Sterlco BP 1000 Series Beside the Press Granulators - Manual (Page 30)

1000 Series Granulators Chapter 6: Troubleshooting 30 of 45
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 by 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.
6-2 Electrical Faults
Problem Possible Cause Possible Remedy
Motor Fails to Start Supply failure Check fuses
Starter inoperative Check main supply
Starter overloads or cuts out Check motor requirements
and adjust accordingly
Safety switches inoperative Check and adjust as needed
Motor starts but will not take
load Too much belt tension Check belt tension and adjust
as necessary
Incorrectly connected motor Check terminal connection
with manufacturer’s
connection diagram and
adjust as necessary
Defective starter winding Check current in each phase
with ammeter, if there is a
marked difference in current
in one phase, contact motor
manufacturer
Motor will start when
disconnected from load but
not when connected Worn bearings Check and replace if
necessary according to
manufacturer’s literature