Configuring VSD-E/XE for velocity mode

From Granite Devices Knowledge Wiki
Jump to: navigation, search

Additional tips for VSD-E and VSD-XE in velocity mode.

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).

In no event the Product Information or parts hereof shall be regarded as guarantee of conditions or characteristics. The Product Information or any part thereof may also not be regarded as a warranty of any kind. No liability of any kind shall be assumed by Author with respect to Product Information or any use made by you thereof, nor shall Author indemnify you against or be liable for any third party claims with respect to such information or any use thereof.

As content of this Wiki may be edited by user community, Granite Devices Oy or it's affiliates do not take any responsibility of the contents of this Wiki. Use information at your own risk. However, Granite Devices staff attempts to review all changes made to this Wiki and keep information trustworthy.

Without written consent, Granite Devices' Products or Intellectual Property shall not be used in situations or installations where living beings, material property, or immaterial property could be harmed by the operation, features or failures of Product. Products may only be used in a way where hazards like moving parts, electric shock, laser radiation, or fire can't be realized even if the content of this Wiki would suggest otherwise.