I apologize again my lack of terminology. The mains go into the white breaker then the board. First black position at the lowest then the white being 3rd up from there. I believe they then hit the two red wires which go to the transformer. Your suggestion would be to unplug the red wires from the board power on unplugged and plugged? It only burns the fuse while the reds are connected.Where the mains comes into the board, does it go to the transformer or straight to the relays, unplug the red wires to the transformer and see what happens.
The fuse only blows while it's connected with the red wires. So there's not really any way to check the secondaries then huh?the red wires are primary side of the transformer. make use to use time delay 2A fuse and have the red wires connected, but disconnect the plug with other wires (blue, yellow and green). this way you can see if the problem is transformer itself or circuit that it feeds.
if it still blows, even with time delay fuse and no load, transformer has internal short.
if it does not blow fuse any more, transformer is likely ok and you should be able to measure secondary voltage. check the circuit after for shorts (bridge or caps etc.)
You can unplug the secondary side and see if it blows without a load to check the transformer outputs.The fuse only blows while it's connected with the red wires. So there's not really any way to check the secondaries then huh?
Yes I'm able to use a multimeter. I will get some slow blow fuses so I can try again. I will take some more angle photos for you guys. I really appreciate the advice and patience.
Now that you know that it is the transformer causing the fuse to blow, follow my advice in the thread above, disconnecting the secondaries in turn, to determine which has the fault (causing the primary fuse to operate).
Once you find the faulty secondary circuit, further investigation will be required to identify the faulty component(s) causing the overload.
I doubt that the cause is not having a slow blow/time delay fuse fitted, a 2A (fast blow) fuse can pass 3A for a considerable time.
It's the transformer then, unbolt it and test with a multimeter.So with the red wires connected and all secondaries disconnected the fuse blows immediately. Now this was my last fast blow, which I believe is what the system came with. I'll buy some time delay to further troubleshoot but. Thoughts? I also added a lame wire schematic
It does have the rubber bushing under the large washer plate. I didn't see any visible issues.The toroidal transformer appears correctly mounted (using a mounting kit) with damping material beneath the top securing plate. Having the connecting wires at the mounting surface is normal practice – I very much doubt over tightening of the securing bolt has squashed the wires, causing the issue, since the enclosure is made of plastic.
All the toroidal transformers I’ve seen are wound with the secondary wires wound above the primary wires on the toroid. Personally I think there is likely a short within the transformer (either in the primary winding or one of the secondary’s) – which will need replacing. Once you remove the transformer, there may be an indication of the damage location.
If you are lucky there will be a rating label on the transformer side wall listing the electrical ratings (input voltage, with each secondary output voltage and current rating) – if you are even luckier, you will find a replacement transformer having the required input voltage and secondaries.
by Jake Hertz
by Dale Wilson