7.11 Power Failure / Non-Volatile Memory - GE 239 Instruction Manual

CHAPTER 7: TESTING

7.11 Power Failure / Non-volatile Memory

239 MOTOR PROTECTION RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
1. Slowly decrease the AC voltage applied to a 239 relay until the UNDERVOLTAGE
message appears on the 239 display. At this instant all output relays will go to their
de-energized state and the SERVICE LED turns on. This phenomenon should occur
after the voltage has decreased below 70 V.
2. To test the memory circuitry of the relay, remove and then re-apply control power. All
stored setpoints and statistical data should be unchanged. The displayed thermal
capacity in
A2: METERING\MOTOR CAPACITY
control power is removed. An accurate value of thermal capacity is guaranteed if the
power off time is less than 60 minutes.
will continue to decrease even when
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