15
ACT Dust Collectors
Troubleshooting
Problem
Probable Cause
Solution
Poor performance - not enough
suction or air movement
Fan rotation in wrong direction
Rewire three phase wires to
change fan rotation
Closed damper or obstruction in
airstream
Slowly open damper or remove
obstruction
VFD
Verify settings and operating
speed
System design
Verify fan performance to fan
curve with airflow, static pressure,
and amperage readings
Re-evaluate system design to
verify that the fan is properly sized
for the application or nothing has
changed since product selection
(i.e. added a new weld station)
System effects
Check along the duct system to
ensure that there is no abrupt
changes in airflow (i.e. inlet box
with no turning vanes, mitered
elbow with no vanes, etc.)
Filters at end of life
Replace filters
Not enough compressed air
Verify that the pressure is high
enough for effective cleaning (set
to 80-90 psi)
High differential pressure
Dirty filters
Activate cleaning by reducing the
"high limit" or manually pulse by
following the instructions in timer
board manual
Replace filters near end of life
Not enough compressed air
Verify that the pressure is high
enough for effective cleaning (set
to 90-100 psi)
Defective cleaning system
Verify solenoids, diaphragm
valves, and timer board are
functioning and properly wired
Motor over-amping
Fan design
Overloading radial-bladed fans
may require a damper to reduce
the horsepower requirements
Electrical
Verify correct motor supply voltage
Fan/motor sized incorrectly
Confirm system requirements with
airflow measurements
Replace fan with larger unit
