Spindle PWM

I'm new to EMC2 & electronic challenged...

Downloaded all the manual & read them with great difficulties due to my limited electronics vocabulary...

I have a stupid question, What does the Spindle PWM do? Exactly?
Does it send signal straight to the VFD to control the speed?
What is "PWM component" mean?
How would I know if I need "PWM component" for VFD?

Thank you for your attention & appriciate the help.

Ken

I have a Huanyang VFD. Do you mean I can connect the Spindle PWM terminal on the BOB directly to the VFD?
Here is the manual www.stepdrive.ru/doc/VFD%20Manual.pdf
and Q2,
How can I relate this attached circuit with this whole setup?
[/img]

It did say that the
"AM" terminal is a "output terminal of digital frequency" which has a factory setting of 0~10
Also, "VI" is "Analog Voltage Frequency Referenc input" & the factory setting is "0~ +10V corresponding to the highest operating frequency."
AND, "AI" is "Analog current Frequency Reference input" "4~20mA coresponding to the highest operating frequency"

All these sound like Alian Nation to me....

I understand what PWM, how they are made & how they are generated & a little about how they are used.signal.

In power Electronics, they are used to wack up the AC frequency to increase magnetic coupling efficiency hence the now common SMPS,

Some time PWM can emulate an analog voltage by varying the duty cycle of aDV voltage or current.

In the case of EMC2, is the Sindle PWM suppose to be this type of Psudo Analogue signal? or is this a pulse train like what they do in power electronics?? What does the VFD expect the incoming signal characteristic?

like I said, I'm trapped between unfamiliar vocab..... and I'm no electrical engineer either

I'm stuck at the dead end of how can I get EMC2 to talk to the VFD...

Beleieve me I did my share of research just don't know which keyword to find my answer...

Thats right, PWM is a way to get a variable output from a single digital (on.off only) output bit,
like the bits on a parallel port.

Many VFDs have a analog voltage speed input. The PWM output from EMC can filtered
to generate this analog voltage. Some Break Out Boards have this analog filter built in. I believe
there are some VFDs that will accepts a straight PWM signal input as well but these are not common.

PCW, Thank you for replying, your reply is what I'm hoping to know.

Do you meant to say the PWM output from the parallel port is in a pulse train form and it is a frequency signal?
If so, it would be great to know the the frequency. Unfortunately. I don't have equipment to measure the frequency.
Do you know what the frequency range might be?

Regards,

Ken

If you have system with EMC installed. type:

man pwmgen

in a terminal

otherwise

www.linuxcnc.org/docview/html/man/man9/pwmgen.9.html

As the manual explains, the frequency of EMCs PWM is settable (within limits)

To muddy the waters, for a 0-10V VFD, you may want EMC to generate PDM instead
of PWM as its easier to filter