Husqvarna RB150 Workshop Manual page 39

In the "Aut" mode, the cutting unit stops when
the grass collector is full
See fig. 6.
S5 makes when static pressure in the grass
discharge chute has risen to the preset value (ie, the
grass collector is full). Relay K1 is activated and
breaks the earthing circuit to clutch 5 of the cutting
unit. Relay K1 remains in the activated mode since
its operating coil now receives power via S6.
The circuit is reset by pressing and releasing S1.
This breaks the earthing circuit to the operating coil
of relay K1 and the relay returns to its non-activated
mode and the cutting unit starts again.
Bold dotted line = Path of the current when ignition
is switched on.
Bold line = Path of the current in this example.
ELECTRICAL SYSTEM
1. Engine
2. Engine stop function
3. Carburettor jet
4. Headlight
5. Cutting unit clutch
6. Battery 12 V, 20 Ah
F1. Fuse, 5 A
F2. Fuse, 15 A
G. Generator
K1. Relay
K2. Relay
K3. Starting relay
M. Starter motor
R1. Resistor
S1. Reset switch
S2. Changeover switch, manual/automatic
S3. Lights switch
S4. Switch, cutting unit
S5. Microswitch, grass collector full
S6. Microswitch, grass collector
S7. Microswitch underneath operator's seat
S8. Microswitch underneath clutch pedal
S9. Ignition switch
S10. Microswitch for transport mode
E
fig. 6
English – 37