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CHAPTER 6: SETPOINTS
Auxiliary Output
Relays 3 to 6
RESET (Relay Keypad)
RESET (Communications)
RESET (Input)
Breaker Control
SETPOINT
RELAY (3- 6 ) AUXILIARY
OUTPUT TYPE
Latched
Self-Reset
Relay
Ready = 1
(
)
Assigned aux. outputs:
From Protection Feature
From Control Feature
From Maintenance Feature
Critical Failure Relay
#7
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
The 350 relay is equipped with four auxiliary output relays numbered from 3 to 6. All these
relays are available for selection for operation of protection, control, or maintenance
features. Each auxiliary relay can be selected as either Self-Reset, or Latched. If the Self-
Reset type is selected, the output relay will be energized as long as the element is in
operating mode and will reset when the element drops out. If the Latched type is selected,
the output relay will stay energized, after the element dropout, and will be de-energized
upon the reset command.
PATH:
SETPOINTS > S5 INPUTS/OUTPUTS > OUTPUT RELAYS > RELAY 3(6) AUXILIARY
OUTPUT TYPE
Range: Self Reset, Latched
Default: Self Reset
Figure 6-70: Auxiliary relays
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:
S5 INPUTS/OUTPUTS
Operate Aux
-
Output Relay ( 3
6 )
Message &
Event Recorder
897777.cdr
6–163
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