[GreenKeys] What an Idiot!

[Ken Schwieker]

If connecting power to a questionable circuit it is a good idea to 
limit the current by inserting a medium wattage incandescent light 
bulb in series with the input power line. Since you are unlikely to 
have a 120 volt bulb it may be OK to use a 220 volt bulb in the 120 
volt line or the primary of the step down transformer. The motor 
would need to be temporality out of the circuit to keep it from 
loading down the part you are testing.

Ken S


At 04:27 AM 5/26/2013, you wrote:
>Some additional information.
>
>When I first blew the plug fuses I suspected a short. So I tested across the
>pins of the plug, sure enough when I switched the switch to LOCAL I measured
>a short. Removing all the plugs from the back of the CCU (this is a computer
>i/o set) the short went away. I narrowed it down to the connector marked
>with a '4' on the CCU back panel. The wires are very hard to trace because
>they are tightly packed so I am not sure where the wires for this go. I
>suspect this is not normal. However, once I connected it back to 110V, the
>machine stayed on, running open, and the fuse in the plug did not blow
>again, so I wonder if that apparent short is normal?
>
>I have since checked the internal fuses and found that two of them have
>blown. Looking from the back of the CCU they are the two on the right. I
>also checked the fuse on the far right, near the paper tape punch , which is
>fine. I wonder if it would be safe to replace the blown fuses and try
>switching on again? With other potentially damaged components could I end up
>doing more damage if I don't check and repair them first?
>
>I believe the fuses have to be "slow blow". Farnell lists some as "slow
>blow" and some as "time delay", not sure if there is a difference, but for
>one of the fuses they list "time delay" ones but not any "slow blow" ones.
>Is there a difference?
>
>Regards
>
>Rob