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4 Servo Adjustment
MITSUBISHI CNC
【#2286】 SV086 LMCc Lost motion compensation 3 viscous coefficient
Set the machine system's viscous coefficient when using lost motion compensation type 3.
When not using, set to "0".
---Setting range---
0 to 32767 (0.01%/μm)
【#2313】 SV113 SSF8 Servo function 8
bit 7 : nmerc Machine error compensation amount
When disabled, the machine error compensation amount including backlash and pitch error to be
compensated by an NC will be ignored by the servo control.
Use this to adjust the lost motion compensation by the electric end roundness measurement.
0: Normal setting 1:Disable
(3) Setting and adjusting LMC compensation type 4
LMC compensation type 4 is enabled by being used with LMC compensation type 3. Make sure to
adjust the LMC compensation type 3 before setting the LMC compensation type 4.
<Adjustment method>
[1] Set about 5-fold SV016 setting value in SV091. (Set about 10% of machine friction.)
[2] Increase SV0091 in increments of about 20%, and confirm the limit value where vibration does not
occur. Note that the limit value is about 500.
[3] Set 50% of the limit value.
【#2291】 SV091 LMC4G Lost motion compensation 4 gain
Use this with LMC compensation type 3. As the delay in path tracking is monitored and
compensated, the delay in path tracking will be minimized even if machine friction amount changes
by aging. Use the lost motion compensation amount (SV016) * 5 (10% of the dynamic friction torque)
as the target. The higher the setting value is, the more accurate the quadrant change be; however,
the more likely vibrations occur.
---Setting range---
0 to 20000 (Stall current 0.01%)