CHAPTER 5: SETPOINTS
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL 5–69
5.9.7 RTD Short/Low Temp
PATH: SETPOINTS ZV S8 RTD TEMPERATURE ZV RTD SHORT/LOW TEMP
The 489 has an RTD Short/Low Temperature alarm. This alarm will look at all RTDs that
have either an alarm or trip programmed and determine if an RTD has either a short or a
very low temperature (less than –50°C). Any RTDs that do not have a trip or alarm
associated with them will be ignored for this feature. When a short/low temperature is
detected, the assigned output relay will operate and a message will appear on the display
identifying the RTD that caused the alarm. 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.
1 RTD [Z]
SHORT/LOW TEMP
RTD SHORT/LOW TEMP
ALARM: Off
Range: Off, Latched, Unlatched
MESSAGE
ASSIGN ALARM
RELAYS (2-5): ---5
Range: Any combination of Relays 2 to
5
MESSAGE
RTD SHORT/LOW TEMP
ALARM EVENTS: Off
Range: On, Off
Courtesy of NationalSwitchgear.com
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