Sterling 882.00295.00 specifications Alarm, Comment, Description, Effect

Alarm	Alarm	Alarm
Comment	Description	Effect
REGEN	Regeneration air temperature deviation is	Alert Only
	below low limit value.
LOW TEMP
	Possible heater failure.
DEWPOINT	The dew point sensor is out of range.	Disables
	Possible transducer or electronics	Switch on
SENSOR
	failure.	Dew Point
	The dew point value is above the high
HIGH	limit value. Faulty sensor or PC board.	Alert Only
DEWPOINT	Possible ambient air contamination or
	failed regeneration cycle.
PROCESS	Process blower is not running.	Process
BLOWER FAIL	Possible overload fault, contactor fault.	Shut Down
PROCESS	Process heaters are not active.	Process Shut
	Possible surface switch trip, redundant
HEATER FAIL		Down
	temperature safety trip.
REGEN	Regeneration blower is not running.	Regeneration
BLOWER FAIL	Possible overload fault, contactor fault.	Shut Down
REGEN	Regeneration heaters are not active.	Immediate
HEATER FAIL	Possible surface switch trip.	Shut Down
DIRTY FILTER	Monitored filter(s) require cleaning.	Alert Only
P RETURN	The process return air temperature	Disables
	thermocouple is out of range.	Over dry
SENSOR FAIL
	Possible thermocouple failure.	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.

Large Dehumidifying Dryers Operation 55