T-code Valid from serial number
403-414, 669-671, 716-718 713962-
Date Order number
2005-06-01 218920-040
21- 40 Service Manual REFLEX RR B,E RR B,E CC © BT Europe AB
Electrical system – 5000
Functional description
21.4.7 Braking
The truck employs various braking systems:
Auto-brakes
When the driver releases the accelerator pedal, the drive motor auto-
matically brakes the truck to the desired speed. The auto-brake func-
tion and braking power can be set with parameters.
Motor brakes (electric)
When the driver changes direction using the lever, the drive motor func-
tions as a generator/brake and feeds current back to the battery. Brak-
ing force is determined by the accelerator pedal. The A5 electronic card
receives information from A1 that motor braking is under way and
changes regulation of A1.
Foot brake
When the driver depresses the brake pedal, potentiometer R2 is actu-
ated. The voltage rises from 1.7 V to 4.1 V, which gives a braking force
of 0-100%. Down to half of the pedal action, the truck is braked by
reversing the drive motor. If the truck has support arm brakes, they will
begin to brake the truck in the event of continued downward pressure
on the pedal. When the pedal is pressed down fully, this also activates
the parking brake. LED 801 shines progressively brighter as braking
power increases.
Parking brake
When the truck is standing still and the brake pedal is depressed, the
parking brake is activated.
If the driver leaves his seat for more than three seconds, A5 cuts the
current to Y1, causing the parking brake to be applied.
Designation Diode number
SUPPORT ARM BRAKE 801
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