Diagnostics And Troubleshooting; Diagnostics - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW

Diagnostics and troubleshooting

15.1

DIAGNOSTICS

All detected faults, except faults with severity level INFO, will bring the PVED-CLS in to its safe state. Going into safe
state infers that the SVB and cut-off valve is de-energized. Any fault that brings the PVED-CLS in safe state are stored
in the PVED-CLS' error buffer for diagnostic purposes. The Danfoss Plus+1 Service Tool can be used to read out the
error-history or send DM2.
The PVED-CLS may be accessed via CAN for diagnostic purposes while being in safe state but parameter configuration
is not possible in safe state. Parameter configuration is only possible in "bootloader-mode"!
If the fault is related to the sensors or CAN bus cable tree, these faults should be resolved and the PVED-CLS should be
powered up again. If the fault requires parameters to be changed, the PVED-CLS must brought into "bootloader- mode"
before re-configuring the parameters.
Example on resolving a fault
A redundant wheel angle sensor is mapped as present (i.e. P3245 is set to 255) but does not exist in the system. The
PVED-CLS will boot, but go directly to safe state during safety checks, due to the missing wheel angle sensor.
Solution
The PVED-CLS needs to run in "bootloader-mode" before any parameter may be changed i.e. power up the PVED-CLS
in "bootloader-mode" (see the Danfoss document, PVED-CLS KWP2000 protocol) and set the parameter P3245 to 0
(i.e. redundant WAS not present) or mount a redundant sensor in the system and reboot the PVED-CLS.
The PVED-CLS software performs diagnostic checks on the CAN bus interface, analogue sensors, SVB interface,
internal hardware peripherals and software execution plausibility. All detected faults, except faults with severity level
INFO, will bring the PVED-CLS in to its safe state. Secondly, the diagnostic checks provide precise indication of the
fault source and thus reduce system down-time.
However, not all unexpected system behavior can be traced via error codes. E.g. a too low gain-related parameter value
may result in too slow steering actuation but this cannot be detected as a fault. To rule out faults resulting from
conflicting system and parameter settings, the following trouble shooting steps are recommended:
•
Check the list of typical faults first (see paragraph 15.2)
•
Check the J1939 Diagnostic interface
•
Check the PVED-CLS LED diagnostic interface (see paragraph 5.2)
136 | © Danfoss | August 2018 AQ00000211