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App. - 34
After the basic operation, one compressor is activated in reaction to pressure
shortage detected. To use the three compressors equally, they are activated
according to the set order. This control is enabled by the 3-stage ring counter
(ring-shaped shift registers) M10 to M12.
A shift signal is generated when pressure shortage is detected (X04 switches from
on to off).
SET
RST
M9
X0, Start
X1, Stop
X4, (PX3)
OFF
M10
M11 M12
ABC
Compressor
X4
M10
M11
M12
Shift operation