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GEK-90636
Visual
Remove the relay from its case and check for signs of physical damage such as
broken or cracked parts.
CAUTION:
Every circuit
in
the drawout case has an auxiliary brush. it is especially
important on circuits with shorting bars that the auxiliary brush be bent
high enough to engage the connecting plug or test plug before the main
brushes do. This will prevent the secondary circuits
from
being open-
circuited during insertion of the connection plug.
A drawout case relay may be tested without removing it, from the panel, by using
a 12XLAI3A test plug. This plug makes connection to the relay only and does not
disturb any shorting bars in the case. The 12XLA12A test plug may also be used.
Although this plug allows greater flexibility, it requires shorting jumpers since
connections are made to both the relay and the external circuits.
'Pest Equipment
1
DC voltage source rated at 48V to 250V with less than 5% ripple
2. Variable frequency generator or line frequency rated at 48 to l2OVrms, 40 to
70 hertz
3. Limiting resistor, or load box for trip target indicator test. Rated from 100Q-
3KQ, 25 Watts.
General Testing Considerations
The relay can be tested with a variable voltage/frequency generator or with the
line frequency. The acceptance test have taken into account both contingencies.
Each test has a section for line frequency testing and or for variable frequency
generators.
When utilizing variable frequency/voltage generators refer to the test equipment
manufactures manual for specific operation instructions of the test apparatus.
Testing with line frequency requires that the frequency setpoints of the relay be
set above or below the line frequency depending on the fault being simulated.
Relay Outputs
Test Targets
The test target LEDs are labled Test Fl,TB to F4,TB, see figure 17, 19 (front
panels). The test targets indicatEWe status of the output relay (TB) and the
frequency measuring element (F-). The "F" test indicator will light when the
frequency deviates from the setpoint for 3 consecutive cycles. The "TB" indicator
lights when the timer is producing an output to operate the output relay.
Trip Targets
The trip target LEDs are labeled
F1,RC to F4,RC. They will latch "on" when
the relay trips and there is over lOOma through the normally open contacts. They
are reset with the target reset switch or by the removal of the relay power.
11
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