AEC Self Cleaning Continuous Filters - Manual (Page 34)

Self Cleaning Continuous Filter Chapter 6: Troubleshooting 33
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.
Problem Possible cause Corrective action
Missing bag, dust loss will be
constant not in synchronization
with valve blasts.
Locate and replace missing
bags.
Improperly installed bags.
Loose clamps or bag tops not
clamped between cages and
venturi collars. Constant dust
loss.
Reinstall bags and cages
properly.
Holes in bags from mechanical
damage during installation,
abrasion, thermal or corrosive
attack or wear. Generally in
synchronization with valve
blasts.
Replace worn or damaged bags
with bags made from filter
medium suitable for application.
Plugging venturis with 3”
diameter rubber plugs from the
clean air (plenum) side of the
collector is a quick temporary
measure until the bags can be
replaced.
1. Visible exhaust dust loss.
Dust in plenum after bags fail.
Always clean plenum before
installing new bags.
Piping leaks. Tighten fittings.
2. Insufficient air pressure. Additional usage from plant
system. Revise system to furnish
adequate air supply.