Open Rtd Sensor - GE Multilin 489 Instruction Manual

5.9.6

Open RTD Sensor

1 OPEN RTD
SENSOR
5–68
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RTD #12 ALARM
MESSAGE
TEMPERATURE: 60°C
RTD #12 ALARM
MESSAGE
EVENTS: Off
RTD #12 TRIP:
MESSAGE
Off
RTD #12 TRIP VOTING:
MESSAGE
RTD #12
ASSIGN TRIP
MESSAGE
RELAYS (1-4): 1---
RTD #12 TRIP
MESSAGE
TEMPERATURE: 80°C
RTDs 12 defaults to Ambient RTD type. The Ambient selection allows the RTD to be used to
monitor ambient temperature. There are individual alarm and trip configurations for this
RTD. Trip voting has been added for extra reliability in the event of RTD malfunction. If
enabled, a second RTD must also exceed the trip temperature of the RTD being checked
before a trip will be issued. If the RTD is chosen to vote with itself, the voting feature is
disabled. The RTD name may be changed if desired.
SETPOINTS S8 RTD TEMPERATURE
[ ] OPEN RTD SENSOR:
Off
ASSIGN ALARM
MESSAGE
RELAYS (2-5): ---5
OPEN RTD SENSOR
MESSAGE
ALARM EVENTS: Off
The 489 has an Open RTD Sensor Alarm. This alarm will look at all RTDs that have either an
alarm or trip programmed and determine if an RTD connection has been broken. Any RTDs
that do not have a trip or alarm associated with them will be ignored for this feature. When
a broken sensor is detected, the assigned output relay will operate and a message will
appear on the display identifying the RTD that is broken. It is recommended that if this
feature is used, the alarm be programmed as latched so that intermittent RTDs are
detected and corrective action may be taken.
CHAPTER 5: SETPOINTS
Range: 1 to 250°C in steps of 1
Range: On, Off
Range: Off, Latched, Unlatched
Range: RTD #1 to RTD #12
Range: Any combination of Relays 1 to
4
Range: 1 to 250°C in steps of 1
OPEN RTD SENSOR
Range: Off, Latched, Unlatched
Range: Any combination of Relays 2 to
5
Range: On, Off
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL