© Danfoss | August 2018 AQ00000211 | 81
Changing parameters P3162, P3164, P3170 in the valve calibration sector can be done in two ways, depending on the
configuration tool capability and the access authority of the requestor.
1) Manual Valve Calibration Data sector modification
The valve calibration sector is modified by:
• Reading out the sector values
• Modifying the parameters subject to changes
• Calculate a new sector CRC
• Write the modified sector, sector CRC and signature CRC to the PVED-CLS
The PVED-CLS will apply the calibration values directly after re-start.
The advantage is that changes can be made to the sector without enforcing a subsequent auto-calibration procedure for
the change to take effect.
Important
This strategy requires using manual modification of the following parameters:
P3091 set to 0, P3093 set to 0 and P3095 set to 0, which are the default values.
2) Automatic Valve Calibration Data sector modification
In situations where it is not desired that the service tool shall read sector values and calculate new CRC values after
modification, the Automatic Valve Calibration sector modification can be employed.
To use this method the desired parameter changes to P3162, P3164 and P3170 in the valve calibration sector is
configured in the hydraulic configuration sector.
The PVED-CLS spool auto-calibration routine will copy P3091, P3093 and P3095 to P3162, P3164 and P3170,
respectively and calculate the Valve Calibration Data sector CRC.
The advantage is that a change to the valve calibration sector can be effectuated by updating the hydraulic configuration
sector with a pre-calculated sector CRC and signature CRC.
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