GE Multilin 489 User Manual

CHAPTER 5: SETPOINTS
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–23
Inputs may be configured for control, alarm, or trip. If the control feature is enabled, the
assigned output relay(s) operate when the input is asserted. If the
PULSED CONTROL RELAY
DWELL TIME
is set to “0”, the output relay(s) operate only while the input is asserted.
However, if a dwell time is assigned, the output relay(s) operate as soon as the input is
asserted for a period of time specified by the setpoint. If an alarm or trip is enabled and the
input is asserted, an alarm or trip will occur after the specified delay.
5.4.4 Remote Reset
PATH: SETPOINTS ZV S3 DIGITAL INPUTS ZV REMOTE RESET
Once an input is assigned to the Remote Reset function, shorting that input will reset any
latched trips or alarms that may be active, provided that any thermal lockout time has
expired and the condition that caused the alarm or trip is no longer present.
If an input is assigned to the tachometer function, it may not be used here.
5.4.5 Test Input
PATH: SETPOINTS ZV S3 DIGITAL INPUTS ZV TEST INPUT
Once the 489 is in service, it may be tested from time to time as part of a regular
maintenance schedule. The unit will have accumulated statistical information relating
historically to generator and breaker operation. This information includes: last trip data,
peak demand data, MWh and Mvarh metering, parameter averages, RTD maximums,
analog input minimums and maximums, number of trips, number of trips by type, number
of breaker operations, the number of thermal resets, total generator running hours, and
the event record. When the unit is under test and one of the inputs is assigned to the Test
Input function, shorting that input will prevent all of this data from being corrupted or
updated.
If an input is assigned to the tachometer function, it may not be used here.
5.4.6 Thermal Reset
PATH: SETPOINTS ZV S3 DIGITAL INPUTS ZV THERMAL RESET
During testing or in an emergency, it may be desirable to reset the thermal memory used
to zero. If an input is assigned to the Thermal Reset function, shorting that input will reset
the thermal memory used to zero. All Thermal Resets will be recorded as events.
If an input is assigned to the tachometer function, it may not be used here.
 REMOTE RESET [Z] ASSIGN DIGITAL
INPUT: None
Range: None, Input 1, Input 2, Input 3,
Input 4, Input 5, Input 6, Input 7
 TEST INPUT [Z] ASSIGN DIGITAL
INPUT: None
Range: None, Input 1, Input 2, Input 3,
Input 4, Input 5, Input 6, Input 7
 THERMAL RESET [Z] ASSIGN DIGITAL
INPUT: None
Range: None, Input 1, Input 2, Input 3,
Input 4, Input 5, Input 6, Input 7
Courtesy of NationalSwitchgear.com

GE Multilin 489 Specifications

General

Brand	GE
Model	Multilin 489
Category	Relays
Language	English