2.6
CONTROL SYSTEM,
FUNCTIONAL DESCRIPTION
Refer to Figure 2-5 and Figure 2-6. The purpose of the
compressor control system is to regulate the amount of air
being compressed to match the amount of compressed air
being used. The capacity control system consists of a
solenoid valve, regulator valve and an inlet valve. The
functional description of the control system is described
below in four distinct phases of operation. For explanatory
purposes, this description will apply to a compressor with
an operating range of 100 to 110 psig
(6.9 to 7.6 bar). A
compressor with any other pressure range would operate
in the same manner except stated pressures.
Start Mode - 0 to 50 PSIG
(0 to 3.5 Bar)
When the compressor " " (START) pad is depressed,
the receiver tank pressure will quickly rise from 0 to 50 psig
(0 - 3.4 bar). The compressor initially starts unloaded with
the solenoid valve open and the inlet valve closed. It then
switches to full load when full rpm has been achieved.
During this period, both the pressure regulator and the
solenoid valve are closed, the inlet valve is fully open and
the compressor pumps at full rated capacity. The rising
compressor air pressure is isolated from the service line
in this phase by the minimum pressure valve set at
approximately 50 psig (3.4 bar).
7
6
5
4
8
2
3
1
SU_0000007
9
1. Air Outlet
2. Unload Solenoid Valve
3. Pressure Regulator
4. Air Inlet
5. Blowdown Valve
6. Minimum Pressure/Check Valve
7. Receiver Tank
8. Sequencing Solenoid Valve
9. WS Controller
Figure 2-5: Standard Sequencing Control System
SECTION 2
12
3000-4500 Operator’s Manual and Parts List
®SULLAIR®
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