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350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
S5 INPUTS/OUTPUTS
CHAPTER 6: SETPOINTS
Critical Failure Relay
#7
The 350 relay is also equipped with one output relay (# 7 - “Critical Failure Relay”) for fail-
safe indication. There are no user-programmable setpoints associated with this output
relay. The logic for this relay is shown below.
The Critical Failure Relay (Output Relay 7) is a form C contact (refer to the Typical Wiring
Diagram) with one NO and one NC contacts (no control power). Output relay 7 is energized
or de-energized (state change) depending on the following conditions:
1.
Output Relay 7 will be
de-energized
, if the relay is not IN-SERVICE or the control power
is not applied to the relay
2.
Output Relay 7 will be
energized
when the control power is applied to the relay and
the relay is IN-SERVICE mode.
3.
Output Relay 7 will stay
de-energized
, when the control power is applied, if the relay
was not programmed as “Ready”, or upon major self-test failure during relay boot up.
4.
Output Relay 7 will change state from
energized
to
de-energized
if the 350 relay
experiences any major self-test failure.