uc300 analog set up

[omega]

Hi,
a quick hello to all on the forum.
I would like to use the analog port on the motion controller to program the speed of the spindle 0-10v, and the speed/feed over ride .

For the speed control should I set spwm value to volts, and mach 3 in spindle control to pwm?
what should the base frequency be?
The spindle should then be set up in mach3 motor outputs for the required analog port and pin?
Will that pin will now produce 0-10v for the inverter (0-10v frequency ref) to accept ?
do you then common up the 0 volts and everything should work?

On the speed/feed overrides what value and type (a or b) should the potentiometers be?

Regards
Tony

[cncdrive]

Hi,

If you using the Analog port's analog output for the spindle 0-10V control then you can set the SP PWM checkbox on the plugin page on the Analog I/O tab page.
Then the analog channel 1 will output a proprtional 0-10V to the spindle PWM duty cycle.
So, for example 50% duty cycle of the spindle speed output PWM will produce a 5Volts on the analog output 1. and 100% will produce 10Volts etc.

For the analog inputs potentiometers in the 1-10k Ohms range should work.
Make sure to buy linear potentiometers instead of exponential, because exponential potmeter will cause non-linear change of the input voltage per rotational angle as it's scaling is not linear, but exponential which can be kind of annoying.
And you can attach the FRO and SRO in the same menu in the plugin, on the Analog IO tab page, the SRO and FRO checkboxes can attach the input voltages to control the functions.

[omega]

Hi Thanks for the swift reply,
that seems straight forward, so is it wired as I suggested in my post to the inverter?
What should the base frequency be set at in mach3?

[cncdrive]

Sorry, but I don't see what did you suggest about the wiring?! Can you explain?

Since it is analog voltage it has no base frequency. You can set anything in the PWM base frequency it will not influance the analog output signal in the analog port.

[omega]

Hi The bit that says:
"Will that pin will now produce 0-10v for the inverter (0-10v frequency ref) to accept ?
do you then common up the 0 volts on the inverter and the uc300 everything should work?"

Cheers

[cncdrive]

You common the ground of the analog port of the motion controller with the analog ground of the inverter, not the PE ground, but the dedicated analog input ground of the VFD!

[omega]

Thanks im a lot happier now!

Tony