TESTING OF INSTANTANEOUS PICK-UP:
1.
Connect the test set to a suitable source
of
power. Be sure that the ON/OFF Switch
on
the test set is OFF.
2.
Make sure the line side circuit
of
the breaker to be tested is de-energized or
disconnected.
Close the breaker to
be
tested.
3.
Connect the output
of
the test set to one pole
of
the breaker to be tested (see
SELECTION OF OUTPUT CONNECTION, Section IV, 2, B).
4.
Connect a set
of
light leads from the binding post marked TIMER STOP to another
pole
of
the breaker being tested. .
NOTE:
Not applicable when testing single-pole breakers using the C.A. TIMER
STOP MODE.
5.
Turn test set circuit breaker ON. The front panel display should illuminate.
NOTE: To set up controls, see "SETUP OF CONTROLS" before testing
in
the
previous section.
6.
Select the proper ammeter range so that the instantaneous pick-up current
of
the
instantaneous element can be read as near to full scale as possible.
7.
Place the ammeter mode switch
in
the MEMORY. (See Section
111,2,
E to program
pulse duration.)
8.
Rotate VERNIER CONTROL while alternately pressing the START button until the
circuit breaker under test trips instantaneously. Read ammeter for value
of
current
required to trip breaker.
If
breaker does not trip instantaneously with VERNIER CONTROL fully rotated, turn
OUTPUT SELECTOR Switch to next higher position and repeat procedure (refer to
procedure
NOTE under TESTING OF TIME DELAY
in
the previous section).
If
at the last position the required test current still is not reached, connect the test
set's output in series.
(See SELECTION OF OUTPUT CONNECTION, Section IV,
2,
B). Switch the AMMETER MODE selection from PARALLEL to SERIES position
and repeat the procedure.
25
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