Waveform Capture; Ground Switch Status - GE 489 Instruction Manual

4 SETPOINTS
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 over-
speed 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
value.
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

WAVEFORM CAPTURE

[ENTER] for more
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
GND SWITCH STATUS
[ENTER] for more
This function is used to detect the status of a grounding switch for the generator for which the relay is installed. Refer to
Appendix B for Application Notes.
GE Multilin
WAVEFORM CAPTURE
ð
ASSIGN DIGITAL
ENTER
ð
INPUT: None
ESCAPE
GND SWITCH STATUS
ð
ASSIGN DIGITAL
ENTER
ð
ESCAPE INPUT: None
GROUND SWITCH
ESCAPE
CONTACT: Auxiliary a
MESSAGE
489 Generator Management Relay
4.4 S3 DIGITAL INPUTS
A2 METERING DATA SPEED
4.4.11 WAVEFORM CAPTURE
Range: None, Input 1 to Input 7. If an input is assigned to
the Tachometer, it may not be used here.

4.4.12 GROUND SWITCH STATUS

Range: None, Input 1 to Input 7. If an input is assigned to
the Tachometer, it may not be used here.
Range: Auxiliary a, Auxiliary b
actual
TACHOMETER
4
4-19