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15, 30, & 60 cfm Compact Dryers Chapter 6: Troubleshooting 43 of 51
Problem
Possible cause
Corrective action
Process heaters are faulty.
Check for open heaters. Replace
if required.
Solid-state temperature
controller faulty.
Replace.
Loss or reduction of process air
temperature.
Process temperature was
adjusted in error by plant
personnel.
Make sure that plant personnel
are aware of the proper
temperature set point. Post an
appropriate sign next to the
controller.
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 a different
drying temperature.
Break in flex hose to/from
drying hopper.
Inspect for air leaks; replace as
needed.
Airflow valve sticking or failing
to shift.
Check for proper operation of
valve actuators. Repair or
replace if necessary.
Remove blower side plate,
clean baffles, replace.
Loss or reduction in drying
capacity.
Blower fins filled with dust or
contaminants.
Replace filter elements.
Process temperature set too high
due to operator error.
Check resin manufacturer’s data
sheet for proper drying
temperature. Make sure plant
personnel are aware of the
correct process temperature set
point.
High temperature alarm not set
properly.
Reset high temperature alarm.
Process set point is out of
acceptable range.
Restore temperature controller
to factory pre-sets.
Function set for degrees Celsius
(ºC), set point at degrees
Fahrenheit (ºF).
Verify correct Celsius or
Fahrenheit settings.
Material in drying hopper cakes,
or meltdown occurs.
Process thermocouple not in
airflow.
Verify that the thermocouple is
properly installed in the inlet
tube.
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