PID Problem

[MantasJ]

Hello, admin,

Thanks for the response!

What do you mean by kp value too low? As I've mentioned before, I'm trying to achieve (6K/150min) control, which would translate to kp value being 0.16 (1/6K-->0.16), or I'm calculating something wrong?

I've tried putting in kp equal to 1, but all outputs still give out 0. Current temp - 22.5C, setpoint - 23C.

I'm trying to simulate different controls, output isn't connected to valves right now, but I just need some information from trend logs for now.

I also added 1sec delay after each run:

Code:

local P_value = 6
local I_value = 150
local kp_value = 1
local ki_value = 0.0017
local delay = 1

if not P then

P = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_P_Output',
    kp = kp_value,
    ki = 0,
    kd = 0
})

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

PID1 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID1_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.1
})

PID2 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID2_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.2
})

PID3 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID3_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.3
})
  
PID4 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID4_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.4
})

PID5 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID5_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.5
})

PID6 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID6_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.6
})

PID7 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID7_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.7
})

PID8 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID8_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.8
})

PID9 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID9_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 0.9
})

PID10 = PID:init({
    current = 'RTC05_Current_Temperature',
    setpoint = 'RTC05_Setpoint_Temperature_Status',
    output = 'BD_PID10_Output',
    kp = kp_value,
    ki = ki_value,
    kd = 1
})

end

P:run()
os.sleep(delay)
PI:run()
os.sleep(delay)
PID1:run()
os.sleep(delay)
PID2:run()
os.sleep(delay)
PID3:run()
os.sleep(delay)
PID4:run()
os.sleep(delay)
PID5:run()
os.sleep(delay)
PID6:run()
os.sleep(delay)
PID7:run()
os.sleep(delay)
PID8:run()
os.sleep(delay)
PID9:run()
os.sleep(delay)
PID10:run()

---

Update: Okay, so I've set ki to 1 aswell, and now PI and PID controllers give out 11 percent, and add 10 percent every minute, which is way too fast. How do I achieve (6K/150min) control? And why P controller still gives out 0?