Sterling 882.00379.00 manual Introduction, Problem Possible Cause Possible Remedy

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.

Note: Refer to specific control panel operation and instruction manual for additional details and Troubleshooting information.

Problem	Possible Cause	Possible Remedy
		Reset the overload and check
	The motor overload tripped.	the motor for the proper amp
		draw as listed on the serial
		tag.
The pump doesn’t run even	No demand signal/stations	Check control panel.
	offline.
though it is on line.
	Control panel problem.	Verify wire connections.
(Refer to enclosed Control
		Inspect output cards.
Panel Manual)
	Main fuse in power drop or	Replace the fuse.
	optional fused disconnect
	has blown.
		Check for 3-phase voltage.
	Motor contactor is faulty.	Repair or replace as
		required.

Conveying System Mechanical Components Chapter 6: Troubleshooting 94 of 138