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On an ATV630, why does the drive ramp all the way to low speed and high speed when my +/- speeds are pulsed?

Issue:
On an ATV630, why does the drive ramp all the way to low speed and high speed when my +/- speeds are pulsed?

Product Line:
Altivar 630

Environment:
All

Cause:
Drive ramps all the way up and down without stopping in between 

Resolution:
This could be caused by any of the following:
  • The pulse isn't actually a pulse. Instead you're providing a sustained signal to the digital input 
  • Acceleration time is too short. +/- speed ramping is based on acceleration speed
  • The pulse doesn't drop out long enough for the drive to recognize that it has dropped. Repeated input activation at too high speed can cause this
Try the following:
  • Make sure you're actually pulsing the inputs for activation
  • Try pulsing the inputs with a jumper wire from +24V to see if the behavior changes
  • Adjust acceleration time longer
  • Adjust deactivation of the digital inputs to a longer amount of time so the drive realizes the input has deactivated. The drive needs to see the signal drop in order to stop ramping
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