Thermolec Application &Technical Notes Instrukcja Użytkownika Pobierz pdf (Strona 31)

STEP 3 - (continued)

Since the SCR step is kept relativ

ely small (53.3 Kw

), it is still cost effectiv

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

0 V

Q1Q1

Load

Total Load

SCR Output Q5

Relay ON / OFF

Sequential Outputs

The SCR Output

fills the gap between

the fixed steps

Control Signal Input

/16

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

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Thermolec Application &Technical Notes Instrukcja Użytkownika Strona 31