Nilfisk-Advance SC500 - Solution System; Functional Description; Wiring Diagram

Solution System 104Service Manual – SC500
Solution System
Functional Description
The solution system supplies water and detergent to
the brush when cleaning the oor. The solution tank
is also the main machine body. There is a manual
valve on the left side of the tank to close the water
supply whenever maintenance must be performed on
the machine. The solution ows from the tank to the
tap, through the lter and solenoid valve (EV1) and
then to the brush deck.
The detergent pump (M4), present only on EcoFlex
systems, controls the ow of detergent from the Eco-
Flex tank which is then transported to the ow in the
main tube just before the solution enters the brush
deck.
The EcoFlex system can be selected with the specic
button on the dashboard instrument board (EB3).
The quantity of detergent is dened by the operator
via the buttons on the dashboard instrument board
(EB3).
Solution ow levels 1, 2 and 3 regulate the ow of
detergent solution on the basis of the machine speed
so as to keep the quantity of solution dispensed per
square metre of oor treated constant (for further de-
tails and modications, see the corresponding section
in the chapter Control System).
Located centrally, below the tank, there is also a hole
for draining any liquid in the battery compartment.
The solution ow is regulated by various timed ON /
OFF cycles, according to:
• Water ow rate regulation (0 - 4)
• Solution tank level
Both the solenoid valve and detergent pump (when
the EcoFlex system is enabled) follow the same tim-
ings.
The solenoid valve and detergent pump operate only
with the following inputs/conditions:
• Brush function on
• Forward paddle pressed
• Battery level not in condition with ashing seg-
ments.
Wiring Diagram
SOLENOID VALVE
(EV1)
DETERGENT PUMP
(M4)
M4
+
-
OUT
J5.3
J5.2
J5.1
J2.2
J2.1
J1.2
J1.1
Detergent pump power supply +
Detergent pump power supply -
Solenoid valve power supply +
Solenoid valve power supply -
Power supply for water level sensor +
Water level sensor return
Power supply for water level sensor -
B-
B+
FUNCTION
ELECTRONIC
BOARD (EB1)
WATER LEVEL
SENSOR (SW1)
Electronic board power supply +
Electronic board power supply -
Figure 1