17-10-2020, 12:14 AM
Fuses do not protect against the slight constant mild overload which cooks dynamos. The steady blow current is probably 20 amps or so. The various Seven models sported dynamo fuses in almost every combination possible.The later fuses seem to only protect the summer resistor.
The situation with the field connected but no output connection is the one to avoid. There is nothing to limit the voltage which soars and applied to the field can cook it. (The way to switch off a dynamo is to disconnect the field. (impractical on the DEL where internally connected) More certain still and contrary to all instinct directly earth both the wires.
The situation with the field connected but no output connection is the one to avoid. There is nothing to limit the voltage which soars and applied to the field can cook it. (The way to switch off a dynamo is to disconnect the field. (impractical on the DEL where internally connected) More certain still and contrary to all instinct directly earth both the wires.