2/11/2020 6:59 PM | |
Posts: 3 Rating: (0) |
Hello I need help with LOGO PI controller settings. I have a drying chamber which work space capacity is 2 m3. I need to heat that chamber from room tomperature (20-25°C) to 55°C in less than 10 minutes. There is a fan inside the chamber which blows air trough the heater and does recirculation. The fan speed is constant. Heater power is 9 kW and I use solid state relays to regulate the power (PWM). The temperature and humidity sensor (all in one) is placed inside the chamber. It measures temperature from 0-80°C and it has output from 0-10V (transmitter). My problem is that I have too large overshot and undershot. I'm not shure how to correctly set up the PI controller. Usually the temperature goes from 50-60°C (SP is 55°C). The best I get is +/- 3 °C. The part of my program which is in charge for heating is in the attachment.
AttachmentPI PWM Heating.zip (224 Downloads) |
2/11/2020 11:17 PM | |
Posts: 3 Rating: (0) |
Thank you! 1. I use: - 12/24RCEO base - 6ED1052-2MD08-0BA0 - DM 8/24 expansion module (for PWM output) - 6ED1055-1CB00-0BA 2. Temperature/humidity sensor is S+S -RPFTF-U The probe is quite tick, maybe that is the problem? |
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