Relays - Kubota KX080-4 Workshop Manual

KX080-4, WSM

(2) Relays

Current flows in the components of the AC system to
the blower motor and compressor's magnetic clutch. If all
of the current were supplied via the main switch, the
current would be too much for the switch, so the contacts
of the main switch would be in danger of burning out.
Similarly, if this current flowed directly from the battery
and the operator forget to turn the blower motor off, the
battery would discharge.
The system is equipped with relays in order to
prevent these kind of problems. When the current flows
through the coils of these relays, their contacts close,
allowing electricity to be supplied from the battery. By
adopting these relays, only a tiny amount of current is
needed to operate the relays, so very little current flows
through the main switch. As a result, the concern over its
contacts burning out is eliminated and when the main
switch is open, the relays' contacts open at the same
time. When this occurs, the flow of electricity in the AC
circuit ceases and the possibility of the battery
discharging is also eliminated.
(1) Relay Terminal 1
(2) Relay Terminal 2
(3) Relay Terminal 3
(5) Relay Terminal 5
5-M15
CABIN
(A) Connection Diagram
RY9212148CAM0007US0
KiSC issued 08, 2015 A