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.
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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@...> [mach1mach2cnc]" <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@...>
[mach1mach2cnc@...]
Sent: Tuesday, March 10, 2015 1:59 PM
To: 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@...> [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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