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App. - 32
Operation explanation
(1) The pressure switches (X2, X3, and X4) are initially off. In this state, turning on
the start switch (X0) activates the three compressors all together, and when
sufficient pressure is obtained (X2, X3, and X4 turn on), the three compressors
stop. This is the basic operation of this system.
If all the compressors are at stop with sufficient pressure or the pressure
shortage "Minor" is detected (X4 turns off), one compressor is activated to
supply pressure until sufficient pressure is obtained.
The compressor activated at this time activates in order from A to C each time
compressors are reactivated in reaction to pressure shortage.
Note that the stop switch (X1) is available for stopping compressors at any time.
(2) If one compressor does not supply sufficient pressure and the pressure
shortage level goes up to "Medium" (X3 turns off), the second compressor is
activated to support the first compressor. This second compressor will be
compressor C if compressor A has been in operation, A if B has been in
operation, and B if C has been in operation.
(3) If two compressors do not supply sufficient pressure and pressure shortage
level goes up to "Major" (X2 turns off), the last compressor is also activated.
When only one compressor is in operation and pressure shortage level goes
from "Minor" to "Major" directly, the rest two compressors are activated
simultaneously.
(4) When two or three compressors are in operation, they continue operating
together until sufficient pressure is obtained. Then they stop together when
sufficient pressure is obtained (X4 turns on).
Start - (X0)
PX3 - (X4)
Pressure switch PX2 - (X3)
PX1 - (X2)
A - (Y70)
Compressor B - (Y71)
C - (Y72)
Pressure shortage
Compressor
A,B,C
Major
B
Minor
C
Minor
A,C
Medium
A,B,C
Major
A
Minor
B
Minor
C
Minor
A,C
Medium
Timing chart