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Program 576 - Cascade: S4 S1 S2 + burner requirement
Program 576: Feed pump A1 runs when:
S1 is greater than the threshold min1 and S1 is greater than S2 by the difference diff1
and S2 has not exceeded the threshold max1.
The feed pump A2 runs when:
S4 is greater than the threshold min2 and S4 is greater than S1 by the difference diff2
and S1 has not exceeded the threshold max2.
Output A3 switches on when S4 falls below threshold min3.
Output
A3 switches off (dominant) when S3 exceeds max3.
A1 = S1 > (S2 + diff1) & S1 > min1 & S2 < max1
A2 = S4 > (S1 + diff2) & S4 > min2 & S1 < max2
A3 (on) = S4 < min3 A3 (off) = S3 > max3
All programs +1:
The burner requirement (A3) only occurs via sensor S4.
A3 (on) = S4 < min3 A3 (off) = S4 > max3 (dominant)
Required settings:
max1 … limit CYL 3 S2 A1
max2 … limit CYL 2 S1 A2
max3 … burner req. off CYL 1 S3 A3
min1 … switch-on temp. CYL 2 S1 A1
min2 … switch-on temp. CYL 1 S4 A2
min3 … burner req. on CYL 1 S4
A3
diff1 … CYL 2 S1 – CYL 3 S2 A1
diff2 … CYL 1 S4 – CYL 2 S1 A2
S4
min2
S1
max2
min1
S2
max1
diff1
A1
diff2
A2
Burner
A3
S4 min3
S3 max3
A1
A3
S3
S4
S1
S2
CYL 1 CYL 2
CYL 3
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