Gents,
I’d like informed opinions from time served electricians, that is, electricians who worked with 3 phase installations in the 1990’s.
Yep, nearly 30 years ago!!
I have pulled from my store of ‘That could be useful’ a single to 3 phase converter which I bought ‘new but unused’ in 1993.
The project I had in mind at that time failed, so it never got tested. There was no User Manual that reached me.
Now I have a use for it, but have found an anomaly. The colour coding in the four way flex used for the 415V output is unlike anything I can find on the web.
I am aware the UK colour coding was ‘harmonised’ with the EEC, the hard cut off date being 2006, but I’m taking the view that in 1993, or thereabouts, manufacturers could have used the old version, or possibly been early adopters of the EEC (new) standard. I have also looked at the USA standard.
The output flex contains only 4 wires and is terminated internally in the order Black, Blue, Brown & Green / Yellow, the last of these being connected to the chassis of the converter.
The free end of the flex is not marked, neither is the terminal block inside the converter.
Internally, the Brown flex is connected to a thick Red cable, the Blue flex to a thinner Purple cable, the Brown flex to a thick Black cable.
I have included a shot of the front panel, and of the interior.
I note on the front panel that the ‘L2’ phase light is also labelled ‘Aux’, and wonder what significance this has.
I also note there are two transformers, but only two, and wonder what significance this has.
The pack of 4 large capacitors are each 50 micro-farad, and are connected in parallel (so 200 micro-farad in total).
The thin yellow wires on the capacitor bank go to a ceramic resistor, marked 6K8 5%. I assume this is a bleed down resistor so the capacitors are discharged when the convertor is switched off.
The nine cylindrical blue devices have no markings at all, and are wired away to different terminals on the Power Level switches (but not the Turbo switch).
If I had to guess I’d say the blue devices are capacitors, switched in to alter any phase difference.
I have a multimeter, but have yet to use it on this device, either to measure resistance, connectivity, or no-load voltages.
Any advice please before I connect to a 240v supply and see if I can determine which wire does what?
Thanks.
I’d like informed opinions from time served electricians, that is, electricians who worked with 3 phase installations in the 1990’s.
Yep, nearly 30 years ago!!
I have pulled from my store of ‘That could be useful’ a single to 3 phase converter which I bought ‘new but unused’ in 1993.
The project I had in mind at that time failed, so it never got tested. There was no User Manual that reached me.
Now I have a use for it, but have found an anomaly. The colour coding in the four way flex used for the 415V output is unlike anything I can find on the web.
I am aware the UK colour coding was ‘harmonised’ with the EEC, the hard cut off date being 2006, but I’m taking the view that in 1993, or thereabouts, manufacturers could have used the old version, or possibly been early adopters of the EEC (new) standard. I have also looked at the USA standard.
The output flex contains only 4 wires and is terminated internally in the order Black, Blue, Brown & Green / Yellow, the last of these being connected to the chassis of the converter.
The free end of the flex is not marked, neither is the terminal block inside the converter.
Internally, the Brown flex is connected to a thick Red cable, the Blue flex to a thinner Purple cable, the Brown flex to a thick Black cable.
I have included a shot of the front panel, and of the interior.
I note on the front panel that the ‘L2’ phase light is also labelled ‘Aux’, and wonder what significance this has.
I also note there are two transformers, but only two, and wonder what significance this has.
The pack of 4 large capacitors are each 50 micro-farad, and are connected in parallel (so 200 micro-farad in total).
The thin yellow wires on the capacitor bank go to a ceramic resistor, marked 6K8 5%. I assume this is a bleed down resistor so the capacitors are discharged when the convertor is switched off.
The nine cylindrical blue devices have no markings at all, and are wired away to different terminals on the Power Level switches (but not the Turbo switch).
If I had to guess I’d say the blue devices are capacitors, switched in to alter any phase difference.
I have a multimeter, but have yet to use it on this device, either to measure resistance, connectivity, or no-load voltages.
Any advice please before I connect to a 240v supply and see if I can determine which wire does what?
Thanks.