User guide

6
Troubleshooting
Troubleshooting l 6-11
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 entered on the operator
display.
Return Air Temperature
RTD Integrity – The dryer
continues to run with a passive
alarm. (The return air temper-
ature on W1600-5000 dryers
is measured at the inlet to the
desiccant wheel. W1600-5000
dryers designed prior to
August 2007, the return air
temperature is measured at the
inlet to the process blower.)
Wheel Rotation Failure - The
regeneration temperature
differential has been reached.
The default differential is 20ºF
/ 10 seconds.
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.
The wheel motor is not turning.
The belt tensioner is loose or the belt is
slipping.
The regeneration heater is not working.
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.
Check the motor, plugs, and fuses.
Change the tensioner spring or replace
the belt.
Check the heater fuses and heater.
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 cor-
rect 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 4-22, screen 59 for instructions.
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