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 down
the dryer.
Process RTD Integrity – If
the process RTD is faulty, it
shuts down the dryer.
Regeneration RTD Integrity
– If the regeneration RTD is
faulty, it shuts down the dryer.
Possible cause
The hopper does not contain enough
material.
You are drying at a high drying tem-
perature (above 240°F {116°C}) or you
are running at low throughputs.
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 enclo-
sure 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 connections and
make necessary repairs.
Check the plug connection and tighten
if needed.
Replace the regeneration RTD.
Replace the control board.
6
Troubleshooting
Troublesho oti ng l 6-7
Shutdown Alarms
If the red Acknowledge Alarm LED is blinking red, the alarm is a shutdown
alarm. The dryer will shutdown 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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