6-16 l Troubleshooting
Problem
Process Filter Clogged
(Option) – The process filter
differential pressure switch is
tripped.
CFM Low (Option) - The
CFM calculated from the
process blower differential
pressure is less than the set-
point (1 CFM for 30 seconds -
see screen 66) entered on the
operator display.
Return Air Temperature
RTD Integrity – The dryer
continues to run with a passive
alarm.
Machine Loader Conveying
Demand (MDC Option) - The
demand sensor located at the
material receiver has not been
satisfied after three consecutive
attempts.
Possible cause
The process air filter is clogged.
The air hoses are loose, blocked, or
kinked.
The return air filter needs cleaned.
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.
Sensor is out of position.
The sensor is not adjusted properly.
No material is being conveyed.
The conveying load time is too short or
the delay time is too long.
Solution
Remove and clean or replace the process
air filter.
Check the process air hose for secure
connections, straighten any blocked or
kinked hose.
Clean and/or change the return air filter.
Check the RTD plug connections and
make any necessary repairs.
Check the plug connection and tighten if
needed.
Replace the return air RTD.
Replace the control board.
Raise the sensor to a higher / lower posi-
tion on the bracket.
Adjust the sensitivity of the sensor.
Check for material in the hopper. Make
sure the slidegate is not closed.
Increase the load time setpoint or short-
en the delay time.
Passive Alarms
If the amber Acknowledge Alarm LED is blinking, the alarm is a passive alarm.
The dryer continues to operate, but this problem could prevent correct drying of
your material. Note that once the Acknowledge Alarm button is pressed once, the
blinking amber LED becomes solid.
NOTE: Passive alarms can be configured as shutdown alarms (see the previous Shut-
down Alarms section). See page 4-26, screen 62 for instructions.
✐
(continued)
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