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5 Spindle Adjustment
MITSUBISHI CNC
[3] Execute D/A output to Ch1 and Ch2, and perform synchronous tapping operations with the
operation pattern 2 above.
[4] Check the waveform and adjust the synchronous tapping time constant so that the margin for
current limit at acceleration/deceleration is 50% or more.
Output waveform example during synchronized tapping
(2) Accuracy test using synchronous tapping accuracy test tool
[1] Perform synchronous tapping operations using the time constant determined in (1) above.
[2] Check the synchronous tapping accuracy (for both operation pattern 1 and 2) by using the
synchronous tapping accuracy check tool.
[3] If the number of error pulse is 100 (p-p) or less, satisfactory accuracy is secured, and the check is
completed.
[4] If the number of error pulse exceeds 100, increase SP008 (VGN2) by 10 increments, and adjust so
that the error pulse is 100 or less. Note that the maximum setting value is 150 x [inertia ratio].
Output name
Output value
(Setting parameter: Value)
Magnification
(Setting parameter: Value)
CH1 Output Motor rotation speed SP125: 1 SP127: 50 (2000r/min/V)
CH2 Output q axis current command SP126: 2 SP128: 100 (100%/V)
0
0
Motor rotation speed
q axis
current
command
3000r/min
Current limit level
Current limit level
Margin for current limit at
acceleration has to be
50% or more.
Margin for current limit at
deceleration has to be 50% or more.
Error pulse display
Synchronous tapping accuracy test tool data sample