Power Steer Configuration - Sevcon Gen4 Applications Reference Manual

Power steer configuration

General
Power steering can be provided using:

Contactor. Map the power steer contactor drive object to an analogue output.

Pump motor controller. Configure pump to provide power steering. Power steer demand is
added to pump demand.

Dedicated motor controller. Map power steer application motor object to motor control slave.
NOTE: Power steer motors always run in speed mode. Ensure the motor slave is also
configured for speed mode in 6060

The power steer can be triggered by a number of events:

Vehicle moving

FS1 switch activating

Direction selected.

Seat switch activating

Footbrake activating
CAUTION: The power steering function will always attempt to execute, even if the line contactor
is open due to a fault condition. This is to ensure power steering continues to operate at all
times.
Set the power steer motor speed, acceleration and deceleration at 2B01
the power steer motor is operated by a contactor.
Variable Assist Power Steering
Gen4 supports a variable assist power steering algorithm which can be used to reduce the
power steering speed as vehicle traction speed increases to a user configurable level. Set the
reduction factor and traction speed in 2B02
vehicle speed increases to prevent steering becoming too light.
Doc. # 177/52701
Rev. 3.3
.
h
. This allows power steering effort to be reduced as
h
Configuration
. This is not required if
h
6-33