filter doesn't respond to ProfiLux speed changes

[dr.dotti]

Hi Martin,

i think, that you have maybe the same situation like me.

I have al lot of thinks in my Pipe from the Filter to the Tank.
Link CO² Reaktor, Heating, SensorTank, ...

If I try to get on voll Speed my Filter makes only 200l/h put 1000l/h or more is posible with nothing in the Pipe...

[MartinS]

Hi Matthias. Just tried what you suggested. But still nothing happens.

According to the filter LED's there is a problem with the flowrate:

B 1. Adjusted flowrate not possible and / or
2. flowrate smaller than 50%

(B 1. Eingestellte Durchflussmenge nicht möglich und / oder
2. Durchflussmenge kleiner 50%)

I am busy trying to solve this (new) problem. Although the filter is cleaned and all hoses are checked. But the question is: must PLC, despite this problem, nevertheless be able to reduce the flowrate to for instance 1%?
Or putting it a bit different: what would be the normal response of the filter in this case?

The filter is put in automatic mode within a minute when it was first set to manual mode. So the filter does respond on certain commands.
Is there may be a way to check if the Eheimcontroller is working properly?

[Matthias]

the technical limitations of the EHEIM filter define the minimum and maximum flowrates

our controller just sends its "wishes" to the filter

what do you mean with " According to the filter LED's there is a problem with the flowrate"? what are the LEDs displaying exactly?

can you access with the EHEIM-Control Center? what happens there?

[MartinS]

Underneath combination of LED's are lit on my filter:



Accdording to the user manual this errorcode means:
B 1. Adjusted flowrate not possible and / or
2. flowrate smaller than 50%

Besides that, the current flowrate is 281 liter per hour. So I suppose PLC must be able to slow it down to 1%.

I don't have the Eheim control center yet. I thought I don't need it when the Profilux Eheimcontroller is used...

[GHL Support]

The EHEIM filter supports a range from a minimum flow to a maximum flow. The minimum flow (at 1%) does not correspond to 1% of the max. flow.

With ProfiLux we are able to set those flow steps of the filter. 1% correspond to the minimum flow with the EHEIM filter can be achieved.

[MartinS]

That's clear but not an answer to my question. I can't immagine 281 liter per hour as to be 1% = the minumum flowrate of the filter.
So must PLC be able to slow it down to 1% or not?
And is there may be a way to check if the Eheimcontroller is working properly?

[GHL Support]

The 350 model for example supports a flow of 400l/h at minimum.
How should PLC able to slow down the filter beyond the minimum flow?

Normal operation of EHEIM-Controller: the green LED at the EHEIM-Controller is permanent on (Connection to EHEIM filter established) and the yellow LED flashing (EHEIM-Controller gets flow settings from ProfiLux)

[MartinS]

When 400 l/hr is the minimum (=1%?) in a normal situation, of course 281 is lower and difficult to control. Btw, where can be found what the (normal) minimum flowrates are of the Eheim 3e? I have looked up the user manual but could not find this information.
I've measured the actual flow and this compares with the readings. So, first I will try to solve the flowrate problem and see what happens.

[Wirus]

The 350 model for example supports a flow of 400l/h at minimum.

That´s not the whole truth. A flow of 400l/h with minimum speed (2100min-¹) is only possible at free flow - without hoses and also without filter masses (as said in the manual) - same is valid for the 1050l/h at maximum speed of 4320min-¹. You never can reach that in real environment.

In my opinion the possible minimum flow of 400l/h for constant flow is much too hight. Maybe a minimum of 250-300 should be possible to set. But anyway, that´s not a prob of GHL ....

I can't immagine 281 liter per hour as to be 1% = the minimum flow rate of the filter.
So must PLC be able to slow it down to 1% or not?
And is there may be a way to check if the Eheimcontroller is working properly?

Unfortunately the flow will decrease with time - or the pump will speed up more and more with clogging of the filter masses. That depends on programming.
I don´t know if an alarm is set able for going below a minimum flow and/or reaching a maximum speed level (as I see, pump speed is setable from 2100min-¹ up to 4320min-¹ in steps of 60min-¹) due I haven´t get my EHEIM controller yet.

But I have asked Eheim for a pump courve -let´s see if I get it.