rustyovali
10th Feb 2019, 05:38 PM
Hi all,as the title says,a large piece of German machinery followed me home this week in the form of a 1970 Mossner Rekord SSF420 vertical bandsaw,3 phase of course.
378053.I've removed the motor and upon inspection of the electric motor plate I at first thought it was 2.2kw 415 volts 5 Amps 3 phase delta only.
378054On the underside of the connection box cover there was the usual diagram to change the connections to star,does this configuration also change it to low voltage ie 240volts 3phase?
On the other 2 other 3phase machines I have the motor plates list various voltages and amps,So choosing a VFD was relatively easy.
I changed the terminals to star and have temporarily connected it to the VFD I use for my shaper and it runs fine{no load},at the correct rpms at 50Hz as verified with a tacho.My question is if the plate states 415v3ph draws 5amps,is there a formula to calculate how many amps will it pull on 240v 3ph? and therefore which VFD? I have a Huanyang on the shaper and a AC tech on the mill,so maybe its time to give a Powtran a go but what size? and what model.This band saw has a hydraulic/gravity power feed system so I'd like to keep as much of the original horsepower as possible.
Thanks,Nick
378053.I've removed the motor and upon inspection of the electric motor plate I at first thought it was 2.2kw 415 volts 5 Amps 3 phase delta only.
378054On the underside of the connection box cover there was the usual diagram to change the connections to star,does this configuration also change it to low voltage ie 240volts 3phase?
On the other 2 other 3phase machines I have the motor plates list various voltages and amps,So choosing a VFD was relatively easy.
I changed the terminals to star and have temporarily connected it to the VFD I use for my shaper and it runs fine{no load},at the correct rpms at 50Hz as verified with a tacho.My question is if the plate states 415v3ph draws 5amps,is there a formula to calculate how many amps will it pull on 240v 3ph? and therefore which VFD? I have a Huanyang on the shaper and a AC tech on the mill,so maybe its time to give a Powtran a go but what size? and what model.This band saw has a hydraulic/gravity power feed system so I'd like to keep as much of the original horsepower as possible.
Thanks,Nick