MDS-E/EH Series Instruction Manual
5 Servo Adjustment
278
IB-1501229-F
< Acceleration feed forward >
Vibration may occur at 10 to 20 Hz during acceleration/deceleration when a short time constant of 30 ms or less is
applied, and a position loop gain (PGN1) higher than the general standard value or SHG control is used. This is
because the torque is insufficient when starting or when starting deceleration, and can be resolved by setting the
acceleration rate feed forward gain (SV015: FFC). This is also effective in reducing the peak current (torque).
While measuring the current command waveform, increase FFC by 50 to 100 at a time and set the value where
vibration does not occur.
Acceleration rate feed forward gain means that the speed loop gain during acceleration/deceleration is raised
equivalently. Thus, the torque (current command) required during acceleration/deceleration starts sooner. The
synchronization precision will improve if the FFC of the delayed side axis is raised between axes for which high-
precision synchronous control (such as synchronous tapping control and superimposition control).
【
#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 (%)
POINT
Overshooting occurs easily when a value above the standard value is set during SHG control.
Current
command
(%)
200
100
0
100
80
60
40
20
0
Time (ms)
200
100
0
100
80
60
40
20
0
Time (ms)
No FFC setting
With FFC setting
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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