Mitsubishi MELDAS MDS-C1 Instruction Manual page 238

(4) Adjusting the parameters
Adjust the following parameters while measuring the synchronous error between the servo and
spindle. The servo axis speed loop gain is valid for all control, so adjust the speed loop gain only
on the spindle side. Adjust mainly the lost motion compensation parameters on the servo side.
When these have already been adjusted when measuring the roundness, etc., they do not need to
be adjusted again. If the acceleration/deceleration is delayed for one of the axes, set the
acceleration feed forward gain for the delayed axis to compensate the synchronous delay.
No. Abbr. Parameter name
Synchronized tapping
SP194 VGTP* speed loop gain
proportional term
Synchronized tapping
SP195 VGTI* speed loop gain integral
term
Synchronized tapping
SP200 FFCI* acceleration feed forward
gain (gear 1)
SP201 FFC2* (Gear 2)
SP202 FFC3* (Gear 3)
SP203 FFC4* (Gear 4)
No. Abbr. Parameter name
SV027 SSF1 Servo function selection
1
Lost motion
SV016 LMC1
compensation 1
Lost motion
SV041 LMC2
compensation 2
Acceleration rate feed
SV015 FFC
forward gain
POINT
CAUTION
5. Spindle Adjustment
Spindle adjustment parameters
Set the speed loop proportional gain in synchronized
tapping mode.
Set the speed loop integral gain in synchronized tapping
mode.
Set the acceleration feed forward gain for selection of
gear 000 during synchronized tapping.
This parameter should be used when an error of relative
position to Z-axis servo is large.
Servo adjustment parameters
F E D
aflt zrn2
bit
Set the compensation amount with SV016 (LMC1) and SV041 (LMC2).
8
lmc 00: Lost motion compensation stop
9
01: Lost motion compensation type 1
Set the compensation amount based on the stall (rated) current of the
motor.
The standard setting is double of the friction torque. Setting to "0"
means the compensation amount is zero.
Set this with SV016 (LMC1) only when you wish to set the lost motion
compensation amount to be different depending on the command
directions.
Normally, set to "0".
When a relative error in the synchronous control is large, apply this
parameter to the axis that is delaying. The standard setting value is
"0". For the SHG control, set to "100".
To adjust a relative error in acceleration/deceleration, increase the
value by 50 to 100 at a time.
1. Stop the machine error compensation function (backlash compensation,
pitch error compensation, etc.) when measuring the synchronous error.
2. The servo's speed loop gain has an effect on all control, so do not adjust it
for synchronous tap. The spindle parameters are dedicated for synchronous
tap control, so improve the synchronization accuracy by adjusting the spindle
parameters when possible.
The above spindle parameters adjusted when adjusting the synchronous tap
are all validated when the NC power is turned ON again.
Details
Details
C B A 9 8
afse ovs lmc omr zrn3
Meaning when set to 0
5 - 28
Setting range Standard
0 to 1000
0 to 1000
0 to 1000
(%)
Setting range
7 6 5 4 3 2
vfct upc
Meaning when set to 1
10: Lost motion compensation type 2
11: Setting prohibited
(Stall [rated]
current %)
(Stall [rated]
current %)
63
60
0
0
0
0
1 0
vcnt
-1 to 200
-1 to 200
0 to 999
(%)