5–20 489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 5: SETPOINTS
standard ABC, the system phase sequence setpoint may be used to accommodate this
rotation. This setpoint allows the 489 to properly calculate phase reversal and negative
sequence quantities.
5.3.4 Serial Start/Stop Initiation
PATH: SETPOINTS ZV S2 SYSTEM SETUP ZV SERIAL START/STOP
If enabled, this feature will allow the user to initiate a generator startup or shutdown via
the RS232/RS485 communication ports. Refer to GE publication number GEK-106495: 489
Communications Guide for command formats. When a startup command is issued, the
auxiliary relay(s) assigned for starting control will be activated for 1 second to initiate
startup. When a stop command is issued, the assigned relay(s) will be activated for 1
second to initiate a shutdown.
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SERIAL [Z]
SERIAL START/STOP
INITIATION: Off
Range: On, Off
MESSAGE
STARTUP INITIATION
RELAYS (2-5): ----
Range: Any Combination of Relays 2 to
5
MESSAGE
SHUTDOWN INITIATION
RELAYS (1-4): ----
Range: Any Combination of Relays 1 to
4
MESSAGE
SERIAL START/STOP
EVENTS: Off
Range: On, Off
Courtesy of NationalSwitchgear.com
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