ETI PI-800 Instruction Manual page 39

Electrical Test Instruments PI-800 and PI-1600
Section IV - Operating Instructions
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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 19 through 23 in pre-test installation
and setup outlined above.
Instantaneous Trip Time Test
1. Perform Instantaneous Pickup Test as outlined above.
2. Adjust controls to obtain current above pickup, at approximate desired
multiple of rating.
3. Close breaker under test.
4. Press the INITIATE button. Breaker should trip instantaneously.
5. Read and record timer and ammeter readings as instantaneous trip time
and current.
6. Repeat the above test for the other poles of the circuit breaker.
7. 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.
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