Nilfisk-Advance SW900, Service Manual

Page: 39 / 137

Electrical and Control System 39 Service Manual – SW900
Functional Description (SW900 P)
The dynamotor (G) provides the current necessary
for the activation of the side broom motors (M2) and
(M3*), filter shaker circuit (M1) and hour counter
(HM)
The ignition key (KEY) turned to “0” inhibits the ac-
tivation of the engine, when turned to “1” it allows for
startup and operation
When the engine is turned on, the current generat -
ed by the dynamotor (G) directly activates the side
broom motors (M2) and (M3*)
On the same circuit of the ignition switch (KEY), there
is the hopper safety switch (SW0) which prevents the
activation of the engine if the hopper is not properly
positioned, or if the upper hood is open.
On the versions equipped with electrical filter shaker,
the dynamotor (G) powers also the filter shaker switch
(SW1) which, when pressed, activates the relay (K1).
The relay (K1) 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 optional hour counter (HM) is connected to the
key circuit (KEY) and is powered by the dynamotor
(G) when the engine is running
Electrical Protections
The dynamotor (G) is protected by the 20A fuse (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)
* : when the left broom is equipped