Specifications

Portable Drying/Conveying Systems Chapter 6: Troubleshooting 58 of 76
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
VALVE
POSITION
FAULT
The limit switch on
the valve may not
have been wired
correctly.
The switch is indicating the
incorrect desiccant tank is in
regeneration. Check the wiring
of the switch against the wiring
diagram. Make sure all the
wire connections are tight.
- Dryer Shuts down:
- Process blower OFF.
- Process heaters OFF.
- Regen heaters OFF.
- Alarm light is ON
- Alarm horn is ON.
Limit switch may be out of
position. Re-adjust the switch
to make sure it trips when it is
at the high position, and it
does not touch the cam when
it is at the low position.
VALVE MOTOR
OVERIDE
The valve has made
enough rotations
and the correct
position of the valve
was not detected.
Limit switch may be faulty.
Replace the switch and make
sure the wires are connected
correctly.
- Dryer Shuts down:
- Process blower OFF.
- Process heaters OFF.
- Regen heaters OFF.
- Alarm light is ON
- Alarm horn is ON.