Donaldson Company, Inc.
26
Troubleshooting, continued
Problem
Probable Cause
Remedy
Filter Pressure Drop bar
graph out of calibration
One of the tube fittings
on the pressure sensor
has broken loose from
the substrate
If the pressure sensor is mounted on the top of the
printed circuit board, the tube can be remounted with
cyanoacrylate adhesive. If mounted on the bottom of
the printed circuit board, replace board.
Leaking or plugged
pneumatic fitting or
lines
Correct leaks, loose fittings, kinked, or pinched air
lines. Use compressed air to blow dust in lines back
into dust collector. Clean or blow out plugged fittings.
Plugged pneumatic
safety filter
Replace the line filter that protects the pressure
sensors.
w
ero point calibration
error
The microprocessor recalibrates the zero point every
time the board goes into the active mode. If the
blower is already operating when the board enters the
active mode, or if there is any pressure on either side
of the Delta P sensor, the calibration will be incorrect.
To correct, turn the blower OFF leaving the Checker
board powered and in the inactive mode for two
minutes. Check that the Checker board enters the
active mode before or at the same time as the blower,
or disconnect the tubing from the Checker board
before going into the active mode.
Damaged sensor due
to overpressure.
Sensor rated for a maximum pressure of 6 psi
(41kPa). Replace the Checker board.
No display or all lights
illuminated on Filter
Pressure Drop Bar
d
raph
display
Incorrect pneumatic
tubing connections
Reverse the tubing connections. Safety filter must be
in the dirty-air chamber
D
s tube.
Clean filters
Unseasoned filters may not have sufficient pressure
drop to illuminate even the first LED. Recheck after
operating under load.
