Yaskawa a 1000 250 kw Drive

Cable length is a possibility...

See page 70.

https://www.miel.si/wp-content/VsebinaPDF/SIEP-C71061627C-02-YAS+A1000+UsersManual.pdf

Or... it could have a bad transistor.

...or bad cables or a bad motor...

One can look at the semi conductor output junctions quickly with an octopus.

Canyou be a bit more specific about your testing device? I've been testing transistors for over 60 years, and haven't heard of the octopus (as a testing device).

i have got no idea about octopus, but have oscilloscope.. and trying my best to reach to the root cause for it

You think maybe the IGBT is not shorted? You might try it with the motor disconnected, but the circuit that senses a shorted output may use the motor winding current to sense the short circuit.

Search for oscilloscope octopus. One can inspect the junction visually. And caps and inductors. Great for trouble shooting in-circuit un-powered boards without prints.

Thanks! I've done that, just never heard it called an octopus!

It has been called an Octopus for years because it has eight arms consisting of 2 power leads, 2 circuit probes and 4 scope leads

Thanks. As I said, I've used that method, and still have the Tektronix 2236 I used, but that was at least 20 years ago. I happen to have a questionable linear power supply on my bench right now, and have all the components on hand, so I'll set one up and try it.

What are the downstream cable parameter measurements, please?

What are the motor parameter measurements, please?

if in doubt, consult a qualified Electrician.

well thanks for your comments and suggestion.. the drive boards have been dismantled and is under checking process.. IGBT was found shorted, checking the c.t. if there is any problem with the measurement, control boards. i think the shorted igbt may have damaged the boards also, as far the control board is ok. rest could be informed later. and hope every body is fine during this epidemic situation. take care... i will be back for your assistance thank you

Equally as important as repairing or replacing <... the shorted igbt...> is isolating and removing the cause, otherwise there is a risk of recurrence. This is why the test records on the motor and its cables are still worthy of pursuit, so as to eliminate these as possibilities.

i donot have spares like the capacitor and ic.. i would like to know if i put a slightly less power electronics component like capacitor, ic. will that work and what are the probability it will again get damaged.. i had replaced all the igbt but i have doubt over these slightly less capacity of the other components (like i have 40 and machine requires 42.) those are capacitors, rectifiers etc. please suggest me

Quaiser,

Praise is due to you--for responding to us in a timely manner, doing what you can on your own, and being a cooperative member of our community.

You have fixed the symptom. As was said to you, now is the time to determine the cause (it may have been a bad IGBT, but many outside factors could cause such a failure), and then fix that cause. That is the essence of good service work.

--JMM

i donot have spares like the capacitor and ic.. i would like to know if i put a slightly less power electronics component like capacitor, ic. will that work and what are the probability it will again get damaged.. i had replaced all the igbt but i have doubt over these slightly less capacity of the other components (like i have 40 and machine requires 42.) those are capacitors, rectifiers etc. please suggest me

Usually better to go over a little than under a little...

I agree with SE's #21, except that I'd replace "usually" with "nearly always".

Manufacturers are always looking for ways to save money, and a significant part of that search involves finding the cheapest parts that will keep the device working through the warranty period in the majority of cases.

If the device failure was caused by some sudden external factor, such as a motor somehow becoming shorted, then the problem wasn't part quality, but if all external factors remain within reasonable limits, then higher quality parts will last longer.

Especially in the case of capacitors, always try to find ones with a higher voltage rating AND a higher temperature rating than the originals.

Down time and repairs are expensive. if a higher quality component costs twice as much as one having the original specs, it's probably worth it!

https://cr4.globalspec.com/thread/134413/Motor-Starter-for-250-KW-3-Phase-Induction-Motor