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-7
Pick-Up of Instantaneous Element
1.
Consult breaker manufacturer's literature to determine any necessary pre-
cautions and expected test results. Check the breaker's instantaneous set-
ting. Pickup should occur at about that current.
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 the circuit breaker trips instantaneously. This is the
approximate pickup point. If insufficient current is obtained at maximum
position of the Vernier, set the OUTPUT TAP control to the 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.
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.
