6
TEBS E
GIO functions
68
eTASC
eTASC combines the solenoid valve functions of electronically controlled air sus-
pension (ECAS) and the manual lever operation of a conventional air suspension
system with rotary slide valve (combination of TASC and ECAS solenoid valve).
The front and rear axles of drawbar trailers are controlled by using two eTASC de-
vices. Lateral control with two eTASC devices on semitrailers is not permitted.
The following functions described below are subject to power supply ISO 7638 and
‘ignition switched on’.
Lifting
By manually turning the lever counter-clockwise, the bellows are pressurized re-
sulting in raising the body of the vehicle. After lifting has stopped (stop position)
Trailer EBS E will detect the new nominal (current) level. This nominal level is set
to default until next time the operator changes it, - or until next time the ignition is
switched off, - or until vehicle starts driving again.
Lowering
By turning the lever clockwise, the bellows are de-pressurized and the body of the
vehicle will be lowered (venting through eTASC).
Device variant ’Dead-Man's Safety System’: After taking hand off the lever, it
automatically returns to the ’Stop’ position. Trailer EBS E will now recognise the
current level as the new nominal level. This nominal level is set to default until next
time operator change demand, - or until next time the ignition is switched off, - or
until vehicle starts driving again.
Device variant ’Lock in lowering’: If the lever is turned counter-clockwise until
lock position. After taking hand off the lever, it remains in ’Lowering’ position. As a
result the vehicle body will be lowered until reaching air bellow buffer level (internal
air bellow mechanical stop). Assuming the operator does not intervene, the lever
will only return to ’Stop’ automatically, when vehicle starting to drive, triggered by
Trailer EBS E sending signal to eTASC for return to normal ride level (Return to
Ride function).
Device variant ’Lock in lifting’: If the lever is turned clockwise until lock position.
After taking hand off (let go) the lever, it remains in ’Lifting’ position. As a result the
vehicle will be lifted until reaching the calibrated maximum height level. Without
power supply it is possible to start lifting the vehicle (turn lever clockwise until lock
position) until reaching mechanical stop (shock absorber max. stroke, suspension
stroke limitation cables, - or pneumatic air supply cut off through a height limitation
valve. At the start of driving, the lever automatically returns to ’Stop’ and Trailer
EBS E sending signal to eTASC for return to normal ride level (Return to Ride
function).
Behaviour with ignition off / Vehicle uncoupled
During ‘ignition off’ – or trailer uncoupled, all functions described above are oper-
ated in the same manner as with the ‘ignition turned on’. The system is working
purely mechanically controlled and no automatic adjustments will be performed by
eTASC (no electrical power supply) during loading or unloading.
RtR function is only available when the vehicle is power supplied via ISO 7638, and
subject to speed signal reading at Trailer EBS E. If power is supplied via ISO 1185
(24N), RtR will only be working for the duration of brake actuation (apply brake
pedal) during driving (speed signal must be recognized by Trailer EBS E).
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