SECTION 2 3000P-4500 USER MANUAL
17
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 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 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).
1. Air Outlet
2. Unload Solenoid Valve
3. Pressure Regulator
4. Air Inlet
5. Blowdown Valve
6. Minimum Pressure/Check Valve
7. Separator/Sump Tank
8. Sequencing Solenoid Valve
9. WS Controller
Figure 2-5: Standard Sequencing Control System
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