Need a substitute/replacement for a power transistor module

[Jeff7]

I've got what may be a damaged servo amp here, and it's around 20 years old. Price for a replacement board is $1600, and the board itself might not even be the problem. There are two things here which seem to be "power transistor modules."

PDF datasheet

I found one place online that has them - no prices of course, it's all been "request a quote and hope for a response that never comes" for damn near everything associated with this project. :roll:

Is there some other name for this kind of thing? Is this a highly-specific part for which there aren't likely to be any substitutes?
Also, are there any other forums where I might get a better response?

I can't really take the damn thing apart, as it's all sealed up with epoxy.

I've got another mysterious black box in here, labeled "Nana Electronics, Type MC-0002G." Google was far less than helpful. The only other info on it is a serial number and a date. It features two 16 gauge wires going into it, and 4x 20-22 gauge.


I of course have no datasheets on the servo amp itself.

 

[LTC8K6]

http://www.surplussalesco.com/...n=VIEWPROD&ProdID=4673

 

[alkemyst]

Grangier or Greybar.

 

[waffleironhead]

the best ive found is a place that has the evK31-050 which is rated for 50 amp continuous load whereas yours seem to be 30 amp load.(figuring I read the spec sheet correctly)

156.20 at Galco

wish i had more time to do a better search for you.

comparison chart of their pm

here

 

[Jeff7]

Originally posted by: LTC8K6
http://www.surplussalesco.com/...n=VIEWPROD&ProdID=4673

Nice, that there's the one.

Is there any kind of substitute for this thing? Would new-and-similar cost more than ancient-and-used stock?

I'm going to try swapping in some of these modules from other servo amps and see if that makes a difference, though the rest of the robot has stopped working again. It's quite temperamental. And I'm not sure if the company is able to spend $160 right now, given the current financial situation.


Also, seeing that this servo amp is apparently dead, I figured I'd try to take apart one of these modules. Well it turns out that they're one of those things that you kill instantly before it's even halfway apart. Some contacts got ripped out, and some things that look like bare ICs, with tiny leads soldered to them, are also damaged. The bare IC things are covered with what appears to be very gooey silicone. So at least one will need replacing for sure.


What happened to the amp: I finally got this robot to power on, and shortly afterward, the Z-axis motor spun up to full speed quite unexpectedly, and rammed into the end of its range. After that, "servo amp error Z" appeared on the screen. After that, the same error showed up immediately on startup, so I'm making a wild guess, and saying that this amp sustained damage when its servomotor went insane.

These modules are the first things connected to the motor output, so one of them may have overloaded and destroyed itself.
But I have no real way of testing them, at least not that I know of.

 

[Jeff7]

Originally posted by: LTC8K6
http://www.surplussalesco.com/...n=VIEWPROD&ProdID=4673

For all who care: 🙂
I've found out that that is quite overpriced. I finally got quotes from two other places. Prices: $15 and $18 each.
The $15 ea. place is in China though - shipping is expected to be around $40. Still

So, is it legit?

Anyone know Chinese?🙂


They say they take orders by e-mail or fax. E-mail is out; I assume that fax would be a (in)secure as giving your credit card number over the phone.