6
Troubleshooting
Troublesh oo ti ng l 6-7
Problem
Return Air High
Temperature – If the return
air temperature at the inlet to
the blower is greater than
180°F {82°C}, it shuts the
dryer down.
Process RTD Integrity – If
the process RTD is faulty, it
shuts the dryer down.
Regeneration RTD Integrity
– If the regeneration RTD is
faulty, it shuts the dryer down.
Possible cause
The hopper does not contain enough
material.
You are drying at a high drying
temperature above 240°F {116°C} or
you are running at low throughputs.
The aftercooler does not have enough
water.
The aftercooler coils are dirty.
The process RTD connection to the
control box is loose.
The connection in the electrical
enclosure for the process RTD is loose.
The connection of the RTD plug on the
control board is loose.
The process RTD has failed.
The control board has failed.
There is a loose connection in the wiring
leading to the RTD.
The connection of the RTD plug on the
control board is loose.
The regeneration RTD has failed.
The control board has failed.
Solution
Make sure your material supply system
is working properly.
Ensure water flow to the aftercooler.
Turn on the water supply, or fix any
leaks or blockages.
Clean the aftercooler coils. See
Maintenance section entitled, Cleaning
the aftercooler coils.
Check the connection to the receptacle
and tighten if needed.
Check the RTD plug connection and
tighten if needed.
Check the plug connection and tighten if
needed.
Replace the process RTD.
Replace the control board.
Check the RTD plug connection and
make the necessary repairs.
Check the plug connection and tighten if
needed.
Replace the regeneration RTD.
Replace the control board.
Shutdown Alarms
If the red Acknowledge Alarm LED is blinking, the alarm is a shutdown
alarm. The dryer will shut down automatically to prevent damage to the
equipment or personnel. Note that when the Acknowledge Alarm button is
pressed once, the blinking red LED becomes solid.
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