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

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Sterling 882.00295.00 specifications Shutdown

882.00295.00 specifications

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