Sterling 882.00291.00 specifications Troubleshooting, 6-1Introduction, High Temp

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

15, 30, & 60 cfm Compact Dryers 37