Troubleshooting Typical Faults - Danfoss PVED-CLS User Manual

ENGINEERING TOMORROW

15.2 TROUBLESHOOTING TYPICAL FAULTS

Symptom PVED-CLS
operational status
No actuation (neither Operational
by AUX-steering and
auto-guidance-
steering)
Fault
No status available
Opposite actuation Operational
Slow actuation Operational
responds (delays)
Snake-movement or Operational
shaky-movement in
auto-guidance mode
Actuation with low Operational
gain (less flow than
expected)
Fault
PVED-CLS does not Fault
enter normal
operation and stays
in bootloader after
software download
Cause/solution
1. No or insufficient pressure is supplied to the valve.
2. No Auto-guidance controller or AUX-steering device is mapped
3. Flow/angle limited parameters set to ~0
4. No or incorrect auto-steering message from external set-point controller
5. System is in road mode
1. Any missing or incorrect input signal/message + wrong parameterization from
steering sensors/switches at the AD1, AD2, AD3 or CAN interface.
2. Insufficient electrical power supply to the PVED-CLS
3. Connector or wiring harness problem
4. Missing wheel angle- or valve calibration
1. CAN bus not operational. Check connection.
2. No electric power supply
3. Check CAN message addresses
4. PVED-CLS is damaged. (see 5.2)
1. Hoses between valve and steering actuator are swapped
2. Parameter; Invert Flow Direction; (P3080), is set to 255 and PVED-CLS is mounted on a
OSPE/EHI or P3080 is set to 0 and PVED-CLS is mounted on a EHPS
1. Air is trapped in the steering actuator or hoses.
2. Oil has high viscosity. Make sure to apply to the technical requirements listed in the
Danfoss document OSPE Steering valve, SASA sensor, Technical information
3. The requested pressure is supplied with some delay (Pump).
1. Shaky-movement: The Open loop dead-band parameters P1 and/or P2 (P1:
P3166 + P3170; P2: P3168 + P3170) is set too aggressive (in flow range) or the
Closed loop dead-band edge, Left/Right (P3166 and P3168) are set too
conservative (inside hydraulic dead-band)
2. Snake-movement: The Open loop dead-band parameters P1 and/or P2 (P1:
P3166 + P3170; P2: P3168 + P3170) is set too conservative (inside hydraulic
dead-band) or the Closed loop dead-band edge, Left/Right (P3166 and P3168)
are set too aggressive (in flow range)
1. The offset dead-band CL parameter (P3170) is set too low (inside dead-band) or the
left/right dead-band OL parameters (P3166 and P3168) are set too low (inside dead-
band).
2. The parameters for setting up a steering wheel program (P3522 to P3561) are set too
high
3. Parameter; OSP displacement (P3084) is set greater than the true displacement of the
OSP
4. Parameter Valve capacity (P3088) is set greater than the true flow capacity of the
valve
5. Parameters Max Spool Position Let/Right (P3162/P3164) is set too low
6. The soft-stop functionality limits the flow due to wrong settings (P3564 and P3566)
1. The hydraulic back-up system is active. The steering sensitivity is determined by the
OSP.
1. Wrong software downloaded to one of the microcontrollers inside PVED-CLS. Make
sure the correct software is downloaded to the correct controller
Table 54