Nilfisk SC370 43B Wartungshandbuch Seite 25

Service Manual- SC370
24 Electrical System
Functional Description
The batteries (2 x 12V) are connected in series and supply power to the machine through connector C1.
The battery charger (CH1) is connected to the machine by two connectors C2 and J3 (2-way signal connection).
The red and black cables (pin 1 and 3 of connector J3) are normally connected inside the battery charger CH1 when the
battery charger is not connected to the mains. When the battery charger is plugged into the mains, the connection
between pin 1 and 3 of connector J3 is broken, which will cause all machine functions to be disabled.
Fuses F1&F2 (20A) are connected in series between brush motor (M1) and Control board (EB2), as the brush motor
overcurrent protection; Fuse F3 (20A) is connected in series between vacuum motor (M2) and Control board, as the
vacuum motor overcurrent protection; Circuit breaker F4 (3A) is resettable and is connected in series between solenoid
valve (EV1) and Control board, as the solenoid valve overcurrent protection. All of them are located in the Control board.
To prolong battery life, the machine has low voltage cut-off function. When battery is of low voltage, the battery capacity
LED (red) flashes to alert the operator to charge the machine (the machine will power off automatically in 10 seconds if
not charged). Brush motor and vacuum motor can't work normally until the battery is fully charged or charged for more
than 2 hours.
Different battery type settings are of different low voltage cut-off threshold. See corresponding voltage values in the table
below. The battery charger can't identify what type of battery the machine is using via the Control board (EB2), so if the
battery type is changed, the charger battery type must be set accordingly via the dipswitch (SW1) inside the charger.
See relevant procedures in section "Maintenance and Adjustment" (on page 26).
Battery Type
LVC Voltage (V)
Reset Voltage (V)
The battery capacity is indicated by the battery capacity LED indicators, and the corresponding voltage value of each
battery capacity LED is shown in the following table:
Battery type
WET GEL/AGM
>22.0V >22.2V
20.4~22.0V 21.6~22.2V
<20.4V <21.6V
LED1
WET
20.4
DIS-EV
>23.2V
22.8~23.2V
<22.8V
LED2
LED3
AGM/GEL
21.6
24.5
LED status Description
Battery capacity is enough, machine can
Green LED3 on
work normally.
Battery capacity is not enough, machine
Yellow LED2 on
can work normally.
Battery capacity runs out, machine will
Red LED1 flashes
power off automatically in 10s.
24 Electrical System 24
DIS-EV
22.8