Power-Up; Can Bus Protocol; Dc Power Supply - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW
1.3

POWER-UP

During power-up the PVED-CLS will typically complete its boot sequence after ~1800ms. At this time an address claim
message will be issued on the CAN bus. Following the address claim the PVED-CLS will go into WAS calibration service
mode as default (provided that the PVED-CLS is setup with default parameters).
After the WAS has been calibrated and the PVED-CLS has been power-cycled, PVED-CLS will go into spool dead-band
calibration service mode.
When the spool dead-band calibration is performed and the PVED-CLS has been reset (power-cycle or software-reset)
, an initialization period of max 10 seconds is started, to allow all mapped sensors, MMI messages, WAS
messages/signal, SASA messages and Road switch signal to boot and appear on the CAN bus or input pins.
Once in operation mode the sensors and analogue signals are periodically validated and must remain present for the
PVED-CLS to remain in operation mode. The validation period is configurable for each signal. In case a mapped
message disappears from the CAN bus, analog signals are disconnected or signal crosschecks fails, the PVED-CLS will
enter safe state and remain non-operational until a reset is completed. Missing curvature commands are exceptions
and does not put PVED-CLS to safe state. A reset may be either a power cycle sequence or a soft reset CAN message.
1.4

CAN BUS PROTOCOL

The PVED-CLS conforms to CAN bus standard J1939. Access to reading and modifying configuration parameters are
provided through the KWP2000 protocol. Please see the Danfoss documents, PVED-CLS KWP2000 Protocol and
PVED-CLS communication Protocol.
1.5

DC POWER SUPPLY

The PVED-CLS is designed to operate reliably with both 12V and 24V battery voltage, as used on typical agricultural
vehicles. Internal voltage regulators allow fluctuations on supply voltage terminals from 5.5V to 35.5V, but the PVED-
CLS will sent out an INFO level DTC if the supply goes below 9V, but will not enter safe state. Below 9V the
electrohydraulic functions of an EHPS, EHI and OSPE cannot be guaranteed to work properly. In case the supply
voltage exceeds 35.5V, a DTC is issued on the CAN bus, and the PVED-CLS will enter safe state. If the power supply
goes below 5.5V the PVED-CLS will shut down.
Experience shows that excessively low supply voltage may occur during engine cranking in cold conditions,
depending on the state of battery charge, and/or general state of battery.