Need Help!- Yaskawa servo

[rai]

I have a Yaskawa servo drive CACR-SR30BE12F/M, Presently I am getting A10 alarm on servo display. Kindly help me to solve my problem, i think it's IGBT got damaged. Could somebody tell me the IGBT number & How do i test it's IGBT or transistor module.

[mactec54]

Hi rai
An A10 alarm is an overcurrent flowed through the IGBT or the heat sink of the amplifier was over heated, I can't help you with the testing it but when this happens it is usely
damaged & the drive will need repair/replacment

[cnc_guru_guy]

Hi Rai,

An overcurrent can also be caused if the motor or cable is shorted to GND. Check resistance from each motor leg to GND. Should be > 15 MOhm.

If your motor is OK, then most likely your IGBTs are bad. You can check this by measuring the resistance from UVW to the + and - terminals on the big capacitor you see in the drive. Check the resistnace both directions (red on cap, and black on cap) If you see a short (0 Ohm) the IGBT is bad.

I believe Yaskawa is phasing these drives out and they offer a newer retrofit as an option. From my experience the retrofits are very nice drives.

Hope this helps...

CNC Guru Guy

[Adamj12b]

I have some of the CACR-PR drives and looked into the retrofits. You need to replace the motors as well. which makes it really expensive. I was disappointed, as all of my motors are fine, but the drives are not.

-Adam

[cnc_guru_guy]

Adam,

I belive they can retrofit many of the PR drives as well without changing the motor, but I'm sure there are some exceptions. They used to recomend the SGDH drives which would require a motor, but now they have a drive called the Type-II.

How long ago did you ask about the PR retrofit? The Type-II has been out maybe 1-2 years now.

As far as the SR drives, almost all of them can be retrofitted to Type-II without changing the motor.

Hope this helps...

CNC Guru Guy

[Adamj12b]

REALLY?? It was some time last week that I called and talked to a support guy, and he was very quick to say that they were too old and the motors would need to be changed as well. I had looked through the manual and couldn't see any reason why they shouldn't work.

The ones I was interested in were the SGDH Sigma 2 drives. It would be nice to have drives that ran off single phase.


Thanks for the info.

-Adam

[cnc_guru_guy]

The SGDH drive only works with serial encoders and the PR motors have quadrature encoders. That is the main problem.

Definitely check on the Type-II drives. If you call Yaskawa tech support talk to the CNC group, not the Motion group. The CNC group works with the Type-II drives.

Hope this helps...

CNC Guru Guy

[cnc_guru_guy]

I just talked to one of my Yaskawa contacts and they said that only the CACR-PRxxBB and CACR-PRxxBA drives can be retrofitted to Type-II.

From your website, I see that you have CACR-PRxxBC, so the retrofit would not be possible. Sorry...

CNC Guru Guy

[Adamj12b]

Well thats a bummer. But thank you very much for clearing up the fuzzy areas.

-Adam

[mactec54]

Hi Adamj12b

The Yaskawa guy you talked to was correct your motors/drives are to old 20/25 years they have Optical encoders

Your drives can be repaired

The SGDH is Sigma II & have be around for about 10/12 years these have Incremental & Absolute Encoder support

Yaskawa is up to Sigma 5 now

The SGDH Sigma II drives & motors are great I use a lot of them still

You may be able to use your motors for a spindle drive motor if they are big enough you could run them with a VFD

[CalG]

Mactec54

What does it take to run a servo motor (speed only) with a VFD?

I have a REMUSA series Yas servo motor and several VFDs

I thought the motor would just run as a synchronous motor, but all I got was jerks and shudders.

[Adamj12b]

I have tried running some on my motors with some large vfd's and were not able to get it to spin faster then 130 RPM. The current was too high for the drive and it kept shutting down. This was a 7.5HP drive, and 2 kW servo. I believe it is because the servo is too high pole count.

-Adam