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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.
Alarm Message Cause Corrective Action Dryer Status
Make sure the process filter
is clean. Clean or replace if
necessary.
The process
temperature has
exceeded the alarm
set point.
Double check the alarm set
point.
Check the positioning of the
thermocouple inside the air
inlet of the drying hopper.
The high temperature
snap switch of the
process heater box
has tripped.
The tip of the thermocouple
should be centered to the
tube, and not touching any
metal part of the tube.
The drying temperature set
point is lower than dryer
capabilities. Check the dryer
specs.
Make sure all the hose
connections are tight.
HIGH TEMP
The high temperature
snap switch on of the
regeneration heater
boxes has tripped
Make sure the regeneration
timing cycle matches the
specs. If not contact Service
department.
- Dryer Shuts down:
- Process blower OFF.
- Process heaters OFF.
- Regen heaters OFF.
- Alarm light is ON
- Alarm horn is ON.
15, 30, & 60 cfm Compact Dryers 37