DAF CF65/75/85 FAG

31 FAG
A distinction can be made between three
different situations:
- rest position (normal position when
driving).
- venting steered leading rear axle
(increase pressure on driving axle).
- ventilating steered leading rear axle
(return to rest).
Operation of traction control mode is limited to
a maximum time: 90 seconds.
Traction control mode can only be operated
again after a pause of 50 seconds.
By now adjusting a time relay (G095) to a
delay time of 60 8 seconds, the pause
period is fulfilled.
REST POSITION
When the traction control mode switch C882
is operated (connection between contacts 5 -
1), a voltage is applied to connection point 15
of time relay G095 through fuse E062, wire
1221, contacts 5-3 of C883 and wire 4563.
During normal driving, the traction control
mode switch contact (C709) is open. The
switch is spring-loaded.
VENTING STEERED LEADING REAR AXLE
Pressing and then releasing the traction
control mode switch activates the traction
control mode (vents steered leading rear
axle).
The time relay (G095) is now switched on for
a period of 60 seconds. Contacts 30 - 87 are
closed.
Voltage is now applied from the VIC to
connection point 1 of BV084. The VIC will only
supply a voltage below the programmed
speed. This energises the solenoid valve
(B084), venting the bellows of the steered
leading rear axle. As a result a greater load is
placed on the driving axle (more traction).
When the 60 8 seconds have elapsed, the
connection 30 - 87 of time relay G095 is
broken. As a result, the voltage on valve B084
is also lost.
There is a safety mechanism to prevent
overload of the axle. The proximity switch
(E542) monitors the axle load.
When the maximum value is reached, the
proximity switch (E542) is activated and a
supply voltage is applied to connection point 1
of relay G427.
Relay G427 is now energised thereby
breaking contacts 3 - 4. The air-vent valve
(B084) is no longer activated, so that it is no
longer vented, but is immediately ventilated.

К оглавлению...