Sterling 882.00722.00 manual Troubleshooting, Introduction

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.

Figure 53: Typical Troubleshooting Problems and Suggested Corrective Actions

Problem

Corrective action

	Check to make sure that air is hooked up and the regulator gauge
	reads at precisely 60 PSI.
Nothing happens when I start
the extruder
	Look on the Recipe Screen. If you don’t see a displayed Extruder
	RPM then check the inductive proximity switch. If you do see a
	displayed RPM then check the hopper’s calibration
“Interface has been Locked” is	Click “Unlock” and enter in your User Password.
shown
I’ve forgotten my User	Contact the Service Department.
Password
PLC Battery Low	Change out the PLC with your spare and reprogram new unit.
	Send old PLC back to Manufacturer for repair.

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