Spindle speed only 1/2

[ossito]

hey everybody,

On my Quintax cnc I replaced a HSD 919 ES 380v, 200hz, 2 pole spindle with a HSD 929 ES 380v, 400hz, 4 pole model.

I have a Yaskawa V1000 vfd, more than capable of operating the new spindle.

Problem I have is that after changing the parameters for max freq to 400hz, and changing the poles to 4, the spindle runs at only 1/2 speed from what I input on Fagor controller.
I believe the controller uses a 0-10vdc reference voltage as input from controller to vfd.

Another thing is when I input 24000rpm from controller, the vfd reads out 400hz, which to me looks to be correct. but I am completely unsure.

Here are some rpm inputs with outputs read from digital display of VFD.

• 1000rpm = 16.6Hz

• 10000rpm = 166Hz with 5.6 Amps output

• 15000rpm = 250Hz

• 18000rpm = 300Hz with 5.8 Amps output

• 22000rpm = 367 Hz

• 24000rpm = 400Hz with 6 Amps output

here is a picture of label off spindle


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[Jim Dawson]

The 4 pole motor will run at 1/2 the speed of the 2 pole motor at the same frequency. So if you were getting 24,000 RPM at 400 Hz with the 2 pole motor, you will only be getting 12,000 RPM with the 4 pole motor.

Did you set the VFD pole parameter from 2 to 4 when you changed motors. Many but not all VFDs have a parameter for that.

[ossito]

The 4 pole motor will run at 1/2 the speed of the 2 pole motor at the same frequency. So if you were getting 24,000 RPM at 400 Hz with the 2 pole motor, you will only be getting 12,000 RPM with the 4 pole motor.

Did you set the VFD pole parameter from 2 to 4 when you changed motors. Many but not all VFDs have a parameter for that.

yep, changed that parameter, only ones I thought I need to change was the poles and freq, but there must be something else.

I am going to find me another tachometer to use and re-check spindle speed, all I have now is a Stewart Warner handheld tach max 4k rpms.

[Jim Dawson]

Well, if the VFD says it's running at 400 Hz, the motor nameplate indicates it turns 12,000 RPM at 400 Hz. Which is correct for a 4 pole motor, 30 RPM/Hz or 1800 RPM at 60 Hz. So 400 x 30 = 12,000 RPM. To get 24,000 RPM you would have to run the VFD at 800 Hz. Some VFDs have this capability, not sure about yours.

[ossito]

Well, if the VFD says it's running at 400 Hz, the motor nameplate indicates it turns 12,000 RPM at 400 Hz. Which is correct for a 4 pole motor, 30 RPM/Hz or 1800 RPM at 60 Hz. So 400 x 30 = 12,000 RPM. To get 24,000 RPM you would have to run the VFD at 800 Hz. Some VFDs have this capability, not sure about yours.

You just hit on something, I think i set max rpm at 24k in parameters, I'm going to change it to 12k. Will let you know if it works

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[ossito]

Ok I was so sleepy before, after reading your initial reply. On the 2 pole motor it ran 24k rpms @200Hz, 380v, and the amperage should be near the 18A max in the 2 pole motor.
The 4 pole motor , should do same 24k rpm @400hz 380v, but at approx 12A. These are all no load conditions I believe.

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[mactec54]

Ok I was so sleepy before, after reading your initial reply. On the 2 pole motor it ran 24k rpms @200Hz, 380v, and the amperage should be near the 18A max in the 2 pole motor.
The 4 pole motor , should do same 24k rpm @400hz 380v, but at approx 12A. These are all no load conditions I believe.

Sent from my Nexus 6P using Tapatalk

400Hz will only give you 12,000RPM with this spindle, check your spindle spec's

[ossito]

Holy crap, you are so correct I even had just now found equation as I seen your reply,

RPM=(frequency * 120)/# of poles in motor

I am slapping myself.

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[ossito]

Finally solved the issue the spindle parameters in the Fagor 8055 controller needed to be changed, 4 parameters called MAXGEAR1, 2, 3, 4 were set to 24000, that info relates to the 0-10vdc reference voltage sent to the vfd.
So if number is 24000, and I input 24000 it tells CNC to send the 10vdc signal which represents the max freq possible on vfd, in this case it is 400hz with 4 poles. As I know is just 12k rpm.

Changing MAXGEAR parameters to 12000 now matched the speed the spindle was actually spinning in the first place. Fagor controller screen shown below.

Now I am looking for a 4-pole, 400V, 800HZ VFD any suggestions?

[mactec54]

Finally solved the issue the spindle parameters in the Fagor 8055 controller needed to be changed, 4 parameters called MAXGEAR1, 2, 3, 4 were set to 24000, that info relates to the 0-10vdc reference voltage sent to the vfd.
So if number is 24000, and I input 24000 it tells CNC to send the 10vdc signal which represents the max freq possible on vfd, in this case it is 400hz with 4 poles. As I know is just 12k rpm.

Changing MAXGEAR parameters to 12000 now matched the speed the spindle was actually spinning in the first place. Fagor controller screen shown below.

Now I am looking for a 4-pole, 400V, 800HZ VFD any suggestions?

You are using one of the best VFD drive built, with the V1000 and there custom software you can have up to 1000Hz here is a PDF that might put you in the right direction

[ossito]

Thank you I will call them tomorrow

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