About AC Drive Circuit - 15hp Baldor

Blown fuses?

NO all fuses r good

pls if u have 3844b ic pin voltages during functioning can u provide me?

How about going to the manufacturer directl, or, better, looking in the Operation and Maintenance Manual for the equipment?

in operation manual its only given the connection and parameter setting procedures.

drives internal hardware is not described there. also i contacted the service engg,but they also not giving proper reply,they wants to give drive to service and there they will rectify this prob.but the counrty i am working here no service persons r available. this choke(inductor) used in SMPS section for what? and is this can give any problem? how to test this?

What you are asking for is board level service data on a manufacture's product, something typically guarded while the product is current and for some time after. If the manufacturer will not answer, the only people who can are engineers at other more qualified service companies and they make a living doing what you are attempting to do. If you find one willing to help without reimbursement, good on you. From my experience ( given freely but not too deep), this sort of failure is usually going to end up being a loose connection or a bad PC board component. Your theory on the SMPS section is sound, but rather than wasting a lot of time chasing board level component, I would just replace the board. Companies like Electrical South will have rebuilt boards available for Baldor drives even if they are out of production. Good luck.

If there is no obvious damage to any of the parts, then you can only test and repair by having a schematic and source code for the embedded microprocessor. For many good reasons, Baldor does not freely give this information to anyone. Baldor does not want their design copied or for competitors to now know how to undercut Baldor's product line.

I noticed that you did not mention the status of your motor and the mechanical load it is spinning. It is quite possible that this drive is detecting a fault in the motor and load. This driver may just be in a load failure mode that is trying to protect further damage from being done. (I doubt that this is the case but I'm just trying to be thorough.)

You may just have worn out the electronics out from use. Nothing lasts forever. The most common thing that fails with time in electronics are the electrolytic capacitors. These are the blue cans from your picture. Unfortunately when a capacitor fails it can frequently damage other components.

One of the last things I'd suspect in an electronics failure would be a transformer. The only way to know what is failing is have the schematic and source code.

thank u all for giving good responce