GE Multilin 350 Series Instruction Manual page 185

CHAPTER 7: MAINTENANCE
Close - form A contacts
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
Figure 7-5: Close Coil circuit with continuous monitoring
DC +
B4
A4
V
B5
52b contact
Close
Coil
DC -
The following path is available using the keypad. For instructions on how to use the
keypad, please refer to Section 3.1.2.1 - Working with the Keypad.
PATH:
MAINTENANCE > M3 BKR MAINTENANCE
CLOSE COIL FUNCTION
Range: Disabled, Alarm, Latched Alarm
Default: Disabled
Selecting Alarm, or Latched Alarm, enables the Close Coil Monitor monitoring function.
The "ALARM" and "MAINTENANCE" LEDs will light up upon detection of a close coil
circuitry problem. The "ALARM" LED will flash upon a Close Coil Monitor operating
condition, with the Close Coil Monitor function selected as Alarm, and will self-reset,
when the condition clears. If Latched Alarm is selected, the "ALARM" LED will flash during
the Close Coil Monitor condition, and will stay "ON" after the condition clears, until the
reset command is initiated. Any or all of output relays 3 to 6 can be selected to operate
when the Close Coil Monitor function is selected as Alarm, or Latched Alarm.
CLOSE COIL DELAY
Range: 1 to 10 sec in steps of 1 sec
Default: 5 s
This setting defines the Close Coil Monitor Delay, before targets appear on the display,
"ALARM" and "MAINTENANCE" LEDs light up on the front panel, and selected output
relays operate.
BYPASS BKR STATUS
Range: Disabled, Enabled
Default: Disabled
Set the "BYPASS BKR STATE" to Enabled when a by-pass resistor is connected across the
breaker auxiliary contact for continuous Close circuit integrity monitoring. The circuits
will be monitored regardless of breaker position. When "BYPASS BKR STATE" is set to
Disabled, monitoring of the close coil will be blocked when the breaker is closed.
OUTPUT RELAY 3 to 6
Range: Do not operate, Operate
Default: Do not operate
Any, or all, of output relays 3 to 6 can be selected to operate upon detection of a Close
coil circuitry problem. The selection of the relay outputs operation is available no matter
whether the Alarm, or Latched Alarm, function is selected.
External
jumper
By-pass
R
resistor
M3 BREAKER MAINTENANCE
898793.cdr
7–7