Signal conditioner to translate/scale 0-10V signal? - Page 1
Forum section: electronics / projects

author: ddbear
author_rank: Contributor
timestamp: May 18, 2022, 12:38:08 am
content: I'm having fun with the new automation possibilities as I figure out a design for replacing my Miele kitchen fan with an inline Fantech 0-10VDC speed controllable fan. I'm adapting the Miele exhaust hood button control panel with a bunch of DIN rail mounted relays to correspond to different 0-10V fan speeds depending which 120V wire is activated by the Miele controller. Then I realized that I can have the inline fan turn on automatically if I use a current sensor relay on the cooktop circuit. Now I'm taking the thinking a step further, as I discovered the Eaton CurrentWatch EAC Series current sensors can output a 0-10VDC signal -- I can have the fan speed vary according to the induction cooktop power setting. However, the 0-10V signal on the current sensor probably won't line up exactly with the optimal fan speeds for a given cooktop temp, unless I get lucky with the settings out of the box. So I'll probably need a DIN rail signal conditioner that would allow me to take the current sensor signal and translate that to the desired range and scale for the 0-10V. For example, if the current sensor gives me 3-6V corresponding to cooktop amperage where things boil and fry where the exhaust fan is needed, I might want that to translate to 4-10V for the fan speed. Is there a DIN rail signal conditioner product that would allow this kind of adjustment translation of the signal? I found a lot of these products in a search but I'm overwhelmed by the possibilities. Here is the datasheet on the current sensor:https://www.eaton.com/content/dam/eaton/products/industrialcontrols-drives-automation-sensors/currentwatch/currentwatch-eac-and-eacr-series-p51917.pdf

author: james_s
author_rank: Super Contributor
timestamp: May 18, 2022, 12:43:00 am
content: I would just build something, at a glance that sounds like a very basic op-amp circuit. No idea if an off the shelf DIN rail device exists, I wonder if someone sells DIN rail project enclosures?

author: ledtester
author_rank: Super Contributor
timestamp: May 18, 2022, 01:01:27 am
content: I think I would first try using a microcontroller. It would allow for quick testing of different translation curves.You can get DIN rail mounts for Arduinos, e.g.:https://www.amazon.com/DIN-Rail-Mount-Arduino-Mega/dp/B01MUBRAXGhttps://thepihut.com/products/arduibox-open-standard-prototyping-din-rail-arduino-caseThis first one looks rather simple and could be used for any PCB that used the same mounting holes.

author: ddbear
author_rank: Contributor
timestamp: May 18, 2022, 09:09:24 am
content: I found two candidates so far,Status SEM1600VI"ADVANCED MODE An advanced configuration mode, giving the user access to programming options such as rootfunctions. A 22-segment user non linearisation profiling tool is also available for applications where the input to outputsignal is not a “straight line” relationship. This can be used to create input to output curves, and also to control outputsignal behaviour, when the input signal is outside limits."https://www.status.co.uk/wp-content/uploads/2019/03/D2535-01-08-CN5710-SEM1600VI-Data-Sheet.pdfandPepperl+Fuchs KF**-USC-1.Dhttps://files.pepperl-fuchs.com/webcat/navi/productInfo/doct/tdoct0969c_eng.pdf?v=20200320004814

author: ddbear
author_rank: Contributor
timestamp: May 18, 2022, 11:19:35 pm
content: I ended up getting the Pepperl+Fuchs KFD2-USC-1.D K-System Signal Conditioner because it doesn't rely on a micro USB 2.0 port that will become totally obsolete 10 years from now (has built-in display for programming) and it has a built-in relay trigger which will simplify the rest of the circuit design.I'm starting to really like the DIN format. It is good for modular projects that don't need to be mass-produced, or miniature, or low cost. Perfect for industrial automation (I consider the Miele kitchen fan to be industrial automation).

author: james_s
author_rank: Super Contributor
timestamp: May 19, 2022, 05:38:12 pm
content: I doubt micro USB will go anywhere in the foreseeable future, USB 1.0 came out more than 20 years ago and it will still work in a state of the art USB-C port with an adapter.