GE 489 - Manual (Page 68)

4-18 489 Generator Management Relay GE Multilin
4.4 S3 DIGITAL INPUTS 4 SETPOINTS
4
4.4.9 FIELD-BREAKER DISCREPANCY
PATH: SETPOINTS ÖØ S3 DIGITAL INPUTS ÖØ FIELD-BKR DISCREP.
The field-breaker discrepancy function is intended for use with synchronous generators. If a digital input is assigned to this
function, any time the field status contact indicates the field is not applied and the breaker status input indicates that the
generator is online, a trip will occur once the time delay has expired. The time delay should be used to prevent possible nui-
sance tripping during shutdown. The field status contact may be chosen as "Auxiliary a", open signifying the field breaker or
contactor is open and shorted signifying the field breaker or contactor is closed. Conversely, the field status contact may be
chosen as "Auxiliary b", shorted signifying the field breaker or contactor is open and open signifying it is closed.
4.4.10 TACHOMETER
PATH: SETPOINTS ÖØ S3 DIGITAL INPUTS ÖØ TACHOMETER
„ FIELD-BKR DISCREP.
„ [ENTER] for more
ASSIGN DIGITAL
INPUT: None
Range: None, Input 1 to Input 7. If an input is assigned to
the Tachometer, it may not be used here.
FIELD STATUS
CONTACT: Auxiliary a
Range: Auxiliary a, Auxiliary b
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
FIELD-BKR DISCREP.
TRIP DELAY: 1.0 s
Range: 0.1 to 500.0 s in steps of 0.1
„ TACHOMETER
„ [ENTER] for more
ASSIGN DIGITAL
INPUT: None
Range: None, Inputs 4 to 7. Only Digital Inputs 4 to 7
may be assigned to the Tachometer
RATED SPEED:
3600 RPM
Range: 100 to 3600 RPM in steps of 1
TACHOMETER
ALARM: Off
Range: Off, Latched, Unlatched
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to 5
TACHOMETER ALARM
SPEED: 110% Rated
Range: 101 to 175% in steps of 1
TACHOMETER ALARM
DELAY: 1 s
Range: 1 to 250 s in steps of 1
TACHOMETER ALARM
EVENTS: Off
Range: On, Off
TACHOMETER
TRIP: Off
Range: Off, Latched, Unlatched
ASSIGN TRIP
RELAYS (1-4): 1---
Range: Any combination of Relays 1 to 4
TACHOMETER TRIP
SPEED: 110% Rated
Range: 101 to 175% in steps of 1
TACHOMETER TRIP
DELAY: 1 s
Range: 1 to 250 s in steps of 1
ENTER
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