Thread: Spindle speed adjustment for a matsuura mc600v

I was wondering if anyone knew how to adjust the spindle speed on a MC600V... I have an issue with the NC commanding a number (S3000, S2000, etc..) and it will give me a different number if I check the speed with a tachometer... However, if I open up the electrical cabinet and look at the Spindle Speed controller, it actually displays the correct RPM! I have checked through the parameters, but I am unsure which one it is... Any ideas guys?

Nick
Converting Equipment Intl...

Couple of checks you can do.

In MDI command the spindle to spin at a speed, verify that the spindle speed override is set to 100%, then set the speed to S0. The spindle should stop rotation. If it continues to rotate or stops then rotates in the opposite direction then the issue may be the offset parameter or a POT depending on your drive model. The parameters can be changed on the spindle drive itself. If it is a POt then it should be accessible on the top board.

If the spindle stops as it should then verify if your speed is off by a specific %, if it is then there may be an issue with your override circuit and/or the DC power supply on the spindle drive.

Also check to see if it is off the same amount in both directions.

You most likely have a Yaskawa spindle drive (probably a 626) you can find the manual for all Yaskawa products on their website Search Downloads for Spindle Products

Pipes,

Thanks for the advice. I tried as you said, but it did not solve the problem. I have a feeling that it is a problem involving the Constant settings on the controller itself...

Nick

I guess it's not your calibration instrument? Just a thought. Pipes offered a very nice rendering.
Regards,

Stan-

Sadly, no.. I wish it were that simple! LOL... I cross checked the readings I was getting with the readouts on the controller LED's... They are the same... I am off by around 23%-25% as far as what it should be at compared to what it actually is spinning at...a little frustrating to say the least... but thankfully, no broken taps yet!

You haven't mentioned which model control or spindle drive you have so I can't help with specifics, however, there are a few constants (parameters) on both the control and the spindle drive that could affect the agreement of speed to command.

It unusual that these parameters change on their own without other problems from corruption showing up so you should compare the values to any hard copy documentation you have before changing anything. If you do experiment with changing parameters be diligent about noting what they were so you can change them back.

It is more likely that a power supply has drifted (those darn electrotytics!) or a potentiometer or switch has gone bad in the spindle speed over ride circuit. Of course this depends on whether you system was setup up with analog (0-10V) or digital speed reference.

Snagging the right manual from the Yaskawa website will help you a lot.

Example - page 215 of the VM3 SEI626 manual http://www.yaskawa.com/site/dmsearch...dle%20Products
http://www.yaskawa.com/site/dmsearch...dle%20Products

Pipes,

Sorry I didn't get back with the info... It is a VS626MT3...hope that helps ;-)

Check out page 48 (11.2.1) and page 64 (table 14.1 (cont'd)) of manual SEI-S626-2H:

http://www.yaskawa.com/site/DMSpindle.nsf/536df907f9fe9d5586256c4e0056b851/86256ec30066036986256ca8005bb912/$FILE/SIE-S626-2H.pdf

Thanks Pipes,

I have looked through them before you mentioned it....On the same mindset eh? I am planning on playing with the settings this weekend... And yes, I did take down a hard copy of the current settings... no sense in digging a deeper hole....

Nick