WaveEngine and Varios2 question

[dsmitchell]

Question for anyone who is powering a Varios2 through the WaveEngine: When I use the 0-10v to ramp up the Varios2 with its native controller from 0% to 15%, there’s a point where the controller actually revs up the pump to something like 25-30% (maybe even higher) before it falls back to the desired 15%.

Does the WaveEngine cause this same behavior when ramping the Varios2 up from 0%, or can I achieve a smooth slow ramp from 0% to 15, 30, or even 50%?

The reason why I’m asking is because I’m using the Varios2 to power a biopellet reactor and this jolt pushes the pellets all the way to the top of the reactor, and the lower final flow is not enough to allow the pellets to fall back down.

Thanks in advance.

 

[dsmitchell]

No one has an answer? All I need to know is whether the WaveEngine can create a smooth ramp up from 0% for a Varios2.

The in-the-box Varios2 controller currently revs it up like its a Mustang or something. If the WaveEngine can ramp up smoothly like my Vectra S2, then I’ve got money to give away

Thanks

 

[JeffB418]

@Carlos do you have the answer to this? I don’t have exp with varios yet.

 

[Carlos]

Yes, the WaveEngine can control the VarioS-2 water pump either by direct drive or 0-10V.

 

[JeffB418]

Yes, the WaveEngine can control the VarioS-2 water pump either by direct drive or 0-10V.

He was asking if the direct drive does a smoother ramp up than the native varios 2 controller. Does the wave engine slowly ramp up to 15% or does it overshoot 15% like he is seeing with the native controller? Maybe @Don would know.

 

[Shred5]

How are you seeing the ramp up to 30 percent?

I have several controlled different ways and never noticed this.
I am not doubting you I just have never noticed it.

 

[Carlos]

0-10V is limited when it comes to the end of the range. No pump out there will go down to 1% speed using 0-10V. At one point or another, the pump will stop working once closer to the end of the range. The actual speed where a pump stops working depends on the pump itself. Some pumps will be able to go as low as 15% before they stop, and some pumps will not go down below 25% and continue to run reliably. That is the only limitation with a 0-10V connection.

Now, on the Drive Port, the Waveengine has already set limits of how low a pump can go before it stops working reliably, and those limits are hardcoded to the WaveEngine already. So if the app only allows you to go down to a minimum of 15%, then that is as low as the pump will run before it becomes unstable.

 

[dsmitchell]

If I can attach a video I will do so later. But here is what I’m seeing using a 0-10v:

1) Varios2 does not actually function unless the % is 8 or higher (which is fine — totally get it)
2) If I ramp from 0% to 10%, I see the pump slowly push water for 1-2 seconds before a huge Muscle Car rev up to ~40% before settling down to 10%
3) If I ramp from 0% to 30%, same thing: I see the the pump slowly push water for 1-2 seconds before the rev up to ~40% before settling down to 30%

My desired outcome when going from OFF->ON is smoothly build to 35%, actually. But 1-2 seconds into that smooth build I get a rev to something large. I get the feeling the native Varios2 controller is responsible (regardless if it is on 0-10v or even set to 1 dot i.e. 20%). I just need it not to do that, and would gladly get a WaveEngine to power both my Varios2 pumps if that’s the case.

Thanks again.

 

[dsmitchell]

My current ”workaround” is to place my thumb on the output of the reactor fed by the Varios2 for a few seconds until that rev-up is finished and I’m back down to the desired flow.

 

[dsmitchell]

Here’s a short video. The final value is 35%