PID Problem

[MantasJ]

Hello guys,

I'm trying to create a PID controller. I need to have 12 controllers - 1 P, 1 PI and 10 PID with D gain values ranging from 0.1 to 1. P and PI controllers has to have P gain according to 6K, and PI controller I gain has to be according to 150min, so (6K/150min). Here is my script:

Code:

local P_value     =     6
local I_value     =     150
local kp     =     1/P_value
local ki    =     (kp/(I_value*60))*100

if not P then
 
P = PID:init({
    current         =     'RTC05_Current_Temperature',
    setpoint         =     'RTC05_Setpoint_Temperature_Status',
    output             =     'BD_P_Output',
    kp                     =     kp,
    ki                     =     0,
    kd                     =     0
})
 
end

P:run()

if not PI then

PI = PID:init({
    current         =     'RTC05_Current_Temperature',
    setpoint         =     'RTC05_Setpoint_Temperature_Status',
    output             =     'BD_PI_Output',
    kp                     =     kp,
    ki                     =     ki,
    kd                     =     0
})
 
end

PI:run()

if not PID then
 
for i = 1, 10, 1 do
 
PID = PID:init({
    current         =     'RTC05_Current_Temperature',
    setpoint         =     'RTC05_Setpoint_Temperature_Status',
    output             =     'BD_PID' .. i .. '_Output',
    kp                     =     kp,
    ki                     =     ki,
    kd                     =     0.1 * i
})

PID:run() 
   
end
 
end

What I end up getting on P and PI controller outputs is 0, and on PID outputs I don't get anything with current setpoint being 24C while current temperature is 22.5C, so it's not correct. My resident script sleep time is 10sec, I have added PID algorithm in library so the problem is not coming from there. What is going on here? What am I missing?