12- 16
Service Manual
LWE130
© BT Europe AB
Electrical system – 5000
Functional description
T-code
Valid from serial number
Date
Order number
675
914369-
2005-09-23
226057-040
Event:
5. Traction, drive wheel first
Preceding event
3
Action(s)
Move butterfly [L1] in drive wheel drive direction.
Influencing
elements
Fuse [F1].
Travel in drive wheel direction switch[S16].
Speed control potentiometer[R1].
Battery charge level (can limit maximum speed).
Operation of fork lift (limits maximum speed when used while driving).
Resulting
conditions
input [A1:DRIVE STEERED WHEEL DIRECTION] goes {high}.
R1 supplies a d.c. voltage to input [A1:INP.WIPER DRIVE POT] (0 to 4,7V)
[A1:OUT. NEG. MAGNETIC BRAKE] goes {low}.
Brake coil [Y1] energises, mechanical brake releases.
Current fed to traction motor field winding (F1 -ve and F2 +ve).
Pulsed current fed to traction motor armature proportional to butterfly
deflection.
Event:
6. Neutral braking
Preceding event
4 or 5
Action(s)
Let butterfly [L1] return to neutral position while truck is in motion.
Influencing
elements
Parameter settings [RELEASE BRAKING].
Resulting
conditions
Traction motor [M1] acts as generator and via transistor regulator [A1] con-
verts the truck’s energy of motion into electrical energy thus reducing the
truck’s speed. The braking intensity is dependant on a parameter setting.
The mechanical brake [Y1] activates after the truck comes to a complete
stand still. Input [A1:OUT. NEG. MAGNETIC BRAKE] goes {high}.
Event:
7. Reverse braking
Preceding event
4 or 5
Action(s)
Move butterfly [L1] to opposite travel direction.
Influencing
elements
Parameter settings [INVERSION BRAKING].
Resulting
conditions
Traction motor [M1] acts as generator and via transistor regulator [A1] con-
verts the truck’s energy of motion into electrical energy thus reducing the
truck’s speed. The braking effect increases the more the butterfly is
deflected. The mechanical brake [Y1] activates after the truck comes to a
complete stand still. Input [A1:OUT. NEG. MAGNETIC BRAKE] goes {high}.
Table 6: Theory of operation
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