Machsupport Forum
Third party software and hardware support forums. => Modbus => Topic started by: haigo 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
-
its the first time to me to make a cnc ..
do i have to use smooth stepper with c23????
-
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
-
what about using a C25 terminal board with with thte smooth stepper.. and then connect it to the c6 variable speed controller???
-
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
-
BUT WHAT ILL GET FROM THE C25 TERMINAL BOARD IS STEP AND DIRECTION ....
-
Mach or Smoothstepper can output PWM for the spindle.
-
HOW TO SET THAT??