Ndrive HP Options
Ndrive HP 10/20/30 User’s Manual
4-30 www.aerotech.com
Finding the Proper Commutation Offset in R/D Auto-Configuration Mode
The R/D Auto-Configuration mode assumes that the zero crossing of the R/D Converter
is aligned with the 0 angle of commutation on the Ndrive. Therefore, to determine the
commutation offset angle, perform the following steps:
The resolver absolute counter may be read in the Ndebug
utility via the command sequence: “DSPMEMREAD 2
0xEB0006” for channel 1, or 0xEB0007 for channel 2.
1.
Open the Nstat.exe utility.
2.
Select the tab, which displays the absolute resolver feedback register.
3.
Rotate the resolver until you have an approximate zero value on the feedback
register (note that this value will roll over at 65,535).
4.
Begin with an MSET value of 0 degrees, execute MSET commands with an
increasing angle until you see a value of 0 indicated for the absolute resolver
angle. This MSET angle is the desired commutation offset.
5.
Enter the value from step 4 into the CfgMotOffsetAng axis parameter. Note that
for negative values, you must add 360 degrees (valid parameter range is 0-360
degrees).
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