AB2005 Posted July 28, 2011 Report Share Posted July 28, 2011 I recently commissioned a Danfoss inverter VLT-5000 (open loop control) which is connected with a 30KW flywheel connected motor in a die cut machine. Problem which I facing that when we increase/decrease the speed (hard contact to drive SP UP/DN terminals), the speed increases/decreases very slowly while I set the ramp up and dn time just only 2sec. Can anyone help me out how to resolve that problem? "Don't assume any thing, always check/ask and clear yourself". Link to comment Share on other sites More sharing options...
marke Posted July 28, 2011 Report Share Posted July 28, 2011 Hello AB2005 It sounds as though you are using the "motorised pot" option.In this mode, you normally have a response time as well as the ramp up and ramp down time.I do not have a manual at home with me, but I will try to find the time to look it up later today.The other issue can be that if you try to accelerate too fast and the inertia is high, the drive can over-ride your acceleration settings if it is going into a current/torque limit. Best regards,Mark. Mark Empson | administratorSkype Contact = markempson | phone +64 274 363 067LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters Link to comment Share on other sites More sharing options...
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