开云体育

Hi,

No, the G540 pins 7 and 9 do not output a 12V supply on their own.

The G540 generates an isolated control voltage on pin 8. The amplitude of the voltage is voltage is a percentage of the voltage that is supplied to pins 7,8 of the G540. The percentage is derived from the Mark/space ratio of the PWM signal from Mach3 that is present of pin 14 of the G540's DB25 connector.

So, if the duty cycle (mark/space) ratio is 25%, then the voltage output on pin 8 of the terminal block will be 25% of the voltage you supply across pins 7,9. In this example, if you supply pins 7 and 9 with 10V, the G540 will generate 2.5V on pin 8.
If you supply pins 7 and 9 with 12V, the G450 will generates 3V on pin 8 when Mach3 outputs a PWM with a duty cycle of 25%

Note, the recommended max voltage supply across pins 7,9 is 12Vdc.

Cheers,

Peter

Excellent, what type of power supply can I use for this as it appears a
second power supply is required

Thanks

Chris

Hi,

Without exception (from my experience to date ) all VFD's have a 10Vdc supply that is used as a power supply for attaching a manual speed potentiometer. This 10V supply is used to provide power to the G540 VFD pins 7 and 9.

If you are controlling a DC motor controller that does not provide such a supply you will need to use an auxillary dc power supply of a voltage that suits you spindle speed controller's input ?specification.

NOTE: This auxillary supply NEEDS TO BE AN ISOLATED SUPPLY!!!! as the 0v reference for this supply may be near main potential voltage. 110/220V. ?If you don't use an isolated supply you may end up destroying your motor controler, cnc controller, PC and yourself.

If you don't understant the above then DON'T attempt to wire it up as the voltages involved may kill you. Also, any work involved with Mains Voltage needs to be done by a qualified electrician.

Cheers,

Peter

-------------------------
Peter Homann
http://www.homanndesigns.com/store

On Wed 11/03/15 9:15 AM , "Chris microcnc_31@... [mach1mach2cnc]" wrote:

Excellent, what type of power supply can I use for this as it appears a
second power supply is required

Thanks

Chris

-----Original Message-----
From: mach1mach2cnc@... [mach1mach2cnc@...]
Sent: Tuesday, March 10, 2015 1:59 PM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] VFD and PWM and G540

Hi,

No, the G540 pins 7 and 9 do not output a 12V supply on their own.

The G540 generates an isolated control voltage on pin 8. The amplitude of
the voltage is voltage is a percentage of the voltage that is supplied to
pins 7,8 of the G540. The percentage is derived from the Mark/space ratio of
the PWM signal from Mach3 that is present of pin 14 of the G540's DB25
connector.

So, if the duty cycle (mark/space) ratio is 25%, then the voltage output on
pin 8 of the terminal block will be 25% of the voltage you supply across
pins 7,9. In this example, if you supply pins 7 and 9 with 10V, the G540
will generate 2.5V on pin 8.
If you supply pins 7 and 9 with 12V, the G450 will generates 3V on pin 8
when
Mach3 outputs a PWM with a duty cycle of 25%

Note, the recommended max voltage supply across pins 7,9 is 12Vdc.

Cheers,

Peter



On 11/03/2015 3:48 AM, Chris microcnc_31@... [mach1mach2cnc] wrote:
>
>
> Hello:
>
> Can anyone tell me how the PWM signal comes out of Mach?. And if you
> have made connection correctly from G540?. Pin 7,8 and 9 are connected
> to VFD, Does pin
> 7 and 9 put out 12V on their own?
>
> Thanks
>
> Chris
>
>
>
>

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开云体育

No I don't think I was over the top.

If you use a multimeter to measure the voltage across the manual speed potentiometer of a KBIC-120 controller you will get a reading around 10-15V.

Touch the wire that is the 0V side of that measurement and you will get a main voltage shock. Connect that 0V wire to the 0V of your breakout board and you will release a lot of magic smoke.

On the KBIC, the 10V terminal(P3) sits at 115V, the 0V terminal sits at around 100V.

So yes, the 10 volts can kill you.

Peter.

Read up on what reference voltage is.



(Or read Peter’s post again – he tells you.)







From: mach1mach2cnc@... [mailto:mach1mach2cnc@...]
Sent: Wednesday, 11 March 2015 4:32 PM
To: mach1mach2cnc@...
Subject: RE: [mach1mach2cnc] VFD and PWM and G540








Peter:



Did you just go over the top 10 volt DC will kill you. The pin our isolated (7&9) on 540 as we know it. I let you know if I blow something up



Good trying



C



From: mach1mach2cnc@... [mailto:mach1mach2cnc@...]
Sent: Tuesday, March 10, 2015 9:49 PM
To: mach1mach2cnc@...
Subject: RE: [mach1mach2cnc] VFD and PWM and G540






Hi,

Without exception (from my experience to date ) all VFD's have a 10Vdc supply that is used as a power supply for attaching a manual speed potentiometer. This 10V supply is used to provide power to the G540 VFD pins 7 and 9.

If you are controlling a DC motor controller that does not provide such a supply you will need to use an auxillary dc power supply of a voltage that suits you spindle speed controller's input specification.

NOTE: This auxillary supply NEEDS TO BE AN ISOLATED SUPPLY!!!! as the 0v reference for this supply may be near main potential voltage. 110/220V. If you don't use an isolated supply you may end up destroying your motor controler, cnc controller, PC and yourself.

If you don't understant the above then DON'T attempt to wire it up as the voltages involved may kill you. Also, any work involved with Mains Voltage needs to be done by a qualified electrician.

Cheers,

Peter

-------------------------
Peter Homann


On Wed 11/03/15 9:15 AM , "Chris microcnc_31@... [mach1mach2cnc]" <mach1mach2cnc@...> wrote:

Excellent, what type of power supply can I use for this as it appears a
second power supply is required

Thanks

Chris

-----Original Message-----
From: mach1mach2cnc@... [mach1mach2cnc@...]
Sent: Tuesday, March 10, 2015 1:59 PM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] VFD and PWM and G540

Hi,

No, the G540 pins 7 and 9 do not output a 12V supply on their own.

The G540 generates an isolated control voltage on pin 8. The amplitude of
the voltage is voltage is a percentage of the voltage that is supplied to
pins 7,8 of the G540. The percentage is derived from the Mark/space ratio of
the PWM signal from Mach3 that is present of pin 14 of the G540's DB25
connector.

So, if the duty cycle (mark/space) ratio is 25%, then the voltage output on
pin 8 of the terminal block will be 25% of the voltage you supply across
pins 7,9. In this example, if you supply pins 7 and 9 with 10V, the G540
will generate 2.5V on pin 8.
If you supply pins 7 and 9 with 12V, the G450 will generates 3V on pin 8
when
Mach3 outputs a PWM with a duty cycle of 25%

Note, the recommended max voltage supply across pins 7,9 is 12Vdc.

Cheers,

Peter



On 11/03/2015 3:48 AM, Chris microcnc_31@... [mach1mach2cnc] wrote:

Hello:

Can anyone tell me how the PWM signal comes out of Mach?. And if you
have made connection correctly from G540?. Pin 7,8 and 9 are connected
to VFD, Does pin
7 and 9 put out 12V on their own?

Thanks

Chris

开云体育

i checked the manual for my KBIC speed control and it is clear that what you describe is the case. i also measured from the pot to ground (earth) and was shocked to find just what you describe. the question is why? does it have to be done this way? is the same true for the Chinese VFD controllers? i guess you could make a simple circuit with a digital pot but it makes more sense to buy your board that does everything correctly.

?

No I don't think I was over the top.

If you use a multimeter to measure the voltage across the manual speed
potentiometer of a KBIC-120 controller you will get a reading around 10-15V.

Touch the wire that is the 0V side of that measurement and you will get a main
voltage shock. Connect that 0V wire to the 0V of your breakout board and you
will release a lot of magic smoke.

On the KBIC, the 10V terminal(P3) sits at 115V, the 0V terminal sits at around
100V.

So yes, the 10 volts can kill you.

Peter.

On 11/03/2015 4:31 PM, Chris microcnc_31@... [mach1mach2cnc] wrote:
>
>
> Peter:
>
> Did you just go over the top 10 volt DC will kill you. The pin our isolated
> (7&9) on 540 as we know it. I let you know if I blow something up
>
> Good trying
>
> C
>
> *From:*mach1mach2cnc@... [mailto:mach1mach2cnc@...]
> *Sent:* Tuesday, March 10, 2015 9:49 PM
> *To:* mach1mach2cnc@...
> *Subject:* RE: [mach1mach2cnc] VFD and PWM and G540
>
>
> Hi,
>
> Without exception (from my experience to date ) all VFD's have a 10Vdc supply
> that is used as a power supply for attaching a manual speed potentiometer.
> This 10V supply is used to provide power to the G540 VFD pins 7 and 9.
>
> If you are controlling a DC motor controller that does not provide such a
> supply you will need to use an auxillary dc power supply of a voltage that
> suits you spindle speed controller's input specification.
>
> NOTE: This auxillary supply NEEDS TO BE AN ISOLATED SUPPLY!!!! as the 0v
> reference for this supply may be near main potential voltage. 110/220V. If
> you don't use an isolated supply you may end up destroying your motor
> controler, cnc controller, PC and yourself.
>
> If you don't understant the above then DON'T attempt to wire it up as the
> voltages involved may kill you. Also, any work involved with Mains Voltage
> needs to be done by a qualified electrician.
>
> Cheers,
>
> Peter
>
> -------------------------
> Peter Homann
>
>
> On Wed 11/03/15 9:15 AM , "Chris microcnc_31@...
> [mach1mach2cnc]" <mach1mach2cnc@...
> > wrote:
>
> Excellent, what type of power supply can I use for this as it appears a
> second power supply is required
>
> Thanks
>
> Chris
>
> -----Original Message-----
> From: mach1mach2cnc@...
> [mach1mach2cnc@...]
> Sent: Tuesday, March 10, 2015 1:59 PM
> To: mach1mach2cnc@...
> Subject: Re: [mach1mach2cnc] VFD and PWM and G540
>
> Hi,
>
> No, the G540 pins 7 and 9 do not output a 12V supply on their own.
>
> The G540 generates an isolated control voltage on pin 8. The amplitude of
> the voltage is voltage is a percentage of the voltage that is supplied to
> pins 7,8 of the G540. The percentage is derived from the Mark/space ratio of
> the PWM signal from Mach3 that is present of pin 14 of the G540's DB25
> connector.
>
> So, if the duty cycle (mark/space) ratio is 25%, then the voltage output on
> pin 8 of the terminal block will be 25% of the voltage you supply across
> pins 7,9. In this example, if you supply pins 7 and 9 with 10V, the G540
> will generate 2.5V on pin 8.
> If you supply pins 7 and 9 with 12V, the G450 will generates 3V on pin 8
> when
> Mach3 outputs a PWM with a duty cycle of 25%
>
> Note, the recommended max voltage supply across pins 7,9 is 12Vdc.
>
> Cheers,
>
> Peter
>
>
>
> On 11/03/2015 3:48 AM, Chris microcnc_31@...
> [mach1mach2cnc] wrote:
> >
> >
> > Hello:
> >
> > Can anyone tell me how the PWM signal comes out of Mach?. And if you
> > have made connection correctly from G540?. Pin 7,8 and 9 are connected
> > to VFD, Does pin
> > 7 and 9 put out 12V on their own?
> >
> > Thanks
> >
> > Chris
> >
> >
> >
> >
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> ">
>
>
>
> ------------------------------------
>
> ------------------------------------
>
>
> "> - Web site Access
> ------------------------------------
>
> Yahoo Groups Links
>
>
>
>
>
>
> ------------------------------------
> Posted by: Chris <microcnc_31@... >
> ------------------------------------
>
>
> "> - Web site Access
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> Yahoo Groups Links
>
>
> (Yahoo! ID required)
>
> mach1mach2cnc-fullfeatured@...
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--

Best regards, Spencer Chase
67550-Bell Springs Rd.
Garberville, CA 95542 Postal service only.
Laytonville, CA 95454 UPS only.
Spencer@...

(425) 791-0309

The KBIC is NOT isolated from the mains, there is NO transformer inside of it. There is no need for it to be and it would just add to the cost to do so. Since they have made them for 25 years or so I guess the design is solid. With a VFD you have a completely different type of speed controller. It takes the incoming AC, rectifies it to DC, then switches the DC quite quickly to produce AC again at the desired frequency. The control circuits on most VFDs are isolated but you should always RTFM to be sure.



Jeff Birt

Soigeneris.com



From: mach1mach2cnc@... [mailto:mach1mach2cnc@...]
Sent: Wednesday, March 11, 2015 10:43 AM
To: mach1mach2cnc@...
Subject: Re: [mach1mach2cnc] VFD and PWM and G540





i checked the manual for my KBIC speed control and it is clear that what you describe is the case. i also measured from the pot to ground (earth) and was shocked to find just what you describe. the question is why? does it have to be done this way? is the same true for the Chinese VFD controllers? i guess you could make a simple circuit with a digital pot but it makes more sense to buy your board that does everything correctly.

On 3/11/2015 1:35 AM, Peter Homann groups@... [mach1mach2cnc] wrote:



No I don't think I was over the top.

If you use a multimeter to measure the voltage across the manual speed
potentiometer of a KBIC-120 controller you will get a reading around 10-15V.

Touch the wire that is the 0V side of that measurement and you will get a main
voltage shock. Connect that 0V wire to the 0V of your breakout board and you
will release a lot of magic smoke.

On the KBIC, the 10V terminal(P3) sits at 115V, the 0V terminal sits at around
100V.

So yes, the 10 volts can kill you.

Peter.

On 11/03/2015 4:31 PM, Chris microcnc_31@... [mach1mach2cnc] wrote:

Peter:

Did you just go over the top 10 volt DC will kill you. The pin our isolated
(7&9) on 540 as we know it. I let you know if I blow something up

Good trying

C

*From:*mach1mach2cnc@... [mailto:mach1mach2cnc@...]
*Sent:* Tuesday, March 10, 2015 9:49 PM
*To:* mach1mach2cnc@...
*Subject:* RE: [mach1mach2cnc] VFD and PWM and G540


Hi,

Without exception (from my experience to date ) all VFD's have a 10Vdc supply
that is used as a power supply for attaching a manual speed potentiometer.
This 10V supply is used to provide power to the G540 VFD pins 7 and 9.

If you are controlling a DC motor controller that does not provide such a
supply you will need to use an auxillary dc power supply of a voltage that
suits you spindle speed controller's input specification.

NOTE: This auxillary supply NEEDS TO BE AN ISOLATED SUPPLY!!!! as the 0v
reference for this supply may be near main potential voltage. 110/220V. If
you don't use an isolated supply you may end up destroying your motor
controler, cnc controller, PC and yourself.

If you don't understant the above then DON'T attempt to wire it up as the
voltages involved may kill you. Also, any work involved with Mains Voltage
needs to be done by a qualified electrician.

Cheers,

Peter

-------------------------
Peter Homann


On Wed 11/03/15 9:15 AM , "Chris microcnc_31@...
<mailto:microcnc_31@...> <mailto:microcnc_31@...> [mach1mach2cnc]" <mach1mach2cnc@...
<mailto:mach1mach2cnc@...> <mailto:mach1mach2cnc@...>> wrote:

Excellent, what type of power supply can I use for this as it appears a
second power supply is required

Thanks

Chris

-----Original Message-----
From: mach1mach2cnc@... <mailto:mach1mach2cnc@...> <mailto:mach1mach2cnc@...>
[mach1mach2cnc@...]
Sent: Tuesday, March 10, 2015 1:59 PM
To: mach1mach2cnc@... <mailto:mach1mach2cnc@...> <mailto:mach1mach2cnc@...>
Subject: Re: [mach1mach2cnc] VFD and PWM and G540

Hi,

No, the G540 pins 7 and 9 do not output a 12V supply on their own.

The G540 generates an isolated control voltage on pin 8. The amplitude of
the voltage is voltage is a percentage of the voltage that is supplied to
pins 7,8 of the G540. The percentage is derived from the Mark/space ratio of
the PWM signal from Mach3 that is present of pin 14 of the G540's DB25
connector.

So, if the duty cycle (mark/space) ratio is 25%, then the voltage output on
pin 8 of the terminal block will be 25% of the voltage you supply across
pins 7,9. In this example, if you supply pins 7 and 9 with 10V, the G540
will generate 2.5V on pin 8.
If you supply pins 7 and 9 with 12V, the G450 will generates 3V on pin 8
when
Mach3 outputs a PWM with a duty cycle of 25%

Note, the recommended max voltage supply across pins 7,9 is 12Vdc.

Cheers,

Peter



On 11/03/2015 3:48 AM, Chris microcnc_31@...
<mailto:microcnc_31@...> <mailto:microcnc_31@...> [mach1mach2cnc] wrote:

Hello:

Can anyone tell me how the PWM signal comes out of Mach?. And if you
have made connection correctly from G540?. Pin 7,8 and 9 are connected
to VFD, Does pin
7 and 9 put out 12V on their own?

Thanks

Chris

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