24 - Electrical System; Functional Description; Fuses And Circuit Breakers - Nilfisk-Advance Advance Liberty SC50 Series Service Manual

Service Manual – Liberty SC50 229

24 - Electrical System

Functional Description

The Liberty SC50 is predominantly a distributed network of intelligent controllers. The electrical system
describes those support aspects for the distributed controllers. This includes power and power control
components, as well as the electrical backbone of the machine, including the main schematics and wiring
harness diagrams.
The electrical system is 24-volt, and is powered by either two 12-volt or four 6-volt lead-acid batteries, or 1
to 6, 24-volt Li-Ion batteries.. The batteries are maintained with an onboard intelligent battery charger. The
electrical system also utilizes several relays, which are controlled by the controllers, but themselves control
power and/or enabling of the controllers.

Fuses and Circuit Breakers

The F1 fuse is the system's main fuse for protecting
against short circuit for all loads. For conventional lead-
F1 Fuse
acid batteries, the F1 fuse is mounted directly onto the
100A
positive main battery terminal. At this location, the fuse
protects all wiring within the machine as well as the
batteries themselves.
Battery
Charger Wire
Because Lithium-Ion batteries are internally
protected for short circuit and overload, the
F1 fuse doesn't need to be located right on
the battery pack. Instead, the F1 fuse is
F1 Fuse
located in the electrical bay above the power
100A
module.
In addition to the main fuse, there are three
resettable circuit breakers. CB1 (5A) protects
the positive power input to the Main Machine
Controller, including the first pole of the KSI
Power
realy. CB2 (5A) protects the second pole of
Module
the KSI relay, and everything downstream
making use of KSI. CB3 (15A) protects the
power input to the steering controller.
K3 Relay