GE IS215UCVDH1A Power module

Feed forward takes advantage of the fact that the SC900 DSP knows the frequency of the encoder or step inputs and knows how fast the motor should be going at any given instant. All or part of this velocity can be added to the velocity command to reduce following error. If KVFF is set to 100 (%), the steady state following error reduces to zero.

Overshoot 

Setting KVFF equal to 100% can result in position overshoot. Somewhat lower values may be required, if this is a problem. KVFF set to 70%-80% typically achieves the fastest step response with no overshoot. However, setting KVFF to less than 100% gives steady state following error when running at constant speed.

Brand display

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