Testing Static Trip II
TM
Devices
1 7
3.
Press the START button and adjust the current to 0.5
ampere or more. (Erroneous time delay readings and
failure to trip the circuit breaker or target may occur at
lower values of current. The waveshape of current from
the test set may not provide enough power to charge the
filter capacitor in the trip device before tripping occurs.
By running the test at a higher current this effect is
minimized). In turn press the STOP and the RESET
button.
4.
Close the circuit breaker, if desired.
5.
Press the START button. The breaker should trip in 0.4
and 0.5 seconds. See Figure 7. If the device has a target,
its red button should pop out.
6.
Repeat for other GROUND TIME BAND SETTINGS and
for other pick-up and current settings, if desired. Make
current adjustments above 1 ampere quickly to avoid
overheating .
Bench Testing Static Trip II Devices
Connections
With the static trip device away from the circuit breaker it is
necessary to make connections directly to the fanning strip
of the trip device. A terminal block is provided on the test set
to facilitate this connection. Simply connect the fanning strip
to the terminal block and tighten all screws. The end of the
fanning strip next to the cord must connect to terminal 1, a
spacer under one mounting screw of the test set faceplate
provides interference if the connections are made incorrectly.
The terminal block is connected internally, so the cord set is
not used.
Test Procedure
The testing procedures are exactly the same as given in
“TESTING THE STATIC TRIP ON THE CIRCUIT BREAKER”
except, of course, any reference to the circuit breaker is
ignored, and the phase selector switch is used to change the
test connectors .
