Greetings; Reading between the lines of the instruction sheet that came with the replacement driver of a 10+ amp DC motor controller intended to be a treadmill motor control, I find this little gem of text:
"The frequency of a pulse width modulated ISOLATED input signal MUST exceed 50HZ, otherwise damage may result." Hello! All I need between the PWNGEN output then is an opto-isolator! Specifically that is all I need, I'm already set for a 120Hz repo rate, and 240Hz will work just as well if the 120 is too noisy. Since this thing feeds a regulated 12 volts to the terminal, I see zero reason why that 12 volts cannot supply the high side voltage, and all I have to do is drive the input end of the opto direct from the PWM from the C1G interface. I'll still need the C41 for fwd, stop, reverse relay drivers, but there will be NO hot to everything circuitry on the C-41, and this would bypass the non-linearities in the C-41's PWM to Analog conversion stages. That seems to me that it would raise the frequency of at least one pole in the speed control path and ease the pain of good control without the low speed speed oscillations in the 2hz range that bothers me now when I crank up the PID.gain. The C-41 will still be needed for the run,stop,reverse control, so that means the C1G will need to drive 2 opto's which I don't believe would be a problem since its rated to source or sink 24ma. Are any of you now making a postage stamp sized single opto-isolator kit? Or do I have to invent yet another wheel? Speak up if you are making such a one signal beast. Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> NOTICE: Will pay 100 USD for an HP-4815A defective but complete probe assembly. ------------------------------------------------------------------------------ Flow-based real-time traffic analytics software. Cisco certified tool. Monitor traffic, SLAs, QoS, Medianet, WAAS etc. with NetFlow Analyzer Customize your own dashboards, set traffic alerts and generate reports. Network behavioral analysis & security monitoring. All-in-one tool. http://pubads.g.doubleclick.net/gampad/clk?id=126839071&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
