[Eldon_Joh]

This was for someone that posted here, and there post was removed, so all you see is my post the poster was blinkstrikebob, as you can see in the Quote, which had posed the same thing in 4 different threads


Your post I answered, as did others, there is not anymore answers you need for you post, just go to it and run it, with normal settings I post for these 400Hz Spindles

220v spindle on 110v vfd probably requires changing some settings, as i already explained.

[mactec54]

220v spindle on 110v vfd probably requires changing some settings, as i already explained.

What you explained is incorrect

That would be a mistake if you changed anything that is not normal for these Spindles, they are 400Hz and the VFD drive must be set for Max and Minimum speed there is not much else that would have any affect as to how the Spindle runs

If you fail to use the correct V/F ratio the spindle will burn up, can he run it at your suggested speed yes he can as it will have the correct V/F ratio right the way through the operating range,( if the Parameters are set correct, normal for this Spindle ) the only thing that will be missing even if he ran it at full speed is the spindle will not have it's normal full torque, so even at the 12,000RPM and 200Hz it still will be lacking the normal torque the spindle would have running on 220v, the main problem is the Dc Bus Voltage will be half of what it needs to be no matter what speed he runs it at

His best solution is to buy the correct VFD Drive

[Eldon_Joh]

What you explained is incorrect

and just how much power do you think he will get from his 220v/400hz spindle on a 110vac/400hz drive with the default settings you seem to be saying will work?


all he has to do is reprogram the drive to deliver 110v/200hz and his 220v spindle will deliver nameplate torque up to 200hz at which point the torque will drop.

do you understand how induction motors work?

can he run it at your suggested speed yes he can as it will have the correct V/F ratio right the way through the operating range,( if the Parameters are set correct, normal for this Spindle ) the only thing that will be missing even if he ran it at full speed is the spindle will not have it's normal full torque, so even at the 12,000RPM and 200Hz it still will be lacking the normal torque the spindle would have running on 220v, the main problem is the Dc Bus Voltage will be half of what it needs to be no matter what speed he runs it at

honestly i can't tell if you're confused, or intentionally providing bad advice.

"the only thing that will be missing even if he ran it at full speed is the spindle will not have it's normal full torque," yeah, about a fourth of the torque. if half of this torque is air and bearing drag at 400hz it will be useless.

if he does as i suggest he will develop full torque from zero to 200hz.

"so even at the 12,000RPM and 200Hz it still will be lacking the normal torque the spindle would have running on 220v, the main problem is the Dc Bus Voltage will be half of what it needs to be no matter what speed he runs it at"

not at all correct, when he reprograms the vfd to deliver 110vac at 200hz it will have nameplate volts per hz and it will develop full nameplate torque which means he will get half the shaft hp the motor is rated for at 200hz, or about the same power as he had with his 110vac/400hz spindle when it was running at 400hz.

depending on how lossy the motor is, it could be overloaded slightly at the lower frequency to compensate for less bearing drag, less air drag induced heating.

[mactec54]

and just how much power do you think he will get from his 220v/400hz spindle on a 110vac/400hz drive with the default settings you seem to be saying will work?


all he has to do is reprogram the drive to deliver 110v/200hz and his 220v spindle will deliver nameplate torque up to 200hz at which point the torque will drop.

do you understand how induction motors work?


honestly i can't tell if you're confused, or intentionally providing bad advice.

"the only thing that will be missing even if he ran it at full speed is the spindle will not have it's normal full torque," yeah, about a fourth of the torque. if half of this torque is air and bearing drag at 400hz it will be useless.

if he does as i suggest he will develop full torque from zero to 200hz.

"so even at the 12,000RPM and 200Hz it still will be lacking the normal torque the spindle would have running on 220v, the main problem is the Dc Bus Voltage will be half of what it needs to be no matter what speed he runs it at"

not at all correct, when he reprograms the vfd to deliver 110vac at 200hz it will have nameplate volts per hz and it will develop full nameplate torque which means he will get half the shaft hp the motor is rated for at 200hz, or about the same power as he had with his 110vac/400hz spindle when it was running at 400hz.

depending on how lossy the motor is, it could be overloaded slightly at the lower frequency to compensate for less bearing drag, less air drag induced heating.

You obvious no nothing about these spindle motors, if he uses the normal parameter that everyone else has to use it will be at 200Hz at 12,000 RPM, If he does it your way he has a high chance of smoking the Spindle motor which a lot of users have already found out when you don't use the correct Parameters

Your suggestion, of incorrect Parameter setting is not what anyone should do

[Eldon_Joh]

You obvious no nothing about these spindle motors, if he uses the normal parameter that everyone else has to use it will be at 200Hz at 12,000 RPM, If he does it your way he has a high chance of smoking the Spindle motor which a lot of users have already found out when you don't use the correct Parameters

Your suggestion, of incorrect Parameter setting is not what anyone should do

if he uses the normal parameter that everyone else has to use it will be at 200Hz at 12,000 RPM,

of course, its a 2 pole motor.

And the normal parameters for his drive will deliver at that frequency: about half of the voltage the motor needs.

which will not provide satisfactory operation.


anyhow, feel free to publish the volts per hz that both his motors need: the 1.5KW 220v spindle motor and his 800 watt 110vac spindle motor.

and then please explain how his 110v drive can deliver an appropriate voltage for both motors using default parameters. hint:its impossible. one motor is twice the voltage of the other!

[mactec54]

of course, its a 2 pole motor.

And the normal parameters for his drive will deliver at that frequency: about half of the voltage the motor needs.

which will not provide satisfactory operation.


anyhow, feel free to publish the volts per hz that both his motors need: the 1.5KW 220v spindle motor and his 800 watt 110vac spindle motor.

and then please explain how his 110v drive can deliver an appropriate voltage for both motors using default parameters. hint:its impossible. one motor is twice the voltage of the other!

You should know that NA is 120V not 110V

No you are totally lost, these spindles will not run with the VFD Drives Default settings, all you will see if you use the Default settings is a lot of smoke, it take about 8 to 12 seconds and it is all over

[Eldon_Joh]

You should know that NA is 120V not 110V

No you are totally lost, these spindles will not run with the VFD Drives Default settings, all you will see if you use the Default settings is a lot of smoke, it take about 8 to 12 seconds and it is all over

my use of the phrase default parameters was intended to refer to what you call "Parameters are set correct, normal for this Spindle"

which you have yet to define properly; Not to refer to default parameters of an off the shelf inverter which would normally be set for 240vac/60hz.

also, since you seem to indicate that he can just plug his 220v motor into his 110vac vfd and run it, my use of default parameters was also intended to refer to this statement from post #13

can he run it at your suggested speed yes he can as it will have the correct V/F ratio right the way through the operating range,( if the Parameters are set correct, normal for this Spindle ) the only thing that will be missing even if he ran it at full speed is the spindle will not have it's normal full torque, so even at the 12,000RPM and 200Hz it still will be lacking the normal torque the spindle would have running on 220v, the main problem is the Dc Bus Voltage will be half of what it needs to be no matter what speed he runs it at

--which as i already explained is false.

and you should know that you cannot get more rms volts out then you put in, as we know the OP is referring to a drive that does Not have a voltage doubler, it cannot deliver 120vac anyways. so accusing me of not knowing what i'm talking about, using 110v vs 120v nominal difference as a justification shows everyone else several levels of bs. secondly those motors may indeed be wound for 110vac or 220vac, since it is impossible for a vfd when fed from a 240vac line to actually deliver 240vac out. so it would be quite smart of the spindle manufacturer to wind the motor for the lowest line voltage they expect the vfd to be delivered. 60hz motors do this already: they typically wire the motors for 4% drop, so 230vac rather than 240.




and you have yet to provide the information i asked for