Difference between revisions of "Configuring VSD-E/XE for velocity mode"
From Granite Devices Knowledge Wiki
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(Created page with "Additional tips for VSD-E and VSD-XE in velocity mode. ==When to use velocity mode== * If speed control only is needed (such as spindle, feeders etc) * If position loop is...") |
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* If speed control only is needed (such as spindle, feeders etc) | * If speed control only is needed (such as spindle, feeders etc) | ||
* If position loop is closed externally (such as EMC2 [[Controller]]) | * If position loop is closed externally (such as EMC2 [[Controller]]) | ||
| − | ==How to interface with controller== | + | ==How to interface with [[controller]]== |
Suitable [[Reference signal|reference signal]] types to be used with velocity control: | Suitable [[Reference signal|reference signal]] types to be used with velocity control: | ||
*[[PWM]], gives high accuracy, low offset and low noise | *[[PWM]], gives high accuracy, low offset and low noise | ||
*[[Analog reference]], easy to interface but comes with some noise and offset (drifting at 0V signal) | *[[Analog reference]], easy to interface but comes with some noise and offset (drifting at 0V signal) | ||
*[[Pulse and direction]] train. Pulse frequency will determine the speed. | *[[Pulse and direction]] train. Pulse frequency will determine the speed. | ||
| + | |||
==Tips for tuning VSD drive for velocity control== | ==Tips for tuning VSD drive for velocity control== | ||
Useful [[GDtool]] settings: | Useful [[GDtool]] settings: | ||
*Choose None/Indexer as input source during tuning (so no drifting occurs during tuning). | *Choose None/Indexer as input source during tuning (so no drifting occurs during tuning). | ||
| − | *Check that you have chosen correct encoder resolution and Trajectory planner settings have realistic | + | *Check that you have chosen correct encoder resolution and Trajectory planner settings have realistic velocity limit setting. I.e. if you set limit to 2000 rpm, then +10V input will turn motor 2000 rpm and -10V turns 2000 rpm in another direction. |
*Check that Trajectory planner multiplier and divider settings have equal values (i.e. 50:50) to get behavior described above | *Check that Trajectory planner multiplier and divider settings have equal values (i.e. 50:50) to get behavior described above | ||
*If motor has limited travel and axis reaches end of travel during tuning, just use negative value in "Step response amplitude" spinbox to reverse direction. | *If motor has limited travel and axis reaches end of travel during tuning, just use negative value in "Step response amplitude" spinbox to reverse direction. | ||
| − | ===Adjusting offset in analog input | + | ===Adjusting offset in PWM and analog input modes=== |
''PWM/Analog offset'' parameter helps to zero the offset & drifting present in PWM and analog input reference modes. | ''PWM/Analog offset'' parameter helps to zero the offset & drifting present in PWM and analog input reference modes. | ||
In GDtool 2.5.1 there is a bug that prevents adjusting "PWM/Analog offset" spinbox whenever analog has been selected from drop down box. To workaround this, temporarily choose PWM from drop box and adjust the offset value. After value changed, switch back to "Analog in" mode. Press ''Set'' after offset value is changed and mode is set back to Analog in (no need to press during adjustment). | In GDtool 2.5.1 there is a bug that prevents adjusting "PWM/Analog offset" spinbox whenever analog has been selected from drop down box. To workaround this, temporarily choose PWM from drop box and adjust the offset value. After value changed, switch back to "Analog in" mode. Press ''Set'' after offset value is changed and mode is set back to Analog in (no need to press during adjustment). | ||
| − | [[Category:VSD-E/XE | + | [[Category:VSD-E/XE user guide]] |
| − | + | ||
Latest revision as of 21:58, 9 August 2013
Additional tips for VSD-E and VSD-XE in velocity mode.
Contents
When to use velocity mode[edit | edit source]
- If speed control only is needed (such as spindle, feeders etc)
- If position loop is closed externally (such as EMC2 Controller)
How to interface with controller[edit | edit source]
Suitable reference signal types to be used with velocity control:
- PWM, gives high accuracy, low offset and low noise
- Analog reference, easy to interface but comes with some noise and offset (drifting at 0V signal)
- Pulse and direction train. Pulse frequency will determine the speed.
Tips for tuning VSD drive for velocity control[edit | edit source]
Useful GDtool settings:
- Choose None/Indexer as input source during tuning (so no drifting occurs during tuning).
- Check that you have chosen correct encoder resolution and Trajectory planner settings have realistic velocity limit setting. I.e. if you set limit to 2000 rpm, then +10V input will turn motor 2000 rpm and -10V turns 2000 rpm in another direction.
- Check that Trajectory planner multiplier and divider settings have equal values (i.e. 50:50) to get behavior described above
- If motor has limited travel and axis reaches end of travel during tuning, just use negative value in "Step response amplitude" spinbox to reverse direction.
Adjusting offset in PWM and analog input modes[edit | edit source]
PWM/Analog offset parameter helps to zero the offset & drifting present in PWM and analog input reference modes.
In GDtool 2.5.1 there is a bug that prevents adjusting "PWM/Analog offset" spinbox whenever analog has been selected from drop down box. To workaround this, temporarily choose PWM from drop box and adjust the offset value. After value changed, switch back to "Analog in" mode. Press Set after offset value is changed and mode is set back to Analog in (no need to press during adjustment).
