[Blakea1790]

I installed the spindle VFD with brake resistor upgrade kit a few months back and have been running fine ever since. Now, For some reason When I turn the spindle on it comes on like it should, but when I stop the spindle it now coast to a stop and I'm getting a FU.5 alarm? I looked at the manual about this and it is somewhat unclear about this issue, at least in my opinion, any help on this would be appreciated. For some reason if I run the spindle around 2000rpm I don't have this issue, only up around 3500 and above. Could it be an issue with my resistor? Or could a setting have changed?
Thanks,
Blake

[Novakon]

I am certain the resistor is working properly. Can you verify the connection terminals of the resistor to the VFD? It should be connected between the P+ and PB terminals.

If this is correct, then try changing the braking time F0.11 closer to factory default of around 4. This will allow for a longer wind down time and will also let us know if the VFD shunting circuit is the problem causing the alarm. I will need to refer to the factory about the alarm error, but unfortunately all factories are shut down for 2-3 weeks for their New Year’s celebration. Let’s see what this does for us now so we can figure the source of the alarm.

Regards,

Novakon Team

[SCzEngrgGroup]

I installed the spindle VFD with brake resistor upgrade kit a few months back and have been running fine ever since. Now, For some reason When I turn the spindle on it comes on like it should, but when I stop the spindle it now coast to a stop and I'm getting a FU.5 alarm? I looked at the manual about this and it is somewhat unclear about this issue, at least in my opinion, any help on this would be appreciated. For some reason if I run the spindle around 2000rpm I don't have this issue, only up around 3500 and above. Could it be an issue with my resistor? Or could a setting have changed?
Thanks,
Blake

FU.5 is an over-voltage during deceleration. This is almost certainly due to setting too short a braking time in F0.11. Increasing this value should solve your problem. I believe I have mine set to 0.5.

Regards,
Ray L.