Chapter 7: Troubleshooting

7-1 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.

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.

7-2 Basic Troubleshooting

Problem

Possible Cause

Corrective Action

Little or no air

Dirty Filters

Clean or replace filters.

coming from

Desiccant beds contaminated by

Replace desiccant

process delivery

material or plasticizer leaking

 

tube.

into the system. See Sec. 6-6.

 

 

Blower fuse(s) blown.

Fix problem and Replace fuse(s).

 

Overload tripped.

Fix problem and reset the

 

 

overload.

 

Wrong motor rotation.

Turn off power. Reverse

 

 

incoming power.

 

Blower fins filled with dust or

Remove blower side plate, clean

 

contaminants.

baffles, replace.

Suction in delivery

Phase is reversed on power drop

Stop the Dryer.

tube, pressure from

coming into the dryer.

If the dryer was connected to the

the return tube.

 

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. Never change the phase at

 

 

the motor starters unless only one

 

 

of the two blowers is rotating

 

 

improperly.

Loss or reduction of

Process heaters are faulty.

Check for open or shorted heaters.

process air

 

Replace if required. Check the

temperature.

 

fuses.

 

Solid-state temperature controller

Replace.

 

faulty.

 

 

Process temperature was adjusted

Make sure that plant personnel are

 

in error by plant personnel.

aware of the proper temperature

 

 

set point. A sign posted next to the

 

 

control would be helpful.

Large Dehumidifying Dryers

Troubleshooting

64

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Sterling 882.00295.00 specifications Introduction, Basic Troubleshooting
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882.00295.00 specifications

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