experience with the OTGW from NODO-shop?

For OpenTherm-gateway related questions in Domoticz
Hobbybob
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Re: experience with the OTGW from NODO-shop?

Post by Hobbybob » Friday 06 July 2018 18:28

skippy711 wrote:
Thursday 05 July 2018 22:08
Hi
I installed this in March (when it was cold) and it I experienced frequent dropouts. I suspected it had to do with overheating. My (crude) solution: an old fashioned timer in the wall socket which turns off the OTGW every 4 hours for 15 minutes. This solved the problem, although the you will see error messages in the log...
Skippy
Although my problem does only exist when the OTGW has been running for some time (which would indicate a heating-problem I thought), I do find it strange that OTMonitor can read it perfectly, while Domoticz cannot read or control it at all after about one hour or so...

Too bad, I was really looking forward to being able to control the thermostat with Domoticz, but it looks like it is not going to work.

skippy711
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Re: experience with the OTGW from NODO-shop?

Post by skippy711 » Friday 06 July 2018 20:41

My (not so elegant) solution works. I can control the thermostat. I did so in April, just make sure you increase the setpoint 1 whole degree or more, won't accept 0,5 degree.

Skippy

Hobbybob
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Re: experience with the OTGW from NODO-shop?

Post by Hobbybob » Friday 06 July 2018 21:19

Yes, I also noticed about the half degree setpoint-change when I turned it on the first time. That is fine by me however, I don't mind that.

But I don't think turning it off every hour for 15 minutes (because after an hour it wil not work anymore, after half an hour it already starts to malfunction on and off) does not make for a useful OTGW, because that would mean that it be off or malfunctioning for about 50% of the time.

skippy711
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Re: experience with the OTGW from NODO-shop?

Post by skippy711 » Saturday 07 July 2018 9:58

I checked again the exact interval I set in the timer: I started with every 2 hours, then stretched to 3 hours and now it's 4. Originally I planned to go to 5 or 6 hours, but forgot. I do agree it's far from ideal, but for me it works.

Ron
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Re: experience with the OTGW from NODO-shop?

Post by Ron » Sunday 08 July 2018 14:00

Yesterday i modified the OTGW and casing.
First i soldered a heatsink directly on the L7805 voltage regulator, as this is the component which get way to hot.
Secondly i drilled som extra holes directly above the mounted heatsink, next to the already drilled holes i made.
At third i dropped the power supply voltage from 24V DC to 19V DC.

As discribed on the PCB the input should be between 19 and 24V but this voltage goes directly to the L7805 regulator.
The output of the L7805 is 5V DC, thus the energy dissipation of the regulator should be approx. (24V-5V) * A.
When dropping the input voltage to 19V the energy dissipation should be (19V-5V) * A
V = Voltage
A = Amperage
So in this case the regulator has to dissipate less energy, and with the extra heatsink it should work a lot better.
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Last edited by Ron on Sunday 08 July 2018 14:03, edited 1 time in total.

Ron
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Re: experience with the OTGW from NODO-shop?

Post by Ron » Sunday 08 July 2018 14:02

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Ron
Posts: 129
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Re: experience with the OTGW from NODO-shop?

Post by Ron » Monday 09 July 2018 9:02

The gateway is more stable now with the new changes.

Just looked at the Nodo shop and it is clearly to see that the voltage regulator has been changed now to a step down converter.
My conclusions were right, otherwise they didn't have to change this.

Than i did some more research, and found this:
https://www.domoticaforum.eu/viewtopic. ... d985ca45a7

Some problem, same conclusion...
Without wifi add on the voltage regulator should work fine, but with wifi add there is more power dissipation on the voltage regulator.
The only way to improve this is to drop down the voltage and apply some kind of heatsink like i did.

(other solution, buy the new version of this kit)

The new version:
OTGW.jpg
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matthew73210
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Re: experience with the OTGW from NODO-shop?

Post by matthew73210 » Tuesday 28 August 2018 20:01

Hey all,

I happen to have the infamous OTGW from NODO-shop, all works well, otmonitor etc..

I can send commands via the hardware tab; CS=x works fine and the boiler starts up. Ps=1 updates most of the values.

The problem is with the control setpoint device in the temp tab, if I edit that value it does not get reflected back to the OTGW.
Nor does the CS command get updated to the control setpoint device.

Any ideas?

Here's a log :

Code: Select all

2018-08-28 19:55:21.689 (Boiler) Temp (Control Setpoint)
2018-08-28 19:55:21.692 (Boiler) Thermostat (Room Setpoint)
2018-08-28 19:55:21.693 (Boiler) General/Percentage (Relative modulation level)
2018-08-28 19:55:21.694 (Boiler) Temp (Room Temperature)
2018-08-28 19:55:21.695 (Boiler) Temp (Boiler Water Temperature)
2018-08-28 19:55:21.696 (Boiler) Temp (DHW Temperature)
2018-08-28 19:55:21.697 (Boiler) Temp (Outside Temperature)
2018-08-28 19:55:21.698 (Boiler) Temp (Return Water Temperature)
2018-08-28 19:55:21.699 (Boiler) Thermostat (DHW Setpoint)
2018-08-28 19:55:21.700 (Boiler) Thermostat (Max_CH Water Setpoint)
2018-08-28 19:55:51.702 (Boiler) Temp (Control Setpoint)
2018-08-28 19:55:51.704 (Boiler) Thermostat (Room Setpoint)
2018-08-28 19:55:51.704 (Boiler) General/Percentage (Relative modulation level)
2018-08-28 19:55:51.705 (Boiler) Temp (Room Temperature)
2018-08-28 19:55:51.706 (Boiler) Temp (Boiler Water Temperature)
2018-08-28 19:55:51.706 (Boiler) Temp (DHW Temperature)
2018-08-28 19:55:51.706 (Boiler) Temp (Outside Temperature)
2018-08-28 19:55:51.707 (Boiler) Temp (Return Water Temperature)
2018-08-28 19:55:51.708 (Boiler) Thermostat (DHW Setpoint)
2018-08-28 19:55:51.709 (Boiler) Thermostat (Max_CH Water Setpoint)
2018-08-28 19:56:21.716 (Boiler) Temp (Control Setpoint)
2018-08-28 19:56:21.718 (Boiler) Thermostat (Room Setpoint)
2018-08-28 19:56:21.719 (Boiler) General/Percentage (Relative modulation level)
2018-08-28 19:56:21.719 (Boiler) Temp (Room Temperature)
2018-08-28 19:56:21.720 (Boiler) Temp (Boiler Water Temperature)
2018-08-28 19:56:21.720 (Boiler) Temp (DHW Temperature)
2018-08-28 19:56:21.720 (Boiler) Temp (Outside Temperature)
2018-08-28 19:56:21.721 (Boiler) Temp (Return Water Temperature)
2018-08-28 19:56:21.721 (Boiler) Thermostat (DHW Setpoint)
2018-08-28 19:56:21.722 (Boiler) Thermostat (Max_CH Water Setpoint)
2018-08-28 19:57:21.738 (Boiler) Temp (Control Setpoint)
2018-08-28 19:57:21.739 (Boiler) Thermostat (Room Setpoint)
2018-08-28 19:57:21.740 (Boiler) General/Percentage (Relative modulation level)
2018-08-28 19:57:21.740 (Boiler) Temp (Room Temperature)
2018-08-28 19:57:21.741 (Boiler) Temp (Boiler Water Temperature)
2018-08-28 19:57:21.741 (Boiler) Temp (DHW Temperature)
2018-08-28 19:57:21.742 (Boiler) Temp (Outside Temperature)
2018-08-28 19:57:21.743 (Boiler) Temp (Return Water Temperature)
2018-08-28 19:57:21.743 (Boiler) Thermostat (DHW Setpoint)
2018-08-28 19:57:21.744 (Boiler) Thermostat (Max_CH Water Setpoint)
2018-08-28 19:57:51.751 (Boiler) Temp (Control Setpoint)
2018-08-28 19:57:51.752 (Boiler) Thermostat (Room Setpoint)
2018-08-28 19:57:51.754 (Boiler) General/Percentage (Relative modulation level)
2018-08-28 19:57:51.754 (Boiler) Temp (Room Temperature)
2018-08-28 19:57:51.756 (Boiler) Temp (Boiler Water Temperature)
2018-08-28 19:57:51.757 (Boiler) Temp (DHW Temperature)
2018-08-28 19:57:51.757 (Boiler) Temp (Outside Temperature)
2018-08-28 19:57:51.759 (Boiler) Temp (Return Water Temperature)
2018-08-28 19:57:51.759 (Boiler) Thermostat (DHW Setpoint)
2018-08-28 19:57:51.760 (Boiler) Thermostat (Max_CH Water Setpoint)
2018-08-28 19:58:05.466 Status: User: matt73210 initiated a manual command: CS=15
2018-08-28 19:58:05.755 Status: OTGW: CS: 15.00
2018-08-28 19:58:20.888 Status: User: matt73210 initiated a manual command: PS=1
2018-08-28 19:58:50.145 Status: EventSystem: reset all device statuses...
2018-08-28 19:58:51.772 (Boiler) Temp (Control Setpoint)
2018-08-28 19:58:51.773 (Boiler) Thermostat (Room Setpoint)
2018-08-28 19:58:51.775 (Boiler) General/Percentage (Relative modulation level)
2018-08-28 19:58:51.775 (Boiler) Temp (Room Temperature)
2018-08-28 19:58:51.776 (Boiler) Temp (Boiler Water Temperature)
2018-08-28 19:58:51.776 (Boiler) Temp (DHW Temperature)
2018-08-28 19:58:51.776 (Boiler) Temp (Outside Temperature)
2018-08-28 19:58:51.777 (Boiler) Temp (Return Water Temperature)
2018-08-28 19:58:51.777 (Boiler) Thermostat (DHW Setpoint)
2018-08-28 19:58:51.778 (Boiler) Thermostat (Max_CH Water Setpoint)
As you can see it sends the command and the controller replies, and PS=1 does its magic. Although i'd rather use the PS=0 and decode the data as it comes in.

Any ideas ?

Matthew

Ron
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Re: experience with the OTGW from NODO-shop?

Post by Ron » Wednesday 29 August 2018 20:19

I returned the OTGW to the Nodo shop and they replaced the voltage regulator.
Now i have the new version, and i expect it will work as it should.

As we just bought a new (beatiful old) house, i cannot test the gateway while the Nefit Excellent heating has no OT connection.
When i have time enough i will install a converter for that, and hopefully it wil work again.

matthew73210
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Re: experience with the OTGW from NODO-shop?

Post by matthew73210 » Friday 31 August 2018 10:26

Hey,

That is good news, silly of them to use a linear voltage regulator. When I got my one it already came with the buck converter. Although if I was them I would have gone with a forward converter as it's more efficient.

May I ask, where is this newly old house?

Do you think I should move my "help request" to a new sub? As it is only partly linked to the nodo_otgw!

Cheers,

Matthew

Ron
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Re: experience with the OTGW from NODO-shop?

Post by Ron » Friday 31 August 2018 10:43

Our new house is in the northern region of Den Bosch, Bokhoven.

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