Electrical system – 5000
Functional description
Order number Date Valid from serial number T-code
226057-040 2005-09-23 914369- 675
© BT Europe AB Service Manual LWE130 12- 15
Event: 2. Switch-on
Preceding event
1
Action(s)
Turn key switch [S17].
Influencing
elements
Input [A1:INP 24VDC KEY SWITCH] {high}.
Tiller switch not activated [S10], Input [A1:INP TILLER SWITCH] {low}.
Lift / lower switches not activated [S34, S41], Inputs [A1:INP.LIFT] &
[A1:INP.LOWER] {low}.
[L1] in neutral position.
Resulting
conditions
Battery status indication [H81] lights for 2 seconds then extinguishes. This
indicates battery charge level > 60%.
Main contactor [K10] remains open [A1:OUT.NEG.MAIN CONTACTOR]
{high}
Mechanical brake remains on [Y1, A1:OUT.NGATIVE MAGNETIC BRAKE]
{high}
Truck is ready for operation.
Event: 3. Tiller handle lowered for driving
Preceding event
2
Action(s)
Lower tiller handle.
Influencing
elements
Tiller switch [S10].
Main contactor [K10].
Secondary interlock [S171].
Resulting
conditions
Tiller switch [S10] activated.
Input [A1:INP TILLER SWITCH] is {high}.
Output [A1:OUT.NEG MAIN CONTACTOR] goes {low}.
Main contactor closes [K10] & auxiliary switch [S171] closes.
Event: 4. Traction, forks first
Preceding event
3
Action(s)
Move butterfly [L1]in forks drive direction.
Influencing
elements
Fuse [F1]
Travel in forks direction switch [S15]
Speed control potentiometer [R1]
Battery charge level (can limit maximum speed)
Operation of fork lift / lower (limits maximum speed when used while driv-
ing)
Resulting
conditions
input [A1:DRIVE FORK 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
Table 6: Theory of operation
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