controlling a heated fan in my enclouser
-
I am trying to use the Duet Wi-fi board to control a heated fan within my enclosure. The fans are 110v ac so I am using an SSR controlled by a 3-32 VDC signal. I will be using a Pt 100 sensor for the control temperature.
I have connected the SSR to the E1 Heater out put terminals on the board. I believe this is a 24vdc signal. I have connected the Pt-100 to the installed Pt-100 daughter board.
The Pt-100 connection on the bottom, Red and White wire, is for the control sensor for the Hot end. The upper connection, Orange and Blue, Is the control sensor within the enclosure. The idea was to add the E1 control point for the heated fan in the web based controller interface where I control the hot end and bed temperature. in this case the output signal for E1 would trigger the SSR and control the heated fans.
Can this work? Is there a better way?
I find that now it is set up, the controller for E1 gets an error because it expects a change in temperature equal to 1.7 degC persec. Thanks in advance for any help.There is no box!
-
What firmware version are you using?
Do you have a chamber heater as well, or is this just an enclosure temp sensor and a fan?
-
Firm Ware is: 2.02(RTOS) (2018-12-24b1)
It is one control loop a heated fan to heat the enclosure using a Pt 100 to sense the temperature. Thanks for the help.
-
@CarlBosson said in controlling a heated fan in my enclouser:
a heated fan
Perhaps lost in translation, but does this mean a fan with a heating element or just a fan?
-
I am sorry, fan with an element on board as one unit. I bought it from Vision Miner. The Pt-100 is just hanging inside the enclosure.
-
@CarlBosson said in controlling a heated fan in my enclouser:
I find that now it is set up, the controller for E1 gets an error because it expects a change in temperature equal to 1.7 degC persec.
Ok thanks for clearing up the fan/heater confusion. In order to solve the error of not heating up fast enough you will need to do a PID autotuning of the heater so that the firmware can generate a model of the heaters performance. to do this you may need to increase the dead time though.
https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_a_chamber_heater
https://duet3d.dozuki.com/Wiki/Tuning_the_heater_temperature_control
