CHAPTER 7: MAINTENANCE M3 BREAKER MAINTENANCE
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 7–9
Figure 7: Close coil monitoring logic diagram
Breaker trip counter
When the total number of breaker trips detected reaches the TRIP COUNTER LIMIT
setpoint, an output will occur.
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Chapter 3 - Working with the Keypad.
PATH:
MAINTENANCE > M3 BKR MAINTENANCE > BKR TRIP COUNTER
SETPOINT
CLOSE COIL FUNCTN:
Disabled = 0
Latched Alarm
Event Recorder
Transient Recorder
Alarm
OR
OR
AND
SETPOINT:
Operate
output relays
upon
selection
OUTPUT RELAY 4
OUTPUT RELAY 5
OUTPUT RELAY 6
OUTPUT RELAY 3
Close Coil Montr OP
Message
Close Coil current above
threshold
AND
OR
52a/b INPUTS
Breaker Open
Close
From output relay 2 CLOSE
SETPOINT
BYPASS BKR STATE
Enabled = 1
Disable = 0
AND
CLOSE COIL DELAY:
SETPOINT
t
PKP
LED:
MAINTENANCE
Close Coil Montr PKP
Message
LED: ALARM
RESET
Command
AND
S
R
LATCH
898021.cdr
Courtesy of NationalSwitchgear.com
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