Checker board Control Panel
21
3. Press and hold the START CLEAN button until
the indicator light above that button is lit. Use
the arrow keys to light the LED in the airflow
bar graph to the desired maximum airflow.
Start with the 10th light from the left as the
initial high flow setting. Press and hold the
START CLEAN button until the indicator LED
goes out.
4. Use the blower damper or other system airflow
control to reduce the system airflow to the
lowest airflow that will provide satisfactory
performance. Normally this is dictated by the
lowest airflow that generates transport velocity
in the duct. When you are satisfied that the
system is operating at its lowest practical
airflow condition, press and hold the STOP
CLEAN button until the indicator light above
that button is lit. Again, use the arrow keys to
locate and illuminate the light appropriate for
displaying the low flow condition. Use the first
or second light from the left end as a starting
point.
5. Press and hold the STOP CLEAN button until
the indicator light goes out. Press and hold the
airflow setpoint push button on the main
printed circuit board until the fault indicator
light goes out.
6. The computer automatically assigns values for
all the lights in the airflow light bar based on
calibration values registered by the procedure
above. The computer automatically assigns a
blower overcurrent value based on 120 percent
of the motor amp draw recorded at the time of
maximum airflow calibration setpoint.
7. This calibration procedure can be repeated to
change the light bar display or to compensate
for changes in the system. The only setpoint
that cannot be changed with this procedure is
the blower overcurrent value.
Note:
If you find that the blower overcurrent
fault light is displayed and ammeter
readings indicate the motor is operating
at less than the rating listed on the
nameplate, contact Donaldson for
assistance in reassigning the overcurrent
value in the computer.
Blower Rotation
If the fault light remains on after it has been
verified that the blower is rotating in the correct
direction, reverse leads 1 and 2 at one end of the
twisted pair wiring between the Current Sensor
and the Checker board.
