Electrical Test Instruments PI-2500 and PI5000
Section IV - Operating Instructions
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Page IV-10
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.
20.
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.
Pick-Up of Instantaneous Element
1.
Consult manufacturer's literature to determine any necessary precautions
and expected test results. Check the breaker's instantaneous setting.
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-20 for C.L. MOM.
4.
Set MAC-20 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.
Repeat the above test for the other poles of the circuit breaker.
14.
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.
