MDS-E/EH Series Instruction Manual
5 Servo Adjustment
274
IB-1501229-F
5.3.3 Improving the Cutting Surface Precision
If the cutting surface precision or roundness is poor, these can be improved by increasing the speed loop gain (VGN1,
VIA) or by using the disturbance observer function.
< Examples of faults >
• The surface precision in the 45° direction of a taper or arc is poor.
• The load fluctuation during cutting is large, causing vibration or surface precision defects to occur.
(1) Adjusting the speed loop gain (VGN1)
If the speed loop gain is increased, the cutting surface precision will be improved but the machine will resonate
easily.
The final VGN1 setting should be approx. 70 to 80% of the maximum value where resonance does not occur.
(Refer to "Setting the speed loop gain")
(2) Adjusting the speed loop leading compensation (VIA)
The VIA has a large influence on the position trackability, particularly during high-speed cutting (generally F1000 or
more). Raising the setting value improves the position trackability, and the contour precision during high-speed
cutting can be improved. For high-speed high-precision cutting machines, adjust so that a value equal to or higher
than the standard value can be set.
When VIA is set lower than the standard value and set to a value differing between interpolation axes, the
roundness may worsen (the circle may distort). This is due to differences occurring in the position trackability
between interpolation axes. The distortion can be improved by matching the VIA with the smaller of the values. Note
that because the position trackability is not improved, the surface precision will not be improved.
(Refer to "Setting the speed loop lead compensation")
POINT
Adjust by raising the speed loop gain equivalently to improve cutting surface precision, even if the measures differ. In this
case, it is important how much the machine resonance can be controlled, so adjust making sufficient use of vibration
suppression functions.
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Summary of Contents for MDS-E
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Page 32: ...1 IB 1501229 F 1 Installation ...
Page 76: ...45 IB 1501229 F 2 Wiring and Connection ...
Page 132: ...101 IB 1501229 F 3 Safety Function ...
Page 142: ...111 IB 1501229 F 4 Setup ...
Page 277: ...MDS E EH Series Instruction Manual 4 Setup 246 IB 1501229 F ...
Page 278: ...247 IB 1501229 F 5 Servo Adjustment ...
Page 351: ...MDS E EH Series Instruction Manual 5 Servo Adjustment 320 IB 1501229 F ...
Page 352: ...321 IB 1501229 F 6 Spindle Adjustment ...
Page 404: ...373 IB 1501229 F 7 Troubleshooting ...
Page 455: ...MDS E EH Series Instruction Manual 7 Troubleshooting 424 IB 1501229 F ...
Page 456: ...425 IB 1501229 F 8 Maintenance ...
Page 475: ...MDS E EH Series Instruction Manual 8 Maintenance 444 IB 1501229 F ...
Page 476: ...445 IB 1501229 F 9 Power Backup System ...
Page 494: ...463 IB 1501229 F 10 Appx 1 Cable and Connector Assembly ...
Page 504: ...473 IB 1501229 F 11 Appx 2 D A Output Specifications for Drive Unit ...
Page 514: ...483 IB 1501229 F 12 Appx 3 Protection Function ...
Page 523: ...MDS E EH Series Instruction Manual 12 Appx 3 Protection Function 492 IB 1501229 F ...
Page 524: ...493 IB 1501229 F 13 Appx 4 Compliance to EC Directives ...
Page 528: ...497 IB 1501229 F 14 Appx 5 EMC Installation Guidelines ...
Page 540: ...509 IB 1501229 F 15 Appx 6 Higher Harmonic Suppression Measure Guidelines ...
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