v300 20

[incar]

I have a V300 20 380v 3ph 50hz year 2010 with a problem:
the output of the transformer before the cpu,there are 2 fuses from 5 amp on the wires x4 and x1, the fuse on x4 to short circuit when I insert the plug 380v. Can you help?

[wilt]

Check Bridge Rectifier most probally blown,used to be under the Condensor coil screwed to a heat sink

[clivemtk]

more than likely a transformer blown but recomend fit new transformer and rectifier together to save imbalance

[wilt]

I thought the fuses on X1 & X4 was there to protect the processor from getting a voltage spike after the rectifier goes down?

[clivemtk]

there to protect burn out of dsr tracks x1 and x4 are tapped before rectifier

[incar]

The wires x1 and x4 out of the transformer and connected directly to the CPU DSR, do not pass through the bridge rectifier. The fuse on x4 to short circuit when I insert the plug 380v and the cpu is connected. Instead, the fuse should not be short-circuited when I insert the plug and the cpu is disconnected.

[incar]

I replaced the CPU but the fuse should always be short-circuited.