Help Needed, Chinese 500W Spindle RPM Does not Reach High End Limit! I have

Help Needed, Chinese 500W Spindle RPM Does not Reach High End Limit!

I have a 500W air cooled spindle that has a rating of 5500-12000rpm. I bought this from Bangood as a kit but I’ve replaced the power supply with my own 48V. I also replaced the motor controller with a PWM controller. https://www.inventables.com/technologies/spindle-speed-controller

I can’t get the RPM to go above 5000(+/-) RPM regardless of SXXXX command.

Both the input and output voltage of the PWM controller read 48V (+/-) to the spindle.

Here are my settings:
[p1frq] pwm frequency 2500 Hz
[p1csl] pwm cw speed lo 5500 RPM
[p1csh] pwm cw speed hi 12000 RPM
[p1cpl] pwm cw phase lo 0.080 [0…1]
[p1cph] pwm cw phase hi 1.000 [0…1]
[p1wsl] pwm ccw speed lo 5500 RPM
[p1wsh] pwm ccw speed hi 12000 RPM
[p1wpl] pwm ccw phase lo 0.080 [0…1]
[p1wph] pwm ccw phase hi 1.000 [0…1]
[p1pof] pwm phase off 0.000 [0…1]
https://www.banggood.com/ER11-Chuck-CNC-500W-Spindle-Motor-with-52mm-Clamps-and-Power-Supply-Speed-Governor-p-1027937.html?rmmds=detail-bottom-viewalsoview

This spindle is 100VDC, 48V isn’t enought

Operating Voltage (Output Voltage) 100V DC

In my case, I tempered with my electronics to provide 100v. The motor power provider come with Youngyu has higher power ratings than 100v, so I added my own transformer to reach 100v.

I just read your product link and found following sentences:"
But Please note that this set in our US warehouse is 220V AC and please make sure you know this.
" it seems that the unit you got requires 220v input unless you requested 110v version I guess? Have you measured the loaded idle output voltage applied to your spindle? (say the motor is turning, but no load applied)