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Large Dehumidifying Dryers Operation 55
Alarm
Comment
Alarm
Description
Alarm
Effect
REGEN
LOW TEMP
Regeneration air temperature deviation is
below low limit value.
Possible heater failure.
Alert Only
DEWPOINT
SENSOR
The dew point sensor is out of range.
Possible transducer or electronics
failure.
Disables
Switch on
Dew Point
HIGH
DEWPOINT
The dew point value is above the high
limit value. Faulty sensor or PC board.
Possible ambient air contamination or
failed regeneration cycle.
Alert Only
PROCESS
BLOWER FAIL
Process blower is not running.
Possible overload fault, contactor fault.
Process
Shut Down
PROCESS
HEATER FAIL
Process heaters are not active.
Possible surface switch trip, redundant
temperature safety trip.
Process Shut
Down
REGEN
BLOWER FAIL
Regeneration blower is not running.
Possible overload fault, contactor fault.
Regeneration
Shut Down
REGEN
HEATER FAIL
Regeneration heaters are not active.
Possible surface switch trip.
Immediate
Shut Down
DIRTY FILTER Monitored filter(s) require cleaning. Alert Only
P RETURN
SENSOR FAIL
The process return air temperature
thermocouple is out of range.
Possible thermocouple failure.
Disables
Over dry
Protection
5-5 Shutdown
To prolong the life of the process air heaters and desiccant beds, the following procedure
should always be used to shut down the dryer. In an emergency situation, turning off the main
power disconnect will have the immediate effect of stopping all of the dryer’s systems, but
this is not the preferred method for shutting down the system.
1. On the Dryer Status screen, press the SHUT DOWN button to shut down the dryer.
The process heater will shut off. The process blower will shut off after ??? minutes
and the regeneration blower will shut down. The bed regeneration process will be
completed. When the dryer is re-started, the process air will be directed through the
bed that was regenerated last.
2. When processing is complete, close the hopper slide gate and shut down any in-line
companion equipment, such as aftercoolers.
3. Empty the drying hopper, if desired.
If the dryer is turned off manually (by turning off the dryer without using the above shut-
down procedure), the dryer will stop immediately. When the dryer is re-started, the process
air will be directed through the last bed that was being used when the dryer control switch
was turned off. If a bed was being regenerated when the dryer control switch was turned off,
the regeneration process will start over on the same bed. This may cause the dewpoint to
become bad for that desiccant tank.