Electrical system – 5000
General
Order number Date Valid from serial number T-code
226057-040 2005-09-23 914369- 675
© BT Europe AB Service Manual LWE130 12- 1
12- Electrical system – 5000
12.1 General
The electrical system of the truck is based on the SEM-X system.
• The main power source is a 24 V DC traction battery.
• The travel drive motor is a separate excitation type (SEM). The trav-
el drive motor is operated by a self-contained transistor regulator re-
lying on pulse width modulation (PWM) technology.
• The lift unit motor is a conventional DC motor without any external
field winding connections. Switch-on of the hydraulic unit's electric
motor is achieved using a contactor.
• A set of parameters used to adjust the truck’s performance and brak-
ing characteristics is stored in the transistor regulator. The regulator
also monitors error conditions that may occur.
12.1.1 Firmware (truck control software)
The current firmware version in the transistor regulator is V1.10.
The firmware stored in the transistor regulator cannot be updated or
changed.
12.2 Nomenclature
Items shown in square brackets [ ] refer to electrical component desig-
nations as stated in the electrical wiring diagrams. See section “12.3.1
Electric component overview” .
{high} refers to a voltage level that is approximately the same as the
supply voltage level.
{low} refers to a voltage level of approximately 0 Volt.
s/c = short circuit.
o/c = open circuit.
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