Scrub System: Disc, Cylindrical, & Boost
57
Service Manual – Focus II / Scrubtec R6 Rider Autoscrubber
The Main Machine Controller monitors the performance of the brush motor(s) by observing the voltage drop
across the negative power wire leading to the motor. The more current flowing through the wire, the larger
the voltage drop. The controller uses this voltage reading to calculate the amperage running through the
motor.
The controller uses this calculated amperage to determine the scrub pressure of the deck. The controller
then raises and lowers the height of the scrub deck to keep the brush motor amperage within its desired
range.
Deck Lift Actuator
The deck lift actuator is powered directly from the Main Machine Controller. The Main Machine Controller
needs to reverse the polarity and power level to this motor in order to raise and lower the deck in very small
amounts to maintain pressure. The signal from the controller is reversible Pulse-Width Modulated (PWM).
(Refer to the
described on page 79 for more information on PWM control.)
The deck lift actuator contains two additional position switches (S5 & S6) not found in other actuators on
the machine. These switches provide position feedback to the controller, so the controller knows the height
of the deck independently from the amperage load on the brush motor(s). This permits the controller to set
the initial deck height more accurately than just approximating the position based on how long the motor
rotates. These switches are normally open, and they close when the respective position is reached.
A1 MAIN MACHINE
CONTROLLER
J3-1 B+
J3-8 B+
J3-14 KEY SWITCH
SEAT
SWITCH J3-4
3
4
S1
KEY SWITCH
1
2
BT1
BATTERY, 24 VDC
+
-
L1
SOLUTION SOLENOID VALVE
1
2
CB2
CIRCUIT BREAKER
10 AMP
1
2
K2
BRUSH CONTACTOR
E-STOP
SWITCH
S4
1
2
S2
SEAT SWITCH
2
1
F1
FUSE, 150A.
1
2
DECK POSITION-2 J2-11
DECK POSITION-1 J2-12
BRUSH MOTOR SENSE
SCRUB DECK
MOTOR OPTIONS
OPTIONAL
M
M7
M
M4
DECK LIFT ACTUACTOR
-
+
M
M8
K2
CONTACTOR, BRUSH
1
2
M
M2
DETEGENT PUMP
+
-
M
M9
B- J1-8
S5
S6
LEFT DISK OR CYLINDRICAL
RIGHT DISK OR CYLINDRICAL
CENTER DISK OR BOOST
Reversible PWM
Vacuum Motor
Current Sense
by Voltage Drop
Effective Resistance
of Ground Wire
Reversible PWM
