User guide

6
Troubleshooting
Shutdown Alarms
If the red Acknowledge Alarm LED is blinking, the alarm is a shutdown
alarm. The dryer will shutdown automatically to prevent damage to the
equipment or personnel. Note that once the Acknowledge Alarm button is
pressed once, the blinking red LED becomes solid.
Troubleshooting l 6-5
✐
NOTE: Some alarms can be set for shutdown or passive (screen 59, page 4-22).
These alarms may be listed in both sections.
Problem
Regeneration Heater High
Temperature – The snap
switch in the regeneration
heater tube activated due to
excessive temperature.
Return Air High
Temperature – If the return
air temperature at the inlet to
the blower is greater than
120°F {49°C}, it shuts down
the dryer. (The return air tem-
perature on W1600-5000 dry-
ers 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 blow-
er.)
Possible cause
The regeneration exhaust is blocked or the
air hoses are loose.
The regeneration blower is not running or
running in the wrong direction.
The isolation contactor failed in the
closed position.
The heater solid state relays (SSRs) failed.
The regeneration heater output on the
board has failed.
The hopper does not contain enough
material.
You are drying at a high drying tempera-
ture above 120°F {49°C} or you are
running at low throughputs.
The aftercooler/intercooler does not
have enough water.
The aftercooler/intercooler coils are
dirty.
Solution
Locate and remove any airflow
restrictions.
Tighten any loose hoses.
Correct the cause of the non-running
blower (fuse, etc.) or reverse the rotation
of the blower.
Replace the isolation contactor.
Replace the failed heater solid state
relays (SSRs).
Replace the board.
Make sure your material supply system
is working properly.
Ensure water flow to the
aftercooler/intercooler.
Turn on the water supply, or fix any
leaks or blockages.
Clean the aftercooler/intercooler coils.
See Maintenance section entitled,
Cleaning the aftercooler/intercooler
coils.