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Author Topic: i need to control spindle inverter by mach 3  (Read 10332 times)

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i need to control spindle inverter by mach 3
« on: August 13, 2009, 02:50:14 PM »
hello everyone..
i have 3 phase ac inverter.. and im to buy a breakout board ... ill use 3 G320 ... i was yo buy G100 but they told me smooth stepper is much better..
so now i want to buy smooth stepper... but at the same time i think that it doesnt have analogue output .. so how can i run my inverte??? 0-10 v to control speed???

smooth stepper is better or c23 or c11  ...
i need max inputs and outputs..
please help me as soon as possible

haig.artin@yahoo.com
Re: i need to control spindle inverter by mach 3
« Reply #1 on: August 13, 2009, 03:03:26 PM »
its the first time to me to make a cnc ..
do i have to use smooth stepper with c23????

Offline poppabear

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Re: i need to control spindle inverter by mach 3
« Reply #2 on: August 13, 2009, 07:13:12 PM »
You have other options as well using modbus boards both of these hook up through the serial modbus in mach3:

1). Peter Holman sells one called the Mod IO, it has 3 Analog in and outs, 8 digital in, and 8 out Plus MPG.
2). Aurturo of CNC4PC has a M13/M1 that has 4 analog in, 4 analog out, 28 digital inputs, 28 digital outputs.

There are other options that you have already discussed as well.

scott
fun times
Re: i need to control spindle inverter by mach 3
« Reply #3 on: August 14, 2009, 02:01:06 PM »
what about using a C25 terminal board with with thte smooth stepper.. and then connect it to the c6 variable speed controller???


Re: i need to control spindle inverter by mach 3
« Reply #4 on: August 14, 2009, 03:34:40 PM »
It is pretty simple to convert PWM to analog voltage.  If you feed the PWM into a RC low pass filter (1 resistor, 1 capacitor), you will get an analog voltage.  The max voltage will be the PWM on voltage.  That will give you 0 to PWM on voltage.  You may be able to scale that up to the max speed you want in the invertor settings.

If not, you feed the PWM into a transitor first with the collector connected to 10V.  The invertor probably has a 10V source for using a pot for the 0-10V.  You may even find the 0-10V input connection already has a built in low pass filter.  See my ASCII attempt at a schematic below.  R1/C1 is the filter.  Search the web on how to determine the values based on the resolution you want and the PWM freq you choose.

If you get lucky, there already is a low pass filter, you can scale the voltage to speed you want in the invertor settings and you can directly connect the PWM to the invertor.


                    VCC  10V
                     +
                     |
                    .-.
                    | |
                    | |
                    '-'
                     |
                     |
                     |    ___R1
                     |---|___|---+--->   0-10V
                     |           |
          ___      |/            |
PWM >----|___|-----|             |
                   |>           --- C1
                     |          ---
                     |           |
                     |-----------+
                     |
                    ===
                     =  GND
Re: i need to control spindle inverter by mach 3
« Reply #5 on: August 14, 2009, 03:38:56 PM »
BUT WHAT ILL GET FROM THE C25 TERMINAL BOARD IS STEP AND DIRECTION ....
Re: i need to control spindle inverter by mach 3
« Reply #6 on: August 14, 2009, 03:49:23 PM »
Mach or Smoothstepper can output PWM for the spindle.
Re: i need to control spindle inverter by mach 3
« Reply #7 on: August 14, 2009, 04:26:12 PM »
HOW TO SET THAT??