CT Clamp for Loxone DI

[DanF]

Hi,

Anyone used CT clamps that can provide a simple digital input into Loxone?   The use case is simple:   boost MVHR when the hob is in use.

I guess, if CT clamp provided 1-10v output, then that would open up slightly more options, such as only boosting above a theshold. (i.e. not when one ring is on min).

More generally, is there a recommended approaches for monitoring electricity usage via third-party CT clamps that aren't the Loxone "smart socket" or "modbus meter"?

Thanks,

[Simon Still]

Lateral idea - I assume you have a cooker hood as well as a hob (not normally advised to put unfiltered cooking fumes into an MVHR system because of grease). 

Cooker hoods tend to be simpler so more opportunities to 'hack' into the switchgear and use a coupling relay to a Loxone digital connection.  My hood had an open collector connection (intended to open the manufacturers accompanying motorised external vent but works just fine to boost the MVHR as I use it) 

I was looking to connect my hob to both the hood and MVHR but didn't solve that one!

[Daniel Feist]

We'll be using a Bora hob with an integrated/recirculating extractor, so unless I've got some way to hack into the hob (which I doubt it), the best bet I think would be to measure current to the hob.

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[Jonathan Dixon]

Bora are missing a trick by not having any output to say how fast the fan is working, but I can confirm they don't! I have the same goal, as well as MVHR boost I'd like to change the lighting mode when cooking is happening.  "Turning on " the bora may well become our favourite quick hack to turn on full lighting, if stood right by it.

I'm planning to use modbus CT clamps over the spur on the consumer unit, which I'll read via an ESP32 and ESPHome most likely.  

 https://www.aliexpress.com/item/33043137964.html?spm=a2g0s.12269583.0.0.6ab4370a6B1d0s 

I'll use this for PV generation  redirect too.

I see shelly have an energy monitor using CTs  too.

https://shop.shelly.cloud/shelly-em-120a-clamp-wifi-smart-home-automation#141

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[Simon Still]

Looking at the manual for the Pure Bora *do* seem to have some interface options - 

With the Pure Home In module PUHIM, an optional accessory, an interface for external systems is possible. Via this additional interface it is possible to establish a connection to other systems and, for example, a window contact switch or low pressure warning device can be connected. The module is to be integrated in the cooktop.

However, while I can find the installation instructions i can't see any details of what you can actually do with it.  

Really impressed with how neat the Bora unit is though - vaguely looked at the original product when we were building and decided it was too expensive and took too much space in the unit underneath but it probably cost no more than our hob and extractor and the fan unit is much smaller than I expected. 

[Rob_in]

FWIW, we have an Ikea hood and I took it apart and connected a relay (240vac coil) to the fan motor to give a dry contact output when the hood fan is running. Very easy to do.

At the same time I modded the hood lights so they are controlled via a relay (24vdc coil) rather than the switch on the unit.

We have Cat7 cable to the hood location which carries these signal to/from Loxone, which boosts our ERV when it senses the hood fan is on. This is exactly what you want to do, right?

This is good because the lights can now be turned on/off by Loxone (the hood light switch is an input to the lighting controller & relay controlling it's lights is an output) but you don't need a separate switch for the fan because the hood controls still work that.

This all works fine and I didn't think there was any real need for Loxone to control the hood fan. But that said, thinking about it now I really should have just removed the hood control panel altogether and had Loxone control the fan too (there's a KNX switch that is right next to the hob that could have done this). Doh!

Robin

[Pete_C]

Not really a Loxone problem, but something to beware of in this scenario is a fan "arms race". We have a Elica integrated recirculating hob/extractor and I've noticed that the effectiveness of the downdraught can be affected by the level of the MVHR in the ceiling above, so if you boost the MVHR you may then have to boost the extractor to keep the steam going down.  You may find you use the functionality to reduce the MVHR rather than increase it depending on your MVHR extract positions.

Pete

[Simon Still]

Nice.  The benefits of a basic hood with simple mechanical controls.  My Berbel hood has touch controls so, whilst it had a dry contact I could use to boost the MVHR, tapping into the lighting was going to be non-trivial...    I notice that they now have an "automation add on" that, IIRC uses a clamp on the hob power cable to switch on the hood.  Doesn't work with my version of the hood however. 

On Wednesday, 14 April 2021 at 07:49:32 UTC+1 Rob_in wrote:

FWIW, we have an Ikea hood and I took it apart and connected a relay (240vac coil) to the fan motor to give a dry contact output when the hood fan is running. Very easy to do.

At the same time I modded the hood lights so they are controlled via a relay (24vdc coil) rather than the switch on the unit.

Robin