Installation; Connector Interface; Valve Interface; Valve Calibration Objectives - Danfoss pved-cl Operation Manual

Operation Manual
PVED-CL Controller for Electro-Hydraulic Steering, Version 1.38

Installation

Installation

Valve Interface

© Danfoss | May 2016

Connector Interface

Two connector variants are available: Deutsch and AMP. Interchanging the Deutsch connectors will not
destroy the PVED-CL however the PVED-CL will not work.
CAN bus
Switch
sensors
CAN-L - 1
Vbat+ - 2
Vbat- - 3
CAN-H - 4
Uninterruptable
Grey connector
power source
The CAN-wiring is done according to J1939-15, where as Analogue wiring is recommended to be at least
0.75 mm2 and no longer than 9 meters.
W
Warning
The following wiring faults will destroy the PVED-CL '5V out' output:
•
Connecting GND to 5V out AND Vbat+ to Vbat-
•
Connecting Vbat+ to 5V out
•
Short-circuit 5V out to GND for more than 5 minutes
The PVED-CL shall always be calibrated to the valve it is controlling. Valve calibration enables interfacing
to various valve types as well as cancellation of mechanical, electrical and environmental dependent
tolerances which can lead to performance degradations. Valve calibration is normally only needed once
at production time, at installation time, in a PVED-CL replacement situation or in performance fine-tuning
situations.
The PVED-CL is calibrated to the valve by a dedicated valve transfer function, having 7 parameters to
compensate for discontinuities (hydraulic dead-band), asymmetry (maximum flow) and non-linearity in
the left and right spool characteristic. Correct parameter values are essential for achieving optimum
performance in all PVED-CL operation modes.

Valve calibration objectives

The PVED-CL calibration shall satisfy multiple conflicting objectives. Like for any proportional spool valve,
the purpose of the hydraulic dead-band is to prevent unwanted oil output flow while the main spool is
resting in neutral position.
In PVED-CL steering wheel mode (open-loop application), the dead-band prevents noise (electrical and
mechanically), from e.g. the steering wheel sensor (SASA), from leading to unwanted oil output flow or
creating small steady-state quivering wheel movements. On the other hand, a too large dead-band may
result in a noticeable steering wheel dead-band which may not be desirable.
Analog sensors
1 - AD1
2 - 5V out
3 - GND
4 - AD2
Black connector
P005 095E
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