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-13
precautions and the expected timing test results. The test current should
be 3 to 4 times the rating of the relay operating coil or heater.
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.
Connect the relay operating coil or heater circuit terminals to the breaker
test set common terminal and the proper output tap terminal.
10.
Connect the relay control circuit contacts to the CONTACTS terminals and
determine that they are closed by observing the CONTINUITY lamp.
11.
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.
12.
Press RESET button.
13.
Set MAC-21 to N.C. mode. Set MAINTAIN on.
14.
Press and release INITIATE button; OUTPUT ON light should glow, timer
should operate, and current should indicate on display.
15.
When the relay control circuit contacts open, the test set output should
deenergize and the timer should stop.
16.
Read and record the test value of current and the time of the test.
Compare the results to the manufacturer's specifications. If possible, adjust
the relay. Usually, if the relay time of operation is incorrect, it is necessary to
replace the relay heater with one of the recommended sizes for the motor
being protected. If a check test is desired, the relay must be allowed to cool
for a period of time (approximately 15 to 30 minutes).
17.
For a multi-pole relay, repeat the above tests for the other relay poles.
18.
Shut down test set, disconnect breaker, and prepare for subsequent
