Instruction Manual

STEP 3 - (continued)
Since the SCR step is kept relativ
ely small (53.3 Kw
), it is still cost effectiv
e
compared to a full SCR 160 KW.
In the following graphic, the sequential loads are switched ON and OFF to match the heat demand.
Lay a str
aightedge v
ertically at an
y position of the control input voltage and find e
xactly which stages are
ON or OFF. The SCR not only fill the gaps but overlaps the gaps between the fixed steps at all times.
Hybrid Sequential Load Diagram
THREE EASY STEPS
Q4
Q3
Q2
0 V
Q1
Q3
Q2
Q1
Q2
Q1Q1
Load
Total Load
Q4
Q3
Q2
Q1
SCR Output Q5
Relay ON / OFF
Sequential Outputs
The SCR Output
fills the gap between
the fixed steps
Control Signal Input
2
/16
4
/16
6
/16
8
/16
10
/16
12
/16
14
/16
16
/16
1
0
1
0
1
0
1
0
1.25 V
2.5 V
3.75 V 4.38 V
5 V
6.25 V
7.5 V
8.13 V 8.75 V
10 V