Electrical Test Instruments PI-2500-G2 and PI-5000-G2
Section V - Service Information and Documentation
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Copyright(C) 1994-2021 Electrical Test Instruments, LLC. All Rights Reserved
Page IV-15
testing or relocation according to steps 18 through 22 in pre-test installa-
tion and setup outlined above.
Pick-Up of the Instantaneous Unit
1.
Consult breaker manufacturer's literature to determine any necessary pre-
cautions and expected test results. Note: If the instantaneous setting is
such that the expected test result is above that which may be easily pro-
duced by the test set, a valid test may be performed by adjusting the set-
ting to its minimum value. At the end of the test, restore the instantaneous
setting to its specified value.
2.
Follow steps 1 through 16 in pre-test installation and setup, as required, to
set up the breaker test set.
3.
Setup MAC-21 for C.L. Maint (MAINTAIN on).
4.
Set MAC-21 RANGE to lowest range that is greater than desired test cur-
rent.
5.
Set TIMEBASE to CYCLES.
6.
Press PRESET key. Adjust preset time to 5.0 cycles. This value may be set
higher or lower, depending on trip characteristics of breaker.
7.
Press PRESET again to return to normal mode.
8.
Select MEMORY mode.
9.
Repeatedly jog the INITIATE button, while adjusting the OUTPUT
CONTROL higher, until circuit breaker trips instantaneously. This is the ap-
proximate pickup point. If insufficient current is obtained at maximum po-
sition of the Vernier, set OUTPUT TAP control to next higher tap, return the
Vernier to zero, and continue.
10.
Close breaker under test.
11.
By repeating the test, determine the MINIMUM SETTING of the OUTPUT
CONTROL, at which the breaker under test opens immediately, whenever
the INITIATE button is depressed.
12.
Read and record ammeter reading as instantaneous pick-up of the
breaker.
13.
Repeat the above test for the other poles of the circuit breaker.
14.
If trip settings were modified for test purposes, restore them to their origi-
nal values.
15.
Shut down test set, disconnect breaker, and prepare for subsequent test-
ing or relocation according to steps 18 through 22 in pre-test installation
and setup outlined above.
