Printable View
Hello, i just got my P4 last week, just stared doing the setup
I am using TECO TK1000, the current setting is Nominal Temp : 25C, Hysteresis: 1C on the TECO. I should put these values into P4, right? What value should I put on the cooling difference in P4? And I should set the Nominal Temp of TECO to something lower than 25C e.g. 24C, am i correct? Thanks for the help.
Hello, I think this will help you
Example for calculating the upper and lower temperature alarm limit
nominal point 26.0 °C
Nightly change by -2 °C active
overall hysteresis 0.2 °C
maximum deviation 1.5 °C cooling difference 2.0 °C
so that means:
Lower limit = 26.0 °C - 2.0 °C -? * 0.2 °C - 1.5 °C = 22.4 °C
Upper limit = 26.0 °C + 5/6 * 0.2 °C + 1.5 °C + 2.0 °C = 27.7 °C
(5/6 due to the upper switching point of the cooling system, see also 3.4 Hysteresis)
regards Pit
Thanks Pit.
As i am not using the Nightly change and also haven't set any alarm yet, so i think the equations should reduce to this:
Lower limit: Nominal -0.5*Hysteresis
Upper limit: Nominal +5/6*Hysteresis + cooling difference
I have set the Nominal 25C, Hysteresis 1C and Cooling difference 0.5C
Lower limit = 24.5C
Upper limit = 26.3C
My P4 will turn on chiller at ~26.4C, but it will turn off the chiller at ~26C.
Am i setting it correctly? Do i miss anything? Please help check. Thanks.
Kary
Hallo Kary
I guess the cooler should be turned on at about 26.3°C and then cool down to ~24.5°C. Do I understand this correctly?
How do you control your Ciller? With a Powerbat? How is this set?
regards Pit
The chiller is connected to Powerbar, and "Function" is set to be Temperature 1 (the temperature probe) and "Sub function" set to Cooler.
The chiller is turned on (by the P4) at 26.4C (25C + 5/6*1 + 0.5 = 26.33C), but it is turned off at ~26C by the P4. It just fluctuate between 26 and 26.4C.
Attachment 9600
Kary