On Wednesday, June 4, 2014 2:40:31 PM UTC-4, PCS wrote:
Hi,



Not too far OT as this is a lathe motor.



Yaskawa 606 PC3 VFD 240V/3ph AC in & out driving a Baldor 5hp inverter-rated CNC lathe motor.



Had the inverter rebuilt, new caps, reinstalled and works fine, but now the motor rings on deceleration.



It does have a braking resistor in the circuit.



Cable from VFD to motor is short, under one meter in length.



I do have the PC3 manual, and I have studied it.

It gets a bit complex for me in some chapters ;-)



I'm assuming that a decel-time parameter was reset.

That, or I need to use an S-curve decel?

Any ideas what parameter to play with and which way it needs to go?



In general, what's up with a 3ph AC motor on a short cable ringing?



Thanks for any thoughts.



--

PaulS

Hi,

To follow up; what worked in my case was to adjust the frequency lower limit, constant #25, to a value of 10%. This changed the frequency profile and stopped the motor ringing for my particular application.

Hope that helps.

--
PaulS