Hurco/Yaskawa Issue

[kwmkoester]

I have another issue I can't get to the bottom of... When my BMC20 powers up and I try to move the Z axis, I get a Z-axis servo fault. When I go to the drive and see it's state, it has the dash-dot that represents a normal state. But, on the X and Y axis I have 2 LED's lit, one on the P(control circuit 5v is proper) and one on the MP(Main circuit 200VDC is proper), well I only have the P LED lit on the problem Z axis drive. So, my question is: Where can I verify my 200VDC circuit voltage? I have attached a link to the manual for this drive, I can't figure out where the DC circuit is, there are plenty of ways to check the 200VAC, I just can't find any reference to 200VDC. I realize I may have to replace/repair the amp, but I would love to have a clear idea of what is wrong before I send it out for repair. Any help would be greatly appreciated! See page 43 for LED description.

http://www.yaskawa.com/site/dmservo.nsf/aa8198da5462fcbe86256c59004e4bcb/86256ec30069fdef86256de2005b9658/$FILE/TSE-S800-2.1J.pdf

[mactec54]

Hi kwmkoester

Your drives/motors are AC 200V you should not be trying to find 200VDC if you do you will do more damage to the drives it will say in the manual not to do this

[kwmkoester]

Originally Posted by mactec54 Hi kwmkoester Your drives/motors are AC 200V you should not be trying to find 200VDC if you do you will do more damage to the drives it will say in the manual not to do this

That's my point! If you look at page 43 of the manual it says that, if the MP LED is lit, that the 200VDC main circuit is proper. Well, my MP LED is not lit(like my other perfectly performing axes) and I am wondering how I troubleshoot this issue when I don't know where my 200VDC originates, I do know where my 200VAC originates though. Do you think it may be a misprint? Do you think they actually mean 200VAC? Again, thanks in advance.

[mactec54]

Hi kwmkoester

The Ac 200v is converted to the 200VDC by 1THM in page 29/30 this is inside the drive
your problem most likely is the 2 caps 1C&3C these go bad after time unless you have shorted out 1THM & then that will be bad as well do not try to measure the DC voltage as you will do more damage to the drive as I said before & do not try to measure the output to the motors as this to can smoke your drive these are old drives so be carefull with them & send it to be repaired check on ebay on the Yaskawa site as these drives come up some times there is also a repair company that advertise on the ebay Yaskawa site

[CalG]

Mactec54
How can measuring voltage smoke a drive?

CalG

[Brock_r]

Turn off the Main Power and wait about 1/2 Hr. for safety. Then reach up inside the lower left corner of the Drive and see if the Circuit breaker is tripped. If so reset it and try again. If it trips again, its time for a drive repair or replacement.

Brock

[cweiss]

Its always worth checking to make sure there are no signs of mechanical binding.

[mactec54]

Hi CalG

If you have any AC servo Drives you could try this for yourself test/measure the out put of the drive with your meter & you will damage the drive (smoke the drive is just a saying) damage the drive is the same thing this is what the manufacture Yaskawa have written in there manuals that the drive will be damaged if this is done if you know how these drives work & what is inside them you will soon see the reason for this & how they will be damaged/smoked by trying to measure the output voltage of the drive

[CNCTECHNICIAN1]

Here is what i would do.
1. remove the out-put to the drive power up try to move with hand wheel if amp trips you have a bad amp.
2. If it does not trip then install the wires back as they were then disconnect from motor side tape wires up so as not to short any thing. Power up and try to move with hand wheel. IF amp trips then check the wiring with your multi-meter with power off and both sides disconnected. Checking to ground with each lead you should read nothing.
3. IF you do not find any problems with the above step you can take your meter and go across each lead of the servo motor and you should have a low resistance a high resistance indicates that the windings have been smoked.

Make sure you use your common sense and do not do anything you are not comfortable with.
Good luck.

[CalG]

Mactec54

Thank you for trying to explain HOW a drive might be "smoked" (damaged) by measuring th output voltage. However, I fail to understand the mechanism of failure through the terms of your description.

Voltage measurement devices (VOM) offer very high resistance to any system it may be applied to. A high resistance "tap" should hardly be noticed at the output of a drive unit.

I am puzzled, as I have measured voltage at the output of VFD's and servo drives on several occasions without any sign of damage to the units. Perhaps the failure is obscure.

Please tell me more.

Regards

CalG

[mactec54]

Hi CalG

Perhaps you got luckly or the drives you were checking were not sensitive to this type of check I'm not sure what you would be measuring with because the drives put out a DC sinewave which you would not be able to measure without the right equipment

CNCTECHNICIAN1
Explains how it should be done with the power off

[kwmkoester]

I had no idea either that I could damage a drive by trying to check voltage to the motor, I will stay away until you guys get this figured out and I understand the reasons why.... I'm so confused. My Yaskawa drive is an AC servo drive, AC input, AC output, well the AC is rectified to DC at some point in the drive and that is where my issue is, the fact that the MP LED is not lit tells me this. It seems as though, from the schematics of the drive, there are only about 4 components that are responsible for this conversion and they seem like they would be easy to replace, screws and terminals, if I could source them. I have also swapped drives b/w axes and the problem moves with the drive to the other axis, so I guess I have to replace or try to fix the drive. Just kidding, I'm going to have someone else repair it, if I can't understand why I can't check output voltage on my AC drive without damaging it, then I probably shouldn't be trying to repair it. Let me know if you would like to though. Thanks as always guys, I really do appreciate your knowledge.