What load are they driving? If it's inductive (motor, relay, etc.), then you will need a varistor across the contacts, or a snubber across the load. I've had lots of problems with Shelly driving even small inductive loads, and varistors across the contacts have been the solution every time. Others have reported success with snubbers, too.
Beiträge von N20net
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I have a Shelly Pro 4PM installed at a client's site. This unit generates frequent (a few times a day) overpower consumption alerts. Even when switched off.
Additionally, the name of the device generating the alert is a hexadecimal string, and doesn't correspond to any of the names configured on the system. The alerts are:
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Shelly Cloud - Overpower consumption detected by 84xxxxxxxx80!
84xxxxxxxx80 detected overpower consumption and turned off!
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These are very annoying, as they make my client's phones beep and buzz, often waking them up. They're not happy with me!
Does anyone have any ideas?
Thanks for reading.
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Yes
Thank you for the confirmation. I'd recommend adding MOVs or snubbers, anyway. At worst, this should prolong the working life of the Shelly internal relay.
Also, I would recommend an extended test, using the auto-on and auto-off timers, with a 1s or so duration for each, to confirm no crashing.
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Thanks for the update. I am a little confused, though. Are you saying that the Shelly 4 Pro was ok driving contactors, without any other suppression components?
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Hello jenne72 ,
Please accept my apologies for replying in English. I had lots of problems switching inductive loads with the Shelly Pro 4 PM. I solved it with a MOV across the Shelly output contacts. There is more detail in this thread:
Note that what I thought was a snubber was actually an MOV. However, other users reported that a snubber, across the relay coil, also works. I haven't tried this, yet.
I really hope this is helpful. I love the Shelly devices, but their handling of inductive loads is not good, without further measures like MOVs or snubbers being added.
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Connecting one channel of the Pro 4PM to a 3 phase + N contactor will allow you to switch 3 phase. If you need power measurement, a 3 EM will do that. Although I think the 3 EM isn't Ethernet connected, which is a shame.
Having said that, I agree that it is somewhat disappointing that the Pro 4 PM contacts are not dry/zero volt. It would make it so much more flexible. To also allow power measurement, something like this (or a cheaper option) inside the Shelly would solve the problem of isolation:
https://docs.broadcom.com/doc/ACHS-7124-7125-DS -
Thank you for that. It looks very interesting. I think I might be able to find a way to use that to do what I need.
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Sorry - Not an answer...
This would be very interesting for me, too. I have been wondering if I can use a Shelly Pro 4PM as a central heating controller (three heating zones, plus one for hot water). I would like to be able to set a schedule, which runs as normal, but also have a function where I can press a button on a particular channel to provide a 1 hour 'boost'. Ideally, multiple presses would increase the boost time in 1 hour increments. But, in the first instance, just a 1 hour auto off would be fine.
So, I'm hoping someone answers, in the affirmative.
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Hello,
I manage Shelly devices at a number of sites. I tried to connect to one about 15 minutes ago (19:45 GMT). It reported offline. I then tried all my other sites, and they all reported offline.
Things are back up now, but I'm wondering if the problem was at the Shelly Cloud end, or something else, that I need to look into.
Edit:
I checked again, just now (20:02 GMT). All reporting offline again.
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Hello. The subject says it all, really. For some applications it would be more useful for me to see the current, rather than the power, in the app. Can this be done?
Thank you for reading.
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As the inductive load causes back emf to spark across the contacts on each channel, I needed to fit an MOV to each channel driving a coil (one was the Finder relay, mentioned above, and the other was the contactor). Without the MOV in circuit, the crash happened at least 25% of the time.
I can't see that the snubber would be any different. Any channel driving an inductive load will almost certainly need one.
And, it seems that the Shelly Pro 4PM isn't the only device with this issue. This thread, about the Shelly 1PM, is very similar. Which isn't surprising, as I imagine the hardware is also very similar:
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Could you swap the SSR and the Shelly, feeding the SSR from the O of the Shelly? Then the Shelly will be powered all the time.
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You need to take your mains supply for the charger from O on the Shelly 1PM. This will then measure the power correctly.
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Hello. I had terrible problems with a Shelly Pro 4PM, when switching off (and only off - it's called 'back-emf') even a small inductive load (a small 230V relay).
Please see my thread in the Shelly Pro 4PM section for details:
The solution for me was to connect a suitable MOV (Metal Oxide Varistor) across the Shelly relay contacts.
An alternative, that I didn't try, but another poster did, successfully, was a Shelly 'Snubber' across the load.
Hope that this is helpful.
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Is it a split load consumer unit? Have you used the correct N?
If you connect just a load (lamp, or any other suitable electric load) to the supply (without the Shelly connected to anything) does it work ok?
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I wasn't aware that the switch needed to be a standard domestic installation type.
However, if that is what's needed, it's trivial to drill a 20mm hole in a blanking plate. Crimping on lugs for the terminals is also not a big deal.
It was intended as a suggestion as to a potential solution for general, similar, situations where someone might want a manual override for a Shelly (or other controller). The OPs plan to wire a switch in parallel with the Shelly contact wouldn't allow the load to be switched off if the Shelly was stuck on.
And, if the heater is 120V, the current is about 8.5A. Well within the Shelly relay specs, of course, but getting up to where I would consider an auxiliary relay/contactor. But, I am risk averse, and prefer my installations to be as robust as possible.
Edit - Here's a solution. No lugs. 20A rated:
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I'm a bit confused. The specs for the switch I posted show it's rated to 250V@6A, or 125V@10A.
It won't do 16A, but I wouldn't use a Shelly for a 16A load, either. That's why I suggested a contactor for heavy loads. Then the switch is passing only the coil current.
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Thank you! I found it. I wasn't aware that the beta is the preferred software. With most other manufaturers the 'official' release is the stable software, and I generally stick with that for anything I set up for customers.
So, is it the case that the beta is the one that should be used for everything, including my end users?
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Thank you for your reply. I am using the Shelly app, as I am not at the site, so not on the LAN to directly access the web interface of the device.
Maybe the app doesn't expose these settings?
But!.. Oddly, remote access to a Shelly 1 PM does give me this option (under 'Safety'):
Der Inhalt kann nicht angezeigt werden, da Sie keine Berechtigung haben, diesen Inhalt zu sehen. That's from a Shelly 1PM at a different site. The Shelly Pro 4PM gives this (several missing options):
Der Inhalt kann nicht angezeigt werden, da Sie keine Berechtigung haben, diesen Inhalt zu sehen. Going into 'Settings' allows only editing the name, picture, etc.
There certainly appears to be a difference.
Thank you for reading.
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Hello,
Apologies for replying in English. I have done this, in a slightly different way. I used a three position SPDT switch, with a centre off feature (also called on/off/on) The pole is connected to the load, one switch terminal to L, and the other switch terminal to the Shelly output. With this configuration I can have any of:
1. Manually switched on.
2 Manually switched off (switch in centre position).
3. Auto, under Shelly control.
The switch I like is this:
https://www.switchelectronics.co.uk/on-off-on-roun…switch-dpdt-10a
(It's DPDT, but you can just ignore the other half.)
I like it because it fits in a 20mm diameter round hole. Much easier than creating square holes!
The Bulgin R13 range is similar. Better, in fact:
If the load is heavy, then I use a relay/contactor, with the pole connected to the coil, instead of the load. However, in this configuration, you lose the power measurement, as the Shelly is then only providing power to the relay/contactor coil.
I hope this is helpful.
