GE 869 - Page 231

CHAPTER 4: SETPOINTS OUTPUTS
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 4–99
can be reset with a reset command. If the Self-reset type is selected, the output relay is
energized when the corresponding element operates and it stays energized until the
element drops out.
CRITICAL FAILURE RELAY
The 8 Series relay is equipped with one output relay (# 8 - “Critical Failure Relay”) for
failsafe indication. The Critical Failure Relay is a Form-C contact with one NO and one NC
contact (no control power). There are no user-programmable setpoints associated with this
output relay.
52a Contact Configured 52b Contact Configured Relay Operation
Yes Yes Trip Relay and Close Relays continue
operating until the switching device is
detected opened or closed using both
52a and 52b contacts as per switching
device detection logic.
Yes No The Trip Relay continues operating until
52a indicates an open switching device.
The Close Relay continues operating
until 52a indicates a closed switching
device.
No Yes The Trip Relay continues operating until
52b indicates an open switching device.
The Close Relay continues operating
until 52b indicates a closed switching
device.
No No The Trip Relay operates upon a Trip
command and stays “high” until the
100 ms default time expires. The Close
Relay operates upon a close command
and resets after the 200 ms time
expires.