Irregular Spindle Speed

[HipoPapi]

Hello everyone I really hope somebody can help us.

We Have a Chinese built CNC that was originally equipped with an ER32 7.5 kw, 10.2 HP Colombo Spindle that we needed to send for servicing as we had problems with the threads on the collet.
Due to the quick turnaround that we needed the Chinese company sent us a Chinese spindle until they send us an other Colombo as the machine originally came with a spare spindle.
The spindle they sent us is a HQD 6.0 Kw ER32 spindle. Please see attached pictures.
After installing the new spindle we can't get it to work on a constant speed. Please see attached video.
Originally we have been controlling the spindle straight from Mach3 with no problems whatsoever but since installing the new one Mach 3 is acting funny as well throwing a soft limit error shortly after a program start.
We have been through a lot of settings with the Chinese support and us trying different settings but with no luck so far
Any questions and answers are welcome as we would really like to have this machine up end running.

Thanks in advance

BoX

Video Link: https://www.youtube.com/watch?v=ZopW...ature=youtu.be