Danfoss PVED-CLS Startup Manual page 39

Application Guide
PVED-CLS startup guide
Parameter setting
Parameter Conditions for value change
P3797 Set max value of captured Closed Loop Dead-Band edges [x10ʮm]
P3799 Set min value of captured Closed Loop Dead-Band edges [x10ʮm]
P3801 Time [sec] after turning the steering wheel before calibration can no longer be activated
P3802 Initial spool set-point [x10ʮm] for calibration routine
P3804 Angle [0.1 deg] on both sides of neutral that wheels move through while being timed (see figure below)
P3806 Upper time limit [0.1 sec] for wheels to move through angle specified in P3804
P3808 Upper time limit [0.1 sec] for wheels to move through angle specified in P3804
P3810 Number of attempted spool set-points attempts kept in memory
P3811 Minimum number of spool set-point attempts that must match in memory to complete calibration
© Danfoss | October 2018
PVED-CLS auto calibration— spool dead-band tuning advice
1. During machine startup, use default Auto Spool Calibration parameters as described in the calibration
section.
2. Manually adjust closed loop dead-band edges while tuning GPS steering.
3. Change Auto Spool Calibration parameters to achieve similar closed loop dead-band edges under
end-of-line conditions.
4. Iterate on parameters until the Auto Spool Calibration can consistently achieve good GPS steering
performance from end-of-line calibration.
The main parameters of interest are P3806 and P3808 which define the time limits for the wheels to
turn through the turn range sweep set in P3804 (5 degrees by default). By increasing or decreasing
the times, the closed loop dead-band edges will be smaller or larger (absolute value) respectively. By
decreasing the gap between the values, the captured dead-band edges will be more consistent from
machine to machine.
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