Just going to see who might be lurking here or possibly a contact to someone that could offer a little advice on test and repair of this PSU. Long story short, we are trying to repair an industrial VFD that 'did' power up except when estop was cleared, which should charge the DC buss, it failed to close a contactor to charge the buss. While messing with the drive a while, the PSU decided to take a nap. It was previously tested and all voltages were present, stable, and clean. Then they all went south for a while and the control board display went blank.
The PSU is provided unregulated DC 280-350VDC from another board and it kicks out regulated 5V/15V/24V. I have it on the bench now and it is providing stable voltage but I need to test it further as I suspect it is not providing the amperage it should. Schematics are NOT available and the OEM won't even tell me how much power it should provide so I am left to figure that out.
The PSU is provided unregulated DC 280-350VDC from another board and it kicks out regulated 5V/15V/24V. I have it on the bench now and it is providing stable voltage but I need to test it further as I suspect it is not providing the amperage it should. Schematics are NOT available and the OEM won't even tell me how much power it should provide so I am left to figure that out.
Attachments
-
1 MB Views: 16