Troubleshooting l 6-9
Alarms
• Shutdown (A#): The dryer has automatically shut down because it has detect-
ed a serious problem that could damage your material or dryer.
• Passive (P#): The dryer continues to operate, but warns of a problem that could
prevent correct drying of your material. If ignored, this problem could lead to a
condition that will shut down the dryer.
Problem
A22 & P2 - Process Low
Temperature – The process
temperature is less than the
low temperature setpoint for
the specified time. Default
values are 70°F {21°C} for
20 seconds.
A23 & P3 - Regeneration
Temperature Deviation –
The regeneration temperature
exceeds the deviation band for
the specified time. Default
values are 10°F {6°C} for 5
seconds.
Possible cause
Precooler water is too cold, or the water
flow rate is too high.
The output on the board has failed.
Flow control solenoid is stuck open.
The process RTD is loose or has fallen
out.
Process heater has failed.
One of the solid state relays (SSRs)
failed.
The regeneration RTD is loose or has
fallen out.
The air hose connections are loose.
The output on the board has failed.
Defective heater.
Solution
Check water temperature and flow
settings. Adjust as necessary.
Replace the board.
Replace the valve.
Check the process RTD and tighten if
needed.
Check the heater fuses and resistance
across each leg of the process heater.
Replace the failed solid state relays
(SSRs).
Check the regeneration RTD and tighten
if needed.
Tighten all air hose connections.
Replace the board.
Check the heater fuses and resistance
across each leg of the regeneration
heater.
6
Troubleshooting
When supplied for central drying applications, these shutdown alarms are not available.
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