Field-Breaker; Tachometer - GE Multilin 489 Instruction Manual

5.4.9

Field-Breaker

FIELD-
BREAKER [ ]

5.4.10 Tachometer

TACHOMETER
5–26
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PATH: SETPOINTS S3 DIGITAL INPUTS
ASSIGN DIGITAL
INPUT: None
FIELD STATUS
MESSAGE
CONTACT: Auxiliary a
ASSIGN TRIP
MESSAGE
RELAYS (1-4): 1---
FIELD-BKR DISCREP.
MESSAGE
TRIP DELAY: 1.0 s
If an input is assigned to the tachometer function, it may not be used here.
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 nuisance 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.
PATH: SETPOINTS S3 DIGITAL INPUTS
ASSIGN DIGITAL
[ ] INPUT: None
RATED SPEED:
MESSAGE
3600 RPM
TACHOMETER
MESSAGE
ALARM: Off
ASSIGN ALARM
MESSAGE
RELAYS (2-5): ---5
TACHOMETER ALARM
MESSAGE
SPEED: 110% Rated
TACHOMETER ALARM
MESSAGE
DELAY: 1 s
TACHOMETER ALARM
MESSAGE
EVENTS: Off
TACHOMETER
MESSAGE
TRIP: Off
ASSIGN TRIP
MESSAGE
RELAYS (1-4): 1---
CHAPTER 5: SETPOINTS
FIELD-BREAKER DISCREPANCY
Range: None, Input 1 to Input 7
Range: Auxiliary a, Auxiliary b
Range: Any combination of Relays 1 to
4
Range: 0.1 to 500.0 s in steps of 0.1
TACHOMETER
Range: None, Inputs 4 to 7.
Range: 100 to 3600 RPM in steps of 1
Range: Off, Latched, Unlatched
Range: Any combination of Relays 2 to
5
Range: 101 to 175% in steps of 1
Range: 1 to 250 s in steps of 1
Range: On, Off
Range: Off, Latched, Unlatched
Range: Any combination of Relays 1 to
4
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL