SECTION 2 1800-3000 USER MANUAL
17
2.6 CONTROL SYSTEM,
FUNCTIONAL DESCRIPTION
Refer to Figure 2-4. 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 separator/sump 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 are 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).
Figure 2-4: Standard Sequencing Control System
1. Air Outlet 5. Blowdown Valve
2. Solenoid Valve 6. Minimum Pressure/Check Valve
3. Regulator 7. Separator/Sump Tank
4. Air Inlet
To Next Page
Loading...
