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Testing Static Trip III Devices
NOTE
Keep 12t out, ZSI out, and thermal memory off
Trip devices can be tested when mounted on a circuit
breaker in the disconnect position in its cubicle, with the
device on a circuit breaker removed from its cubicle or with
the device separate from the circuit breaker.
The following instructions cover testing of all the elements for
the most complicated type of trip device. Other types do not
contain all these elements. See the listing and description of
available types in Table 1.
The selector switch must be in the "STATIC TRIP TEST"
position for all static trip device tests. The ammeter range
switch should be in the "LOW" position for all tests below 1.5
amperes, and in the "HIGH" position for all tests above 1.5
amperes. Current must be re-adjusted when changing ranges
since the switch also inserts an additional current limiting
reactor when in the "LOW" range position.
Testing Static Trip Device on Circuit
Breaker
CAUTION
The static trip circuit is capacitively coupled to the circuit
breaker frame. Therefore, to insure against electrical shock
be sure to ground the frame when testing with the circuit
breaker out of the cubicle.
NOTE
The test set isolates the power source from its output leads
by an open relay contact in each line except when a test is
being run. In the case of excessive ground current, the test
set will trip out and light the ALARM light.
6
Connections
Use Cord Set 18-732-184-508
Figure 4 shows how to connect the test set leads to the trip
device. The cord set connector makes all of the connections
required. The phase selector switch is used to select the
appropriate terminals.
Long Time Pick-Up Test
1.
Use phase selector switch to select phase 1, 2 or 3,
desired
2.
Set "LONG TIME PICK-UP" on 0.5. Place the selector
switch to "STATIC TRIP TEST" position. Set the RANGE
switch on "LOW." Set the POWER selector switch to
"INTERNAL". Set ammeter to RMS responding, STATIC
TRIP III Long Time.
3.
Turn the power switch to "ON." The red digits of the
meters should come ON. (The alarm light may also come
ON. If so, press the "STOP" alarm reset button.) Press
the "START" push button to initiate current.
4.
Slowly increase the current by rotating the "INTERNAL
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