5-2
BE1-46N Testing
NOTE
Time delay for the ALARM trip circuit is factory set at 3.0 seconds ±5%. Three seconds
after the ALARM LED lights, the ALARM output contacts actuate.
NOTE
Three seconds after the closing of switch A the ALARM input contacts actuate. (Time
delay is factory set at 3 seconds.)
1.
The inconsistent method of testing. (Example: The start pulse to the timer does not always begin
on the zero crossing.)
2.
The inherent error of the test equipment used. Test equipment should be accurate to within 1.0%
or better.
3.
The tolerance level of components used in the test setup. Components should be specified to within
1.0% or better.
Step 1. Set the TAP ADJUST to the A position and turn the CAL control fully CW (5 A CT = 3.2 A) (1 A CT
= 0.64 A).
Step 2. Set the PICKUP and ALARM thumbwheel switches to 33 (33%).
Step 3. Connect a current source to the phase A input terminals.
Step 4. Slowly increase the magnitude of the phase A current until the ALARM and PICKUP LEDs just light.
Do not increase the current any further.
Step 5. Measure and record the applied current and observe the remote meter.
RESULT:
The recorded pickup value should be 3.168 A ±0.048 A for 5 A CTs and 0.634 A ±0.048 A
for 1 A CTs, and the meter should correspond to 33%.
Step 6. Slowly decrease the input current until the PICKUP and ALARM LED's go out.
Step 7. Measure and record the applied current and observe the remote meter.
RESULT:
The recorded value for dropout should be no less than 98% of the pickup level or 0.064 A
(for a 5 A CT) or 0.12 (for a 1 A CT) less than that recorded for PICKUP and the meter
should correspond.
Timing
The results obtained from these procedures are sufficient to determine the relay timing characteristics.
Step 1. Connect the test circuit as shown in the test setup diagram, Figure 5-1, set TAP ADJUST to A
position, and the CAL control fully CW.
Step 2 Adjust current source to apply 4.8 A for the 5 A CT or .96 A for the 1 A CT (50% I
2
or 0.5 pu) to the
phase A input and set the front panel controls as follows:
&
PICKUP and ALARM to 05
&
K SET to 10
&
MAX TIME to 10
Step 3. Close switch A to apply current to relay and initiate timer.
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