Waveform Capture; Ground Switch Status - GE Multilin 489 Instruction Manual

CHAPTER 5: SETPOINTS

5.4.11 Waveform Capture

WAVEFORM

5.4.12 Ground Switch Status

GROUND
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
Courtesy of NationalSwitchgear.com
TACHOMETER TRIP
MESSAGE
SPEED: 110% Rated
TACHOMETER TRIP
MESSAGE
DELAY: 1 s
One of assignable digital inputs 4 to 7 may be assigned to the tachometer function to
measure mechanical speed. The time between each input closure is measured and
converted to an RPM value based on one closure per revolution. If an overspeed trip or
alarm is enabled, and the measured RPM exceeds the threshold setpoint for the time
specified by the delay, a trip or alarm will occur. The RPM value can be viewed with the
METERING DATA SPEED
For example, an inductive proximity probe or hall effect gear tooth sensor may be used to
sense the key on the generator. The probe could be powered from the +24V from the digital
input power supply. The NPN transistor output could be taken to one of the assignable
digital inputs assigned to the tachometer function.
PATH: SETPOINTS S3 DIGITAL INPUTS
ASSIGN DIGITAL
[ ] INPUT: None
If an input is assigned to the tachometer function, it may not be used here.
This feature may be used to trigger the waveform capture from an external contact. When
one of the inputs is assigned to the Waveform Capture function, shorting that input will
trigger the waveform.
PATH: SETPOINTS S3 DIGITAL INPUTS
ASSIGN DIGITAL
[ ] INPUT: None
GROUND SWITCH
MESSAGE
CONTACT: Auxiliary a
If an input is assigned to the tachometer function, it may not be used here.
This function is used to detect the status of a grounding switch for the generator for which
the relay is installed. Refer to Stator Ground Fault on page A–1 for additional details.
Range: 101 to 175% in steps of 1
Range: 1 to 250 s in steps of 1
actual value.
TACHOMETER
WAVEFORM CAPTURE
Range: None, Input 1 to Input 7.
GND SWITCH STATUS
Range: None, Input 1 to Input 7
Range: Auxiliary a, Auxiliary b
A2
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