MorrisWoodman12
Established Member
Minimal for the equipment I worked with. I would guess the same for a motor apart from rpm.
240 volts into a 220 volt machine ?
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The photo shows a control box of a premium lathe with mention of an inverter.
Unless modified, this lathe is driven by a variable frequency drive.
The motor then doesn't matter. The electronics will take care of that.
The input voltage range of the VFD is all that matters and they won't care whether 220 or 240, 50 or 60Hz.
Crack on and use it ....
Unless modified, this lathe is driven by a variable frequency drive.
The motor then doesn't matter. The electronics will take care of that.
The input voltage range of the VFD is all that matters and they won't care whether 220 or 240, 50 or 60Hz.
Crack on and use it ....
In this case nothing because the VFD controlling the motor will contril speed, but on a generic induction motor, they run about 20% higher rpm at 60Hz vs 50Hz.
TheUnicorn
Established Member
so as 60 is 120% of 50, would a machine designed for 60hz be 20% slower run on 50hz or am I just being too simplistic
edit - sideways answered my question whilst I was typing, sorry
Last edited:
It is a Oneway.
Inspector
Nyuck, Nyuck, Nyuck!
I envy you as I do with about the ten or so in our turning club that have them. Someday.
Pete
Ross Buchanan
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As I understand it (except I'm a carpenter, so its all black magic to me) in the US, houses have a 60Hz, 240volt AC Supply. 240v AC is really a waveform going from +120v to -120v. This '240v' is then split at the consumer unit giving two circuits of half wave. One circuit is from 0 to +120v, the other 0 to -240v. When the householder needs more oomph for bigger machinery, it is fairly easy to use the full wave-form to give the necessary power.
This setup was considered safer for domestic use as a jolt of 120volts is sub-lethal. They use this half-wave as if it were DC, which is how Edison set up most electrical supplies in the early 20th Century.
The disadvantage of DC power is there is a lot of voltage-drop over distance, so there needed to be lots of smaller power stations quite close together. The rival intellect of Tesla advocated for AC which does not suffer the same voltage drop, and power stations could be farther apart, but also bigger and more efficient. The result is a century-old compromise
All this is purely notional, as the actual power supplied is something to do with a "root-mean-square" calculation, at which point I drifted off, but the result is that 240v isn't actually 240volts, it just behaves as if it is
This setup was considered safer for domestic use as a jolt of 120volts is sub-lethal. They use this half-wave as if it were DC, which is how Edison set up most electrical supplies in the early 20th Century.
The disadvantage of DC power is there is a lot of voltage-drop over distance, so there needed to be lots of smaller power stations quite close together. The rival intellect of Tesla advocated for AC which does not suffer the same voltage drop, and power stations could be farther apart, but also bigger and more efficient. The result is a century-old compromise
All this is purely notional, as the actual power supplied is something to do with a "root-mean-square" calculation, at which point I drifted off, but the result is that 240v isn't actually 240volts, it just behaves as if it is
120 volts can be lethal as it is sufficient to drive the required amps through your body, the reason why we used 110 - 0 - 110 for sites and safety is because there is only 55 volts to ground.
AC has been used simply because that is all that you can generate and the voltages can be steped up or down using transformers but now with modern semiconductors Dc is offering some major advantages such as easy interconnection of networks because there is no phase to align and is very efficient over long distances with less wires. Currently you need three sets of wires per three phase circuit and often two circuits are carried on the pylons so two sets of three wires. If you look at how the Chinese get the power from the three gorges hydo plant to one of the provinces they use a Dc system of plus 500,000 volts to minus 500,000 volts over a distance of over 900Km and a capacity of 3000,000,000 watts.
You mean an RMS value which gives an AC power rating that is equivalent to a Dc system, ie 1 volt Ac RMS across a 1 ohm resister gives 1 Watt of power the same as 1 volt Dc across 1 ohm.
So if you take the 240 volt RMS then this equates to an Ac peak voltage of 240 x square root 2 = 340 volts.
Oneway appear to have manuals available here:
https://oneway.ca/manuals
Given that the OP has a clear picture of the lathe serial number, and that Oneway make at least one million fewer machines per year than Toyota, perhaps an email enquiry to them might dig up its history and the geographical market area into which it was first supplied.
https://oneway.ca/manuals
Given that the OP has a clear picture of the lathe serial number, and that Oneway make at least one million fewer machines per year than Toyota, perhaps an email enquiry to them might dig up its history and the geographical market area into which it was first supplied.
jrm688
Established Member
In North America homes are wired with both 115V and 230V (nominal) single phase. The 115v is used for most things like lights and wall receptacles. The 230V is for the larger loads like the stove (cooker), clothes dryer, water heater, electric furnaces and baseboard heaters. Any shop machine over 2 hp is usually run on 220v. A lot of the smaller machines can be wire for 115V or 230V. Since P=IV ( power= current in amps times voltage then as voltage increases current decreases for any power level. Less current = among other things, less heating. The higher voltage means less heating. The insulation should be able to handle the slight increase in voltage.
We have a lot of knowledgable people on UKW ,
Makes me feel inferior
Makes me feel inferior
