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-11
10.
Repeat the above tests for the other poles of the breaker, allowing time for
breaker to cool. Note: Results are acceptable if all poles of the breaker trip
within the manufacturer's time range for the value of test current chosen.
All poles of the breaker need not trip in exactly the same amount of time.
11.
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.
Pick-Up of the Instantaneous Unit
1.
Consult breaker manufacturer's literature to determine any necessary
precautions and expected test results. Note: If the instantaneous setting is
such that the expected test result is above that which may be easily
produced by the test set, a valid test may be performed by adjusting the
setting 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
current.
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
approximate pickup point. If insufficient current is obtained at maximum
position of the rheostat, set OUTPUT TAP control to next higher tap, return
the rheostat 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.
