Endress+Hauser Liquiline System CA80HA, Operating Instructions Manual

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Liquiline System CA80HA Operation
Hauser 123
Example 1: Time-based set point for a temperature controller
The temperature should increase to 21 °C from 08:00 every day, and then to 23 °C for 5 hours
from 12:00. The temperature should be controlled to fall back down to 18 °C from 17.00. Two
time switches are defined for this purpose which are used in a MF1: Formula mathematical
function. Using the mathematical function, an analog temperature set point is thus available
for a controller.
T
[° C]
t [h]
18
21
23
8
12 17
0
T2
T1
A0041704
 69 Time-based temperature control
1. Program Time switch 1 (T1):
• Start date = 01.01.2020
• Start time = 08:00:00
• Signal duration = 09:00:00
• Period = 24:00:00
2. Define Time switch 2 (T2):
• Start date = 01.01.2020
• Start time = 12:00:00
• Signal duration = 05:00:00
• Period = 24:00:00
3. Create Formula mathematical function.
Menu / Setup / Additional functions / Mathematical functions
• MF1: Formula
• Tracking = On
• Source A = Time switch 1
• Source B = Time switch 2
• Formula = 18.0 + 3*NUM(A) + 2*NUM(B)