If you feed the VFD 120VAC there's no way it'll output more than 120VAC
Nonsense¡There loads of VFDs that take 120V and output 240V. VFDs are a switch type power supply, they can be made to increase or decrease the input voltage to the desired output voltage, just like any other switch type power supply. It is all in the design.
Jeff Birt
Soigeneris.com
From: mach1mach2cnc@... [mailto:mach1mach2cnc@...]
Sent: Sunday, March 15, 2015 2:01 PM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] Re: Spindle control
Hi,
If you feed the VFD 120VAC there's no way it'll output more than 120VAC. There might be special versions available that is capable of stepping up the voltage but I've personally never run across one.
The VFD takes the AC input and rectifes it, then it generates three pahse sine(ish) output by PWM. It can't output a voltage higher than what's at the input.
For measuring the output with a DMM, read the following app note from FLUKE:
IF you decide to measure the VFD output with a scope then please be VERY (VERY!) careful. Ideally you want a high voltage differential probe for doing such measurements.
/Henrik.
15 mars 2015, Spencer Chase lists@... [mach1mach2cnc] <mach1mach2cnc@...> skrev:
Jeremy,
I figured there was little difference. Just mentioned that the main point of the article was setting the min voltage or whatever to be sure the fan came on, which is not necessary with the water cooled motor.
I am trying to get the max power from the motor and have conflicting information re the 110 volt input VFD. One place asys it outputs 220 volts three phase and another (the nameplate) says it puts out 110 volts three phase.
I think there may be some extra parameters or different settings for the 110 volt input inverter but there does not seems to be a manual for it nor is it included in the 220/330 volt manual.
the motor is working very well, just want to make it better. if the thing stalls it destroys expensive bits. i don't want to reduce feed speeds to a crawl just to prevent this. maple is not the easiest thing to route. 90% might cut at one speed and then another piece will have crazy hard grain. i'm sure i'll break a few more cutters before i get this right.
On 3/15/2015 6:24 AM, jeremywillson@... [mach1mach2cnc] wrote:
Spencer
There is absolutely no difference between the air cooled version and the water cooled version of the spindle except that you need to connect an external water pump and water supply to the water cooled variety.
This is completely independant of the the VFD control for that spindle and has zero bearing on the VFD's PD settings for the spindle.
That whole thread is to do with Huanyang VFDs and their associated spindle requirements.
--
Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...
(425) 791-0309
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