My father in law has an old sawmill. It was refurbed in 1980 with an automatic Y-D starter, now the main contactor is defect and spares are difficult to get.
This old motor has an extremely high start current, I have not been able to measure, but it is protected with 3 fuse elements of 120 Amp, 90, amps fuse elements blows now and then, but usually they are OK. (just to identify start current in Delta)
This saw mill is the motor with a gear and a heavy saw blade. That is the starting load.
How could we do this better in a safe way.
The power supplied are stable 230V 3 phase from a delta wound transformer with no grounded point.(50 Hz)
Modern contactors are much better covered and will not fit in the old cabinet. At this stage I see no good solution within reasonable costs for that 80 years old man still playing with his sawmill.
dsk
This old motor has an extremely high start current, I have not been able to measure, but it is protected with 3 fuse elements of 120 Amp, 90, amps fuse elements blows now and then, but usually they are OK. (just to identify start current in Delta)
This saw mill is the motor with a gear and a heavy saw blade. That is the starting load.
How could we do this better in a safe way.
The power supplied are stable 230V 3 phase from a delta wound transformer with no grounded point.(50 Hz)
Modern contactors are much better covered and will not fit in the old cabinet. At this stage I see no good solution within reasonable costs for that 80 years old man still playing with his sawmill.
dsk