5.
Read and record timer and ammeter readings as instantaneous trip time
and current.
6.
Shut down test set, disconnect breaker, and prepare for subsequent
testing or relocation according to steps 18 through 22 in pre-test
installation and setup outlined above.
MULTI-POLE MOLDED CASE CIRCUIT BREAKERS
Timing Test
1.
Consult breaker manufacturer's literature to determine any necessary
precautions and expected test results. A test current of three times the
rating of the breaker should be used for this test.
2.
Follow steps 1 through 16 in pre-test installation and setup, as required, to
set up the breaker test set.
3.
Connect appropriate output tap to one pole of breaker under test.
4.
Setup MAC-21 for C.L. Maint (MAINTAIN on).
5.
Set MAC-21 RANGE to lowest range that is greater than desired test
current.
6.
Set TIMEBASE to CYCLES.
7.
Press PRESET key. Adjust preset time to 5.0 cycles. This value may be set
higher or lower, depending on trip characteristics of breaker.
8.
Press PRESET again to return to normal mode.
9.
Select MEMORY mode.
10.
Repeatedly jog the INITIATE button, while adjusting the OUTPUT
CONTROL higher, until the desired test current is read on the ammeter. If
insufficient current is obtained at maximum position of the rheostat, set
the OUTPUT TAP control to the next higher tap, return the rheostat to zero,
and continue.
