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MDS-D-SVJ3/SPJ3 Series Instruction Manual
5-2 Adjustment procedures for each control
5-2-7 Spindle synchronization adjustment (For lathe system)
(1) Setting the gain, changeover rotation speed and time constant
[1] For speed loop gain during spindle synchronization, SP005 (speed loop gain 1), SP006 (speed loop
lead compensation 1), and SP007 (speed loop delay compensation 2) are used. For position loop
gain, set standard 15 to SP003 (position loop gain spindle synchronization).
(Note1) To change the setting value of SP003, set the synchronous and basic spindles to the
same value.
(Note2) For the adjustment of SP005, SP006 and SP007, conduct "5-2-2 Gain adjustment" as a
single unit beforehand.
[2] Set rotation speed and time constant during acceleration/deceleration figured by theoretical
calculations.
[3] Set D/A output as follows and output motor rotation speed and q axis current command.
(2) Confirming the current margin
Perform acceleration/deceleration up to the maximum current speed in spindle synchronization mode.
At this time, confirm that the current value for both acceleration side and deceleration side secure 30%
or more of margin in respect to the current limit value. Also, confirm that no oscillation, etc. are found in
the current waveforms.
(Note) If a margin is 30% or less, extend the acceleration/deceleration time constant so that the
margin is adjusted to 30% or more.
output waveform example in spindle synchronous mode
Parameter Setting value
SP003 15
SP036 0000
Ch1
output
Motor rotation speed SP125: 1 SP127: Set so that the maximum motor speed is displayed
Ch2
output
q axis current command SP126: 2 SP128: 100 (100%/V)
0
0
Motor rotation speed
Current limit at
re
g
eneration
Current limit at
accelaration
Current margin has to
be 30% or more.
Current margin has to be
30% or more.
q axis current
command
SP153 or SP185
SP152 or SP186