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Messages - Viperx85

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Hey all, For some reasons this stopped happening for awhile but it has started again recently???

3
Mach4 General Discussion / Re: Setting up Spindle/VFD control Issues
« on: February 15, 2019, 08:32:08 PM »
Thanks Craig, all makes sense.

My next problem is setting up Mach4 control of the mist coolant sprayer. I plan to use the spare gecko output which is rated at 1amp 50vdc max

I have a pneumatic valve which has a 12V 4.12W Solenoid on it which I believe equates to 0.343Amps / 343milliamps

Problem is I do not have a suitable 12v power supply.

Current voltage sources are
-48V 7.3amp switching power supply (main supply running geckog540)
-5v 3amp switch mode supply (running Ethernet smooth stepper)
-Gecko chiller has a 12V 200milliamp output (currently running a box fan)
-VFD has the 12-14v output but says limited to 20ma

Could I use the same trick with the Zener Diode's and the 48v supply or is it too much of a drop from 48-12v? if its ok what value resistor would you use (and out of curiosity how do you calculate that value)

Or since its likely going to be a constant load? could I just use a Voltage divider circuit with resistors or is this once again too much of a differential between 48-12volt and resistors would get very hot?

Other possible option is I think I can get a 24v solenoid for this valve which might help? but I know there is no 48v one. 


4
Mach4 General Discussion / Re: Setting up Spindle/VFD control Issues
« on: February 15, 2019, 06:42:19 PM »
So picked up the parts during the week and wired as per your diagram and is working perfectly Thanks! https://www.machsupport.com/forum/Smileys/default/grin.gif

Just for my understanding and curiosity is it working by the zener diode "bleeding" off any voltage it "see's" above its set value to ground (in this case 10v)

What I don't understand is how this does not create a short circuit and overload the amp capacity of the VFD 12v output?

Also can you explain what the resistor does for this setup please.

I did have a small issue where the commanded hz was not matching the output. say I commanded M3 S12000 the Gecko output (reading with a multimeter) is spot on 5.00V but the VFD is outputting 210-220hz  (should be 200hz) similar at M3 S24000 Gecko output = 9.98v VFD 385hz (should be 400hz)

Im guessing this is just due to the cheap chinese VFD, I adjusted the settings in the VFD to Max expected voltage to be 9.8V and now it puts out 400hz at 24000rpm commanded but 12000rpm is still the same or slightly higher from memory... which is fine for what Im doing, no need to be exactly spot on

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Mach4 General Discussion / Re: Setting up Spindle/VFD control Issues
« on: February 08, 2019, 09:39:20 PM »
Whats a E12 Value? does that mean it wont work?

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Mach4 General Discussion / Re: Setting up Spindle/VFD control Issues
« on: February 08, 2019, 09:02:51 PM »
Ok I can get these locally:

220 Ohm 5 Watt Wire Wound Resistor or 220 Ohm 0.5 Watt Metal Film Resistor Either is cheap so I guess 5watt is overkill but better?

Also have the choice between a 9.1V zener or 10.0V zener both 1watt. Would the 10v Zener be better?

8
Mach4 General Discussion / Re: Setting up Spindle/VFD control Issues
« on: February 08, 2019, 07:59:34 PM »
Oh oops ok, lucky... I had configured it and wired it up and it was working  but yes the voltage output was changing depending on what frequency i was commanding.

Ill grab a zener and resister as you specified tho.

p.s. connecting the Gecko's -ve to the VFD comm fixed the X1 issue. it now turns on the spindle as expected :) I guess this was due to the VFD not being connected to the same power source (its connected directly to AC mains and the Gecko off a 48V DC supply) they are both earthed to the same earth star but i guess the Comm and Earth terminal on the VFD are isolated

9
Mach4 General Discussion / Re: Setting up Spindle/VFD control Issues
« on: February 08, 2019, 07:14:44 PM »
Doh, don't worry... I was thinking its weird it has a 12V output when its Analog input wants a 0-10V signal so reading the VFD manual some more it also has a Analog output which you can configure to output between 0-10v!

10
Mach4 General Discussion / Re: Setting up Spindle/VFD control Issues
« on: February 08, 2019, 06:47:12 PM »
Actually should I just get one of these?
https://www.ebay.com.au/itm/LM317-DC-DC-step-down-converter-4-2V-40V-to-1-2V-37V-linear-voltage-regulator-JO/264175708605?hash=item3d821969bd:g:Mt0AAOSwIAJb~-Xp:rk:2:pf:0

https://www.ebay.com.au/itm/LM317-DC-Linear-Converter-Down-Voltage-Regulator-Board-Speed-Control-Module/272850619516?epid=608069985&hash=item3f872a0c7c:g:jOsAAOSwuLRZvgXX:rk:1:pf:0


The first one says minimum amps is 1.5 output Id imagine the Gecko/vfd would have very small amp output? does this mean it wont work? The second link says 5-1500ma so would this be better? not sure why it has 7 pins tho?

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