Scrub System, Disc - Nilfisk-Advance SC450 Service Manual

Service Manual – SC450

Scrub System, Disc

Functional Description
The disc brush system can be started by the operator
The disc brush turn counter-clockwise
The brush system, when turning, cleans/washes the
floor surface and assist machine forward movement.
The deck, where brushes suitable for cleaning the
particular type of floor are installed, is the main part
of the brush system. The brush deck is fixed and in-
tegrated in the machine with a support plate On the
support plate, there are two handwheels to adjust the
machine straight forward movement and speed
The brush working pressure is functional to the ma-
chine designed balance
The brush motor (M1) is supplied by the electromag-
netic switch (ES1) which is driven by the function
electronic board (EB1) when the switches (SW1) and
(SW3) are closed The circuit is protected by the brush
fuse (F1) and by the electronic protection system de-
scribed in the Function Electronic Board Specifica-
tions, in the Control System chapter.
The system, once activated, uses the solution coming
form the solution system, to wash the floor.
In case of brush motor overload, a safety system stops
Wiring Diagram
BRUSH ACTIVATION
PUSH-BUTTON (SW3)
J2.7 - Power supply (+)
FUNCTION ELECTRONIC
BOARD (EB1)
BRUSH
SWITCH (SW1)
24V
J1.1 - Switch power supply
J1.8 - Brush system switch
SOLENOID VALVE AND
ELECTRONIC BOARD FUSE (F3)
J1.2 - Brush switch
24V
J2.2 - Brush relay power supply
J2.1 - Relay power supply
J2.5 - Brush motor current detection (+)
BRUSH MOTOR
ELECTROMAGNETIC
SWITCH (ES1)
J2.4 - Brush motor current detection (-)
J2.6 - Power supply (-)
the brushes after about one minute of continuous
overload The overload is shown by the three battery
warning LEDs flashing simultaneously.
The overload is detected by monitoring the current
flow on the motor. The current is measured by check-
ing the voltage drop through the brush fuse (F1) If
the voltage drop is higher than 40 mV, the 3 battery
LEDs flash simultaneously and, if the overload per-
sists, the motor stops after a variable delay, depend-
ing on the overload amount
To start scrubbing again after a brush stop due to
overload, turn off and then on the machine with the
brush switch (SW1)
To work properly, the brush motor needs the follow-
ing:
• Brush switch (SW1) turned on
• Push-button (SW3) pressed
• Charged battery (the red LED must not be flash-
ing)
B -
Scrub System, Disc
BRUSH
MOTOR (M1)
BRUSH MOTOR
ELECTROMAGNETIC
SWITCH (ES1)
BRUSH MOTOR
FUSE (F1)
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