Nilfisk-Advance SW900, Service Manual

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Electrical and Control System 38 Service Manual – SW900
Electrical and Control System
Functional Description (SW900 B)
The machine functionality check is mainly performed
by the battery charger (CH) that monitors the battery
voltage (BAT) (also) during machine operation (not
only during recharging)
The ignition key (KEY) provides to the battery char-
ger information about the machine on and off condi-
tion
When the ignition switch (KEY) is closed, the battery
charger checks the battery voltage and, if it is insuf -
ficient, it activates the electromagnetic switch (K0).
The activation of the electromagnetic switch (K0) is
cut off when the battery charger is connected to the
electrical mains
On the same circuit of the electromagnetic switch(K0),
there is the hopper safety switch (SW0) which pre-
vents the activation of the electromagnetic switch
(K0) if the hopper is not properly positioned, or if the
upper hood is open
For the versions equipped with electrical filter shak -
er, on the same circuit of the electromagnetic switch
(K0) there is the filter shaker switch (SW1). When
pressed, it turns off the electromagnetic switch (K0)
and activates the relay (K1)
The electromagnetic switch (K0) directly drives the
main motor (M0) and the side broom motors (M2) and
(M3*), while the relay (K1) (if equipped) turns on the
filter shaker motor (M1).
On the circuit of the side broom motors (M2) and
(M3*) there are microswitches (SW2) and (SW3*)
respectively, which deactivate the relevant motors
when the brooms are lifted from the ground by means
of the manual levers on the handlebar
The display on the control panel shows the battery
charge status and the battery charger by means of
the LED electronic board (EB1), which is directly con -
nected to the battery charger
The hour counter (HM) is connected in parallel to the
electromagnetic switch (K0) and it counts the operat-
ing time of the main motor (M0)
The machine system is connected to the battery with
the connector (C1) The battery charger is always con-
nected to the batteries
* : when the left broom is equipped
Electrical Protections
The main motor (M0) is protected by the 70A circuit
breaker (FA)
The side broom motors (M2) and (M3*) are protected
by 5A circuit breakers (FB) and (FC*) respectively
The filter shaker motor circuit (M1) is protected by
the 5A fuse (F1)
The battery charger (CH) is protected by the 30A fuse
(F2)
The main battery wiring harness is protected by a
125A safety fuse (F0) (on the supported versions)