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Large Dehumidifying Dryers Operation 54
5-3 Alarms
Use the Alarm History screen to monitor system alarms. From the Main Menu screen, press
the Alarms button to access the Alarm History screen. The three most recent alarms appear at
the top of the Alarm History screen. Use the DOWN and UP buttons to scroll through the
alarms.
(
Alarm History Screen)
5-4 Alarm Descriptions
Alarm
Comment
Alarm
Description
Alarm
Effect
VALVE
POSITION
The Main Air Valve did not maintain
position.
Possible Motor or Limit Switch Failure.
Immediate
Shut Down
VALVE
MTR
OVERRIDE
The Main Air Valve did not find
position.
Possible Motor or Limit Switch Failure.
Immediate
Shut Down
VALVE
MOTOR FAIL
The Main Air Valves expected and actual
positions do not match.
Possible Motor or Limit Switch Failure.
Immediate
Shut Down
PROCESS
SENSOR FAIL
The process supply air temperature
thermocouple is out of range.
Possible thermocouple failure.
Process
Shut Down
REGEN
SENSOR FAIL
The regeneration air temperature
thermocouple is out of range.
Possible thermocouple failure.
Regeneration
Shut Down
PROCESS
HIGH TEMP
Process air temperature deviation is
above high limit value.
Possible solid state relay failure.
Process
Shut Down
PROCESS
LOW TEMP
Process air temperature deviation is
below low limit value.
Possible heater failure.
Alert Only
PROCESS
LOOP BREAK
Process air temperature control loop is
unable to maintain the process air
temperature set point.
Possible Missing thermocouple, Failed
heater, Failed solid state relay.
Process
Shut Down
REGEN
HIGH TEMP
Regeneration air temperature deviation is
above high limit value.
Regeneration
Shut Down