Control System; Functional Description - Nilfisk-Advance Advance SC370 Service Manual

Service Manual- SC370

04 Control system 13

04 Control System

Functional Description

The machine utilizes a Dashboard (EB1) to turn on various machine functions and a Control board (EB2) to control
outputs. When Dashboard (EB1) receives inputs from operator, it activates various components and functions
accordingly.
Press the one-button start (S3) on Dashboard (EB1) to turn on/off the machine. And press the vacuum button (S2)
on Dashboard (EB1) to turn on/off the vacuum motor (M2). Press the vacuum button (S2) for 1 second to switch
between normal mode and silent mode. The control signal is transmitted to Control board (EB2) via port J1-6 (vacuum
PWM) to control the on/off/vacuum level of vacuum output.
When the machine is turned on, the brush motor (M1) and solenoid valve (EV1) are on standby. When the safety
switch is pressed, the control signal is transmitted to Control board (EB2) via port J1-5 (brush PWM) and J1-7 (Water)
to activate the output of brush motor and solenoid valve. Press the flow increase switch (S5) and flow decrease
switch (S6) on Dashboard (EB1) to select the solution flow level.
Press the ECO mode button (S1) on Dashboard (EB1) to make the brush motor (M1) and vacuum motor (M2) work
in ECO mode by lowering their voltage via PWM regulation. The control signal is transmitted to Control board (EB2)
via port J1-5 (Brush PWM) and J1-6 (Vacuum PWM) to control the output of brush motor and vacuum motor. And
press the brush release button (S4) on Dashboard (EB1) to control the Control board (EB2) to release the brush via
brush motor.
The Control board (EB2) provides +24V and B- power for Dashboard (EB1). And the Dashboard (EB1) controls the
main relay on Control board (EB2). When the battery polarity is connected reversely, the Control board (EB2) can't
provide +24V for Dashboard (EB1), and will cut off the B+ power from main relay to the load.
The Dashboard (EB1) also shows battery capacity and error messages through the battery capacity LED indicators
and one-button start LED indicator.
Vacuum output
S5
Brush output
S1
S3
S2
Solenoid valve output
S6
S4
Control board (EB2)
Dashboard (EB1)