7
TEBS E
External systems
134
7.1.3 Battery supply and battery charging
Application
Vehicles with ECAS functionality via TEBS E
Purpose
ECAS functions upon ignition off or disconnected trailer.
Function
ECAS functions following activation of the battery supply
– Press the button < 5 seconds.
Switching the ECAS functions off
– Press the button > 5 seconds.
ECAS functions following ignition off / uncoupled trailer
The ECAS functions remain active for a time predefined by parameter, then
TEBS E switches off.
Extending the stand-by time: If the button is pressed again before the
stand-by time has elapsed, the time doubles. Multiple button presses
multiply the standby time (up to 10 times possible).
When the trailer is disconnected, TEBS E and ECAS valves are supplied by a bat-
tery connected to the system.
Battery supply: As long as no power supply is provided by the towing vehicle, the
above indicated functions can be supplied by a battery in the trailer. To prevent ex-
haustive discharge, the supply is switched off at a voltage below 22 V (24 V battery)
or 11 V (12 V battery).
Battery charge: The battery is charged from 2 - 10 Ah at up to 2.5 A via TEBS E
and ELEX, if ISO 7638 is plugged in. If a battery of greater capacity is already in
the trailer vehicle, e.g. for operating a cooling unit, then this can also be used for
the stand-by time. Charging this battery via TEBS E and ELEX is not permissible,
however, and must be deactivated by parameter.
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