AAF International ArrestAll - Manual (Page 6)

6
7.0 Troubleshooting
7.1 Visible Discharge
Improperly Installed Cartridge
Insure the cartridge is properly locked and sealed in position. Check
for worn or torn pockets and replace cartridge if required. Check for
possible damage to the cartridge sealing gasket.
7.2 Insufficient Suction or Exhaust
High Pressure Drop
See cartridge problems.
Fan Direction of Rotation
The incorrect fan rotation will not provide sufficient static pressure or
volume and could cause motor overload.
Leaks
Infiltration of air from leaking ductwork, access doors, explosion vents,
dust discharge devices, or housing will cause insufficient suction.
Seal any leaks.
Closed Air Passages
Clogged ducts or closed dampers or gates will shut of f or reduce
the airflow.
Undersized Ducts
Duct size should be per the design specification. Undersized ducts
produce high static pressure, restricting the airflow.
Improper Shaker Cycle
Check the electrical components of the automatic shaker for correct
operation. Adjust shake time if required (normally 15-20 seconds).
Check for mechanical restrictions, which could hinder the performance
of the shaker.
7.3 Cartridge Problems (Blinding, Poor Life, Failure, etc.)
Checks and Remedies
1. Check actual operating temperature of system against
design temperature.
2. Check for high operating humidity, free moisture, etc. Check for
low relative humidity and static electricity.
3. Check for shrinkage or stretching.
4. Review physical and chemical characteristics of collected dust,
gas stream, and fabric.
5. Check for material bridging in bin. Material build-up into cartridge
area can overstress the element.
6. Incorrect cartridge installation can cause wear by allowing friction
between adjacent elements or between outside elements. Adjust
as required.
7. Check for system design changes in air volume, dust loadings, etc.
Adjust as required.
7.4 Electrical
Shaker Motor Does Not Operate
Verify that the shaker motor is operable. If it is, make the following
electrical checks.
1. Confirm that the selector switch (SS) is in “HAND” or
“AUTO” position.
2. Verify line voltage at Terminals 1L1, 1L2, and 1L3 and control
voltage (115 volts) from control transformer.
3. Check that shaker overload 2OL is not tripped.
4. Check that shaker motor fuses F4, F5, and F6 are not blown.
5. If selector switch ‘SS’ is in the “AUTO” position, verify that fan
starter (1M) Aux N.C. contact is closed and there is power at
terminal 4. If selector switch ‘SS’ is in the "HAND" position,
check for power at terminal 4.
6. If all of the above steps check out okay, the next check is for a
faulty shaker timer (SSTM). A faulty shaker timer (SSTM) may be
determined by disconnecting wire numbers ‘4’, ‘7’, and ‘N’ from the
timer. Place a jumper between wire numbers ‘7' and ‘N'. If shaker
motor energizes, shaker timer (SSTM) should be replaced.
Notes:
1. Weights listed do not include crating and/or packaging.
2. Cartridge ships installed.
3. After-filter weight excludes filter.
4. After-filter ships separately in cardboard carton.
5. Inlet transition (if supplied) ships separately.