Motor on PF755 vibrates at standstill

taylor1982

Member
T
Join Date
Aug 2011
Location
Bavaria
Posts
78
Hi all,

I have a 100hp torque motor running on a Powerflex 755 drive. The motor is coupled to a drum which is accellerated and decellerated.

The problem now is, that the drum start to vibrate when the drive is enabled and get set speed = 0. This happens not every time and when you turn the drum manually just a bit then the vibrate is gone.

Has anybody hints what could avoid this vibrations? I did the Autotune with the drive an all other functions are fine.

Thank you
Steve
 
cjd1965 said:
Do you still have run 'run' high when command is 0 ?
Click to expand...

Yes, actually the run is always high and i just manipulate the reference speed. Of course a FALSE on run would help but are there any solutions that would avoid the vibrations even when drive is in control mode?
 
Is the control 4 to 20 mA or 0 to 10V etc ?


There maybe tiny variation in plc signal or noise like emc causing the drive to pick up a speed reference. Does the vibration go away if you disconnect the speed reference
 
Been a while since I worked with this drive. If I recall correctly you could use the Sleep/Wake parameters [351-355] to limit movement until a minimum reference level [Volts or Current] is reached.
 
cjd1965 said:
Is the control 4 to 20 mA or 0 to 10V etc ?


There maybe tiny variation in plc signal or noise like emc causing the drive to pick up a speed reference. Does the vibration go away if you disconnect the speed reference
Click to expand...

I completely control the drive with Ethernet/IP. I think it has something to do with the drive‘s internal management when in control mode and Target speed 0.
Maybe it toggles between encoder increments and that causes this vibration around standstill speed. The motor has an 2048 increment encoder.
 
Last edited:
BITS N BYTES said:
Been a while since I worked with this drive. If I recall correctly you could use the Sleep/Wake parameters [351-355] to limit movement until a minimum reference level [Volts or Current] is reached.
Click to expand...

Thanks for that hint! I will have a detailed view on that parameters the next days and will give feedback.
 

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