Troubleshooting
29
Chapter 6:
Troubleshooting
Problem
Possible cause
Corrective action
Little or no air coming from
the process delivery tube.
Dirty filter.
Clean or replace filter.
Desiccant beds are
contaminated by material or
plasticizer leaking into the
system.
Replace desiccant.
Blower overload has tripped.
Repair the condition and
reset the overload.
Blower fins filled with dust or
contaminants.
Remove blower side plate,
clean baffles, replace.
Suction in delivery tube,
pressure from the return
tube.
Phase is reversed on power
drop coming into the dryer.
Stop the dryer.
If the dryer was connected to
the drying hopper, check to
see if the desiccant and
process air heater has been
contaminated with resin.
If so, replace the desiccant
and remove any resin carry-
over. Otherwise, change the
phase of two legs of the
three-phase power drop.
Loss or reduction of process
air temperature.
Process heaters are faulty.
Check for open heaters.
Replace if required.
Solid-state Relay faulty.
Replace Solid State Relay.
Process temperature was
improperly adjusted.
Review product for proper
setting. Train plant personnel
about proper temperature set
point and operation.
Loss or reduction in drying
capacity.
Process heaters are faulty.
Replace.
Desiccant beds are
contaminated.
Replace desiccant.
Material being dried differs
from material specified at the
time of purchase.
Drying systems are designed
for the material which was
originally specified. Different
materials may need a longer
residence time or different
drying temperature.
Break in flex hose to/from
drying hopper.
Inspect for air leaks; replace
if necessary.
