Author Topic: PVG32/120 PVEM Dither Freq and Amp Advice  (Read 4283 times)

Offline bryantmorris

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PVG32/120 PVEM Dither Freq and Amp Advice
« on: September 22, 2015, 07:44:22 AM »
Hello,

I am running some PVG32 and PVG120 PVEM amplifiers with a MC050-110. Does anyone have any advice on what I should set the ditherFreq, ReqFreq and ditherAmp variables to for ideal operation? I currently have them set to 0,4000 and 0.

Offline FStelzer

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Re: PVG32/120 PVEM Dither Freq and Amp Advice
« Reply #1 on: September 22, 2015, 09:43:35 AM »
Hello,

if you have set your PinConfig to 6 (PVE Output), there is no need to set or change the ditherFreq or ditherAmp value (so 0 should be ok).
The ReqFreq value of 4000 is also the right one.

Everything should work fine with these settings.

KR,
FStelzer

Offline Marbek_Elektronik

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Re: PVG32/120 PVEM Dither Freq and Amp Advice
« Reply #2 on: September 22, 2015, 12:57:50 PM »
Hi,
it is not allowed to drive PVEM with danfoss controller. They are not compatible with plus+1.
Because may bei the vibrate, because they don't filter the input pwm.
Maybe it works a long time. Maybe it is better to use 4kHz then 1kHz.
But my understanding is, not to do this.
Marbek Elektronik, Dipl.-Ing. Bernd Konrad
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Offline bryantmorris

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Re: PVG32/120 PVEM Dither Freq and Amp Advice
« Reply #3 on: September 22, 2015, 02:21:11 PM »
So who do I believe? The developer or the guru? lol

I was told by Danfoss this would work, I'm hoping it will

Offline Marbek_Elektronik

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Re: PVG32/120 PVEM Dither Freq and Amp Advice
« Reply #4 on: September 22, 2015, 10:45:31 PM »
It's easy, please use the search function ;-)

http://www.plus1forum.danfoss.com/index.php?topic=24.0

From Moderator, Stefan:
"
Hello,
The output from the PLUS+1 controller is a PWM-signal usually 4 kHz. The filter on the input of the PVEM is not able to suppress this frequency enough so is will interfere in the control of the valve.
Stefan
"

PWEMs are old valves designed to connect directly to Joysticks. So they see proportional voltage at the signal pin.

Marbek Elektronik, Dipl.-Ing. Bernd Konrad
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Offline FStelzer

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Re: PVG32/120 PVEM Dither Freq and Amp Advice
« Reply #5 on: September 23, 2015, 11:43:33 AM »
Hello Bryantmorris,

Now I have to agree with Marbek_Elektronik.
It is not possible to control the PVEM with PLUS+1 components because of the reasons Marbek already said.

I don't read the technical Information of the PVE exactly enough.

Have a nice day !

KR,
FStelzer

Offline bryantmorris

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Re: PVG32/120 PVEM Dither Freq and Amp Advice
« Reply #6 on: September 28, 2015, 12:45:45 AM »
So the MC050, even when you select the PVE output on the multi-channel output, is simply a PWM output?

I'm wondering why I bothered learning to use plus+1 when I could of used any other brand of controller with a PWM output now. I was under the impression that the MC050 gave a voltage output when the PVE output configuration was used, hence the need to use a Danfoss controller to run PVG valves.

This is pretty disappointing.
« Last Edit: September 28, 2015, 12:48:09 AM by bryantmorris »