mickdundee63
Well-known member
- Joined
- Oct 30, 2013
- Messages
- 100
OK I'm getting to the business end of a drip fairchild 670. I began testing the power tranny secondaries today before beginning wiring but didn't get far. The mains tfmr is blowing fuses despite being out of circuit. I'm using 250v 3a slo boo fuses as recommended. I'm connecting the primaries in series using Sowter's 0526 EU (230/240v version)
http://www.sowter.co.uk/specs/0526.htm
I'm connecting red to black, using blue and brown and have isolated the white. Using my DMM I've got continuity across all primary wires even though it seems to be a dual primary. I'm thinking this means I've got a short? What are the chances of a never before used Sowter having a short? Seems unlikely but can't think what else is going wrong. My trannies have only one white but I don't see how this could be part of the problem.
The other power trannies have the same primary winding set up. They are reading around 70ohms between windings, down to 7 ohms when I connect red and black to link the windings. On the mains tmfr the is reading around 5 ohms between the windings (between blue and brown), down to 0.5 ohm when red and black are connected.
Now obviously it's highly unlikely all 3 trannies are shorted but I thought the circuit would be open between the two primary windings??
I'm sure I'm missing something here - any hints on where to research next or steps to take?
http://www.sowter.co.uk/specs/0526.htm
I'm connecting red to black, using blue and brown and have isolated the white. Using my DMM I've got continuity across all primary wires even though it seems to be a dual primary. I'm thinking this means I've got a short? What are the chances of a never before used Sowter having a short? Seems unlikely but can't think what else is going wrong. My trannies have only one white but I don't see how this could be part of the problem.
The other power trannies have the same primary winding set up. They are reading around 70ohms between windings, down to 7 ohms when I connect red and black to link the windings. On the mains tmfr the is reading around 5 ohms between the windings (between blue and brown), down to 0.5 ohm when red and black are connected.
Now obviously it's highly unlikely all 3 trannies are shorted but I thought the circuit would be open between the two primary windings??
I'm sure I'm missing something here - any hints on where to research next or steps to take?