Since my last post, we have reversed the mounting of the alternator, re-instated the starter field the 'right' way round, and got the belts and drive all on the same side.
That left us room for the control cabinet which will house the four 6" meters which show battery volts and charge current, output volts and output current. The as yet unpainted 2" X 2" X 1/4" ali angle in the pictures are the mountings for the cabinet's rubber isolators. Two of the re-scaled meters shown below, the original scales were scanned, then digitally modified and then printed on photo-paper and stuck onto the back of the original scales:
We picked up a duplicate set of the very nice Crompton Parkinson meters last week, completely by chance.
Earlier this week we sorted out the rev-counter stand, and today we finally got volts and amps out of the beastie!
Once we were able to flash the generator field with Philip's little variable power supply, we started to see some activity on the voltage side.
At more or less nominal rev's, we were getting 33V, and it appeared that the field resistor was back to front, with too much resistance in the circuit between the brushes and the field.
Once that was changed round, we had 235V on the output, and a load was quickly organised to try the output compensation field.
We had a 1.5kW radiant heater which was a decent starting load, and we dropped 5V when that went on line. Given that we are probably not trimmed up for optimum output, that's fine, and after a few minutes running it has slightly risen in volts.
Battery charging is going to be fine also, there is 36V DC available from the dynamo side of things, and we will have to make up a small regulator circuit that will allow charging of the sealed batteries while limiting their maximum voltage.
Lister used a couple of resistors with a link, so that a high or low charge rate should be selected. That was fine for wet batteries, but not suitable for modern sealed batteries.
That leaves the way open to get the cabinet finished off, and the metering and output circutry wired up.
Peter