Can Interface; Bus Architecture Considerations; Power-Up; Can-Bus Sensor Power-Up Synchronization - Danfoss pved-cl Operation Manual

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

CAN Interface

12 | © Danfoss | May 2016

Bus Architecture Considerations

It is recommended to install the steering system on a separate bus as it is important to have enough CAN
bus bandwidth for all the input devices/controllers and the PVED-CL to work in an optimal way.

Power-up

Within 1500 ms after powering up, the PVED-CL is fully operational and transmits an Address claim
message on CAN-bus. Power-up is normally synchronized with engine start and allows to be executed
regardless any sensor input values. After power up the PVED-CL validates periodically the presence of all
CAN and analogue control signals with the ones mapped. In case a signal is not available or is invalid, the
PVED-CL enters fault-mode or optionally a reduced state, where operation is continued with reduced
steering functionality. After successful power-up, the main spool inside the valve is first operated when a
steering device is operated.

CAN-bus Sensor Power-up Synchronization

The PVED-CL can be configured to wait up to 10000 ms for a CAN message. This is to accommodate for
slow-starting CAN devices which are transmitting data to the PVED-CL.
Please see device dependent parameters HPStwPowerUpTimeout, HPStdPowerUpTimeout,
LPStdPowerUpTimeout, WAPowerUpTimeout and VSPowerUpTimeout in
107.

CAN-bus Protocol

The PVED-CL conforms to CAN-bus standard J1939. Relevant J1939 compliance issues are explained in
PVED-CL Communication Protocol, 11079551.
For details on parameter changes, refer to

PVED-CL Input Interface

The PVED-CL provides:
•
Two 0-to-5 V DC analogue inputs
•
One CAN J1939 2.0b compatible bus
The CAN interface combines compact design, reliability and flexibility to offer the steering functionality
required. Additionally the CAN interface is used for configuration and diagnostic purposes.
For correct signal acquisition, read the requirements described in Analogue Interface, page 28 and PVED-
CL Communication Protocol, 11079551.

Output Interface

The PVED:
•
Controls the physical movement of the main spool inside the valve
•
Controls the color of the LED
•
Transmits process data on CAN to help service personnel during installation and to verify the
Computational processed PVED-CL.

Battery

Likewise hydraulic power, sufficient electric power supply to the PVED-CL is crucial to operate the spool
inside the valve and to transport the control signals. Without it, the vehicle cannot be steered by the
PVED-CL. In order to cope with voltage fluctuations during cold engine start or disturbances by the
alternator, the PVED-CL incorporates a regulator to stabilize the voltage level used by the electronics and
Changing Default Parameters
11025583 | AQ00000216en-US0302
System Parameters on page
on page 16.