3-8 BA 357-00 * 3.0 * 35700_03_Einleitung.fm
3 Introduction
Electrical system
The machine is operated electrically. The electric current is supplied by an
80 V-battery as direct current. A frequency converter converts the direct
current in 3-phase alternating current for the electric motors. The
electric traveling drive has an operating voltage of 48 volts, the electrical
drive of the hydraulic systems as an operating voltage of 43 volts.
The power electronics is the central control component. All the basic
functions (machine computer, backup computer, drive control, I/O
interface) are integrated into the power electronics that are required for
the operation of the machine. In addition, the power electronics are
equipped with a power supply.
The StVZO module is an additional component. The StVZO module
contains all the functions (control, DC/DC voltage transformer, I/O
interface) needed for implementing StVZO requirements.
To protect the HV system, optional equipment for monitoring the insulation
is installed in the machine. The insulation monitor enables you to discover
insulation faults during machine operation.
To protect the battery, a discharge monitory is installed in the machine.
The discharge monitor reduces performance hydraulic motor in
dependence on the battery charging level, thereby preventing a deep
discharge of the battery– see chapter 4 “Indicator display – battery charge
condition” on page 4-36.
The battery has to be connected to a specific charger at regular intervals
for recharging.
The exterior lighting of the machine has a voltage of 24 volts, the electrical
system of the machine has a voltage of 12 volts. Voltage converters
convert the 80-volt operating voltage into 24 volts for the
lighting or 12 volts for the electrical system.
Consumers and their supply circuits are protected with fuses.
The traveling drive, work hydraulics and steering system
should be disconnected using the motor isolating switch
– see chapter 4 “Motor isolating switch” on page 4-22.
The power electronics are not switched off circuit via the motor isolating
switch. In order to switch the vehicle off circuit, the battery connector must
be disconnected from the vehicle connection
– see chapter 4 “Battery connector” on page 4-20.
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