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15, 30, & 60 cfm Compact Dryers Chapter 6: Troubleshooting 42 of 51
Chapter 6: Troubleshooting
6-1 Introduction
The utmost in safety precautions should be observed at all times when working on or around
the machine and the electrical components. All normal trouble-shooting must be
accomplished with the power off, line fuses removed, and with the machine tagged as out of
service.
The use of good quality test equipment cannot be over-emphasized when troubleshooting is
indicated. Use a good ammeter that can measure at least twice the AC and DC current that
can be encountered for the machine. Be sure that the voltmeter has at least minimum
impedance of 5,000 OHMS-per-volt on AC and 20,000 OHMS-per-volt on DC scales.
Popular combination meters, VOM and VTVM can be selected to provide the necessary
functions.
Before making haphazard substitutions and repairs when defective electrical components are
malfunctioning, we recommend that you check the associated circuitry and assemblies for
other defective devices. It is common to replace the obviously damaged component without
actually locating the real cause of the trouble. Such hasty substitutions will only destroy the
new component. Refer to wiring diagrams and schematics.
Locating mechanical problems, should they occur, is relatively straightforward. When
necessary, refer to the parts catalog section.
Problem
Possible cause
Corrective action
Dirty filter.
Clean or replace filter.
Desiccant beds are contaminated
by material or plasticizer leaking
into the system.
Replace desiccant. See Page 38
for more information.
Blower overload has tripped.
Fix the problem and reset the
overload. Possible open fuse,
loose wire.
Little or no air coming from
the process delivery tube.
Blower fins filled with dust or
contaminants.
Remove blower side plate,
clean baffles, replace.
Phase is reversed on power drop
coming into the dryer. (Only on
3 phase units.)
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.
Suction in delivery tube,
pressure from the return tube.
Wrong delivery and return
connections.
Reverse hoses. See air flow
diagram on Page 12.
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