TEBS E
6
GIO functions
75
6.4 Speed switch (ISS 1 and ISS 2) and RTR
Vehicle type
All trailer vehicles
Purpose
The two integrated speed switches, ISS 1 and ISS 2, can be used for independent
control of two functions in the trailer.
The RTR (Return to Ride) application is used to automatically move the vehicle
with air suspension to ride height after starting to drive.
Function
The switching state of the output changes when the vehicle speed exceeds or
drops below a limit speed set in the parameters. This allows solenoid valves to be
switched on or off depending on the speed.
A typical example of application is the simple locking of steering axles, see chap-
ter 6.23 ‘Steering axle lock’, page 113. T
he two threshold speeds at which the out-
put's switching state changes can be set in the parameters anywhere between 0
and 120 km/h. A minimum switching hysteresis of 2 km/h must be observed.
The gate output is switched off below the threshold speed set in the parameters.
When the threshold is reached, the output is switched on and a supply voltage is
applied. Parameters can also be used to invert the switching function so that sup-
ply voltage is applied in free position.
In the event of a fault it must be ensured that the appliance controlled by the switch
output does not remain in a state that will impair driving safety.
In the event of a power supply failure, for instance, a steering axle should be
locked as this represents a safe state.
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