ETI PI-800 Instruction Manual page 36

Electrical Test Instruments PI-800 and PI-1600
Section IV - Operating Instructions
==============================================================================
correct value by using vernier control, or press MAINTAIN key for current
hold.
15. When breaker trips, the test set output should de-energize, timer should
stop, and OUTPUT ON light should turn off.
16. Read and record trip current and trip time. Compare to manufacturer's
time/current curve.
17. If test is to be repeated, make sure that breaker cools completely.
18. Shut down test set, disconnect breaker, and prepare for subsequent test-
ing or relocation according to steps 19 through 23 in pre-test installation
and setup outlined above.
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 17 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
==============================================================================
Copyright(C) 1994-2003 Electrical Test Instruments, Inc.
Page IV-6
All Rights Reserved