Linde 115 Series - Page 79

RP01 / Chapter 1
115 804 2401.0201
Page 1
Service Training
02.01
Section 6
6 ELECTRICAL CONTROL
CAUTION: It is imperative, that before working on the control system, that the battery is
disconnected, and the steering capacitor voltage is discharged.
The steering capacitor voltage can be safely discharged by operating the horn with the
battery plug DISCONNECTED. Check that the voltage between 3F1 and the main negative is less
than 5V before working on the truck.
Failure to carry out this procedure can lead to damage of the CAN interface drivers. Components
MUST NOT be removed or replaced with the truck live.
6.1 CONTROL SYSTEM FOR LDC TRACTION DRIVE UNIT
The reversing field separately excited (shunt wound) motor together with the 16kHz LDC controller
provides smooth precise control of drive and regenerative electric braking.
This motor configuration permits higher travel speeds to be maintained when laden as well as improved
performance on moderate gradients.
The computer based controller provides smooth automatic regenerative electrical braking when the
accelerator pedal is released and brings the truck to a complete stop. When the opposite direction is
selected whilst travelling the transition between directions is seamless with again all electrical braking
returning energy to the battery. Because regenerative electrical braking returns current at battery voltage
good levels of braking can be achieved for moderate motor currents. This ensures a cool running drive
motor, minimises use of the mechanical brakes and increases the work available per battery charge.
6.1.1 OPERATING PRINCIPLE
S2
X10
G1
(48V)
1F1
K1
1M1
1A1:2
1A1:1
2M1
7
54623
M
A1
A2
E2
E1
M
D2
A1
1A1
115_6-3
1B3
115_06-2
Series motor characteristics
Torque
Shunt motor characteristics
Speed