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Subject: Re: RAC 3 questions

Date: 03/15/02 at 9:13 AM
Posted by: Matt
E-mail: gunthermathew@netscape.net
Message Posted:

In Reply to: Re: RAC 3 questions posted by Baek Kaesung on 03/14/02 at 7:28 PM:

I didn't know that you meant remote location.

Rpm is provided at X2 pin 21 use X2 pin 22 for
Reference. this is a Analog +/- 10Vdc signal.
0Vdc = 0 RPM
+10Vdc = Fwd RPM of Parameter A01(max RPM)
-10Vdc = Rev RPM of Parameter A01(max RPM)
Example:
Parameter A01(Max Rpm) is set to 6000,
you have a + 3.5Vdc output at X2 Pin 21 + and pin 22 -.

6000(A01 Max Rpm) / 10(A02-Max Volt Input) = 600RMP per 1Volt output at X2 pin 21 & 22.

3.5 x 600 = 2100RPM
How you display this is up to you, you can use a multimeter in a temorary situation.

As for changing speed with Pushbuttons instead of using a Pot.

Design each pushbutton circuit to provide a desired speed cmd volt. Example

Button 1 = 1Vdc = 600 RPM
Button 2 = 3Vdc = 1800 RPM
etc...

If you use this method you should also use the ramp functions to control the ramping when the speed cmd is suddenly changed. If you wish to do this I can supply you with the documentation.

Is this a temporary(debugging) need or is it something that you want to implement into your application? If you need to have something simple built for this, I could find out what it would cost me to build one and sell it to you. If this is a possibility for you e-mail me with more details. I hope this has helped.

Best Regards
GuntherMathew@netscape.net


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