Three easy steps, Step 3 - (continued) – Thermolec Application &Technical Notes User Manual
Page 33
THREE EASY STEPS
STEP 3 - (continued)
In the following graphic, the binary loads are switched ON and OFF to match the heat demand.
Lay a straightedge vertically at any position of the control input voltage and find exactly which stages
are ON or OFF. The SCR modulating step fills the gap between the fixed steps at all times.
Hybrid Binary Load Diagram
Q4
Q3
Q3
Q2
Q2
Q2
Q2
Q1
10 V
7.5 V
5 V
2.5 V
0 V
Q1
Q1
Q1
Q1
Load
Total Load
Q4
Q3
Q2
Q1
SCR Output Q5
Relay ON / OFF Binary Outputs
The SCR Output
fills the gap between
the fixed steps
Control Signal Input
Q1
Q1
Q1
2
/
16
4
/
16
6
/
16
8
/
16
10
/
16
12
/
16
14
/
16
16
/
16
1
0
1
0
1
0
1
0