RUNNING GEAR OPERATION
Operating instructions • Semitrailer • 505369471-04 • 02/2019
45
CAUTION
Risk of accidents due to tipping move-
ments!
If there is an improper power interruption,
this may, among other things, result in the
valve switching states being unclear on
electronically controlled air suspension
systems. Unclear valve switching posi-
tions can result in tipping movements in
the longitudinal direction of the loading
surface on lift axle controls. These are es-
pecially dangerous when using a forklift to
load or unload from the rear.
► Properly shut down the entire elec-
tronic system before hitching and un-
hitching the trailer.
► Before disconnecting the supply lines
(compressed air, vehicle electronics
and ISO-7638 EBS power supply),
switch the ignition in the tractor to
"off" (terminal 15 = de-energised).
Optionally, KRONE trailers can also be fit-
ted with a system for electronically con-
trolled air suspension, e.g. via Wabco's
ECAS system. It electronically controls the
vehicle's ride height if there is a power sup-
ply and an adequate compressed air sup-
ply.
KRONE trailers with electronically con-
trolled air suspension can be optionally
equipped with various electronic control
devices (control box, SmartBoard, elec-
tronic buttons, etc.).
Fig. 5-26:
Example of a control box (Wabco)
If there is sufficient air and power supply,
the system can automatically regulate the
ramp height. If there is no power supply,
the ramp can also be adjusted via the elec-
tronically controlled air suspension with the
control lever on the control unit.
Also observe the enclosed supplier
documentation.
5.10
Lift axles
!
WARNING
Risk of accidents due to the raising
and lowering of the lift axle!
The lift axles are automatically raised de-
pending on the load state. If the tractor
unit's ignition is turned off, the raised lift
axles are lowered. There is an increased
risk of injury in the danger area of the
wheels.
► Instruct persons to leave the hazard
area of the wheels during loading and
unloading.
KRONE trailers can be equipped with an
electronic lift axle control with fully auto-
matic operation.
Fully automatic lifting of lift axles depend-
ing on the vehicle’s axle weight (air bellows
pressure) only takes place if the EBS plug
connection (ISO 7638) is active and the
vehicle speed is greater than 15 km/h for
the first time. When the ignition is interrup-
ted while the vehicle is at standstill, the lift
axle is lowered independent of the
vehicle's axle weight.
Manually overriding the fully-automatic
electronic lift axle control
Automatic control is cancelled if the lift axle
control is manually operated on the control
switch. The dependencies on the vehicle
axle weight and the vehicle speed are not
taken into account in this event. An EBS
plug connection is a precondition for this.
The control switch for manual lift axle con-
trol is on the control unit. Controlling a fur-
ther lift axle is done on the same control
switch on the fully-automatic and electronic
