Electrical System
43
Service Manual – SC3000
Electrical System
Functional Description
The batteries (two 12V or four 6V) are connected in series by bridge cables.
(For Nilfisk scrubbers version only) One of the bridge cables has a safety fuse (F0).
If the voltage at battery connector (C1) = 0V, check the continuity of the cable with the fuse (F0) (for Nilfisk
scrubbers version only). In case of a break in continuity, replace the cable.
The battery charger (CH) is connected to the machine by two connectors (C) (power connection to the batteries)
and C3 (3-way signal connection).
(
Only for SPE Charger
) The grey cables (terminals
1 and 2 of connector C3) are short-circuited in battery
charger
(CH)
when it is not connected to the electri
-
cal mains. If this connection is not made, all machine
functions are disabled.
The yellow cable (terminal 3 of connector C3) is the
data cable between board (EB1) and battery charger
(CH). This connection is used to set battery charger
charging curves directly on the machine dashboard
and displays the state of the battery charger when
charging, on the 3 battery dashboard LEDS:
Red LED lit = main charging phase
Yellow LED lit = equalization phase (charge comple-
tion)
Green LED lit = charging phase successfully complet-
ed
(
Only for Delta-Q Charger
) The terminal 2 of con-
nector C3 is shorted to the b (B+) internally
to the charger when it is not connected to the electri
-
cal mains. If this connection is not made, all machine
functions are disabled.
If the optional battery charger has not been installed, the relevant bridge must be used on connector C3.
Battery charger
The SC3000 may be equipped with an optional onboard battery charger. Depending on the market area and
when the machine was manufactured, the charger may be an SPE charger or a Delta-Q charger.
SPE
DQ
SPE charger
Delta-Q charger
