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.
6-12 l Troubleshooting
Problem
A33 & P26 - Regeneration
RTD Integrity – If the regen-
eration RTD is faulty, it shuts
down the dryer.
A34 & P28 - Return Air
Temperature RTD Integrity
– The dryer continues to run
with a passive alarm.
A35 & P8 - Regeneration
Temperature Loop Break –
The regeneration temperature
is outside of the operator
entered deviation alarm
band (see Regeneration
Temperature Deviation
passive alarm) and the regen-
eration temperature is not
moving towards the setpoint at
a rate greater than specified.
Default values are 2°F {1°C}
over 40 seconds.
Possible cause
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.
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 return air RTD has failed.
The control board has failed.
The regeneration heater has failed.
The regeneration RTD is loose or has
fallen out.
The regeneration blower is not running.
The output on the control board has
failed or the fuse is blown.
.
Solution
Check the RTD plug connections,
make necessary repairs.
Check the plug connection and tighten
if needed.
Replace the regeneration RTD.
Replace the control board.
Check the RTD plug connections,
make necessary repairs.
Check the plug connection and tighten if
needed.
Replace the return air RTD.
Replace the control board.
Check the heater fuses, and resistance
across each leg of the process heater.
Check the regeneration RTD and tighten
if needed.
Correct the cause of the non-functioning
blower.
Replace the control board or fuse.
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