Mitsubishi Electric MDS-E Series Instruction Manual page 288

MDS-E/EH Series Instruction Manual
5 Servo Adjustment
50.0
0.0
-50.0
-50.0
(F=3000mm/min , ERROR=5.0μm/div)
During SHG control, PGN1, PGN2 and SHGC are set with the following ratio.
PGN1 : PGN2 : SHGC = 1 : 8/3 : 6
During SHG control even if the PGN1 setting value is the same, the actual position loop gain will be higher, so the
speed loop must have a sufficient response. If the speed loop response is low, vibration or overshooting could occur
during acceleration/deceleration in the same manner as conventional control. If the speed loop gain has been
lowered because machine resonance occurs, lower the position loop gain and adjust.
No. Abbrev. Parameter name
SV003 PGN1
Position loop gain 1
(SV049) (PGN1sp)
SV004 PGN2
Position loop gain 2
(SV050) (PGN2sp)
SV057 SHGC
SHG control gain
(SV058) (SHGCsp)
【#2208】 SV008 VIA Speed loop lead compensation
Set the gain of the speed loop integral control.
Standard setting: 1364
Standard setting in the SHG control: 1900
Adjust the value by increasing/decreasing this by about 100 at a time.
Raise this value to improve contour tracking accuracy in high-speed cutting.
Lower this value when the position droop does not stabilize (when the vibration of 10 to 20Hz
occurs).
---Setting range---
1 to 9999
【#2215】 SV015 FFC Acceleration rate feed forward gain
When a relative error in synchronous control is too large, set this parameter to the axis that is
delaying.
The standard setting is "0". The standard setting in the SHG control is "100".
To adjust a relative error in acceleration/deceleration, increase the value by 50 at a time.
---Setting range---
0 to 999 (%)
[1] : Commanded path
[2] : SHG control (PGN1=47)
[3] : Conventional control (PGN1=33)
0.0 50.0
Shape error characteristics
Setting
Setting example
ratio
1 21 27 33
8/3 56 72 88
6 126 162 198 234
257
<Effect>
Control
Roundness error ( m)
method
Conventional
22.5
control
SHG control
2.5
Explanation
39 48
Always set with a combination
104 128
of these three parameters.
288
Setting
range
1 to 200
(rad/s)
0 to 999
(rad/s)
0 to 1200
(rad/s)
IB-1501229-F