56
- FORM NO. 56043071 CMAX
™
28/34ST / I-MAX
™
28/32C, BA 750/850ST, BA 750C
ELECTRICAL SYSTEM
FUNCTIONAL OVERVIEW OF MAIN CONTROL BOARD
The primary function of the main control board is to position the scrubbing brushes with respect to the floor surface using a lift actuator motor to maintain the correct
brush pressure and current draw of the brush motor. See Figure 5. When the Scrub On/Pressure Increase Button
(G)
is depressed this will lower the scrub deck
to the operating position and by pushing or pulling the operator drive paddle start the brush motors. The controller is continuously monitoring the current to the
brush motors and when it senses a current draw out of the desired range it automatically raises or lowers the brush deck by turning on the brush actuator motor.
This process is repeated until the brush motors are shut off. The controller also manages the other supportive systems such as the solution on/off and vacuum
motor. Note: See the Know Your Machine section in this manual for a complete explanation of the machine’s operation.
DESCRIPTION OF CONTROL PANEL SYSTEM OVERLOAD INDICATORS
•
If the scrub motors or the scrub deck lift actuator become overloaded, the scrub and solution systems will turn off and the scrub-off/pressure-
decrease indicator will flash red at a fast rate (four times per second).
•
If the vacuum motor becomes overloaded, the scrub, vacuum, and solution systems will turn off and the vacuum indicator will flash yellow
at a fast rate (four times per second).
•
To reset an overload condition, turn the key switch off and then back on.
Service Note:
Read the service test mode instructions (found in this manual section) for additional control panel indicator (light) functions. The
service test mode indicator lights are displayed when a service technician enters into this main controller program option to help in electrical
troubleshooting.