fan control with temperature influence on RPM
fan control with temperature influence on RPM
(OP)
Hi
I'm looking for a circuit that can do:
control the fan RPM by the temperature,but with some conditions.
If the temperature is below 40°C then the motor doesn't have to run.
It needs to vary in speed between 30°C and 70°C by RPM
And above 70°C it needs to run at full speed.
The fan needs to run on 230VAC.
Ciruit input should also be 230VAC.
Does someone know where I can find somethimg similar?
I'm looking for a circuit that can do:
control the fan RPM by the temperature,but with some conditions.
If the temperature is below 40°C then the motor doesn't have to run.
It needs to vary in speed between 30°C and 70°C by RPM
And above 70°C it needs to run at full speed.
The fan needs to run on 230VAC.
Ciruit input should also be 230VAC.
Does someone know where I can find somethimg similar?





RE: fan control with temperature influence on RPM
Sounds like you need a temperature sensor/transmitter combination that outputs a 4-20 mA signal over your desired temperature range and a variable speed drive controlled proportionately by that signal. (Some limitations may apply.)
xnuke
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: fan control with temperature influence on RPM
Firstly, I'm sort of assuming the fan is an industrial fan, not a domestic type.
I work for Siemens Building Technologies. We have a VSD/VFD called the SED2 that has a function called Hibernation mode. This operates whilst the drive is working in a closed loop PI(D) loop. Basically, you set a minimum level (and this can be degC)and when the temp drops below this point, the drive stops and awaits until the feedback temperature increases above a pre-determined restart temperature. This is automatic and requires no additional 'stop/start/input. We also have in the SED2 a direct input for a passive temperature sensor (internally we call it the ni1000). The ni1000 has a range between -50C to +150C and can be scaled within the drive. This can be used as your feedback device operating around a fixed (degC) setpoint.
The 230V range is 3-phase 230V in 3-Phase 230V out only though.
You can get info on: http:/
RE: fan control with temperature influence on RPM
=>TYPO needs to be 40°C and 70°
For SED2 I think it will take abit to much room
the space I have is only 10cm high
And the fan is a regular tangential fan.
The purpose is in fact that It's need to be used in a fireplace.It should regulate the amount of air blown into the room depending on the temperature.
So it needs to regulate the fan between 40° and 70°
and above 70° it should turn at full speed.
RE: fan control with temperature influence on RPM
For your application you need to look carefully at the motor on the fan. As you want to vary the speed, you need a motor that is suitable for speed control and a 1-phase 230V motor is not that easy to control. On top of this you need a means of measuring the temperature and feeding back to some sort of controller that will in turn close the loop to your fan/motor. Sounds an expensive process methinks.
RE: fan control with temperature influence on RPM
RE: fan control with temperature influence on RPM
I just need to put it togheter.
I hope that will work.I just hope the thing doesn't get fried if the temp goes up to high.
RE: fan control with temperature influence on RPM
RE: fan control with temperature influence on RPM
For a certain project we do use drive controls.
And now I'am looking for a solution for controlling a motor through the PC.
For that project we have aour own program but is it possible to control the motor from our program.
Because I guess siemens will a have a program for conrtolling it.
RE: fan control with temperature influence on RPM
RE: fan control with temperature influence on RPM
The program is written in C++.For the rest the program just collects data from a Daq card.
RE: fan control with temperature influence on RPM