Control System - Functional Description - Sullair 4500P User Manual

SECTION 2
fluid filter port. There is also a sight glass that
enables the user to check the receiver tank fluid
level. See Section 4.5.
2.5 CONTROL SYSTEM -
FUNCTIONAL DESCRIPTION
Refer to Figure 2-5. The compressor control
system regulates its output to match the demand.
This system consists of a solenoid valve, a
regulator and an inlet valve that control the
compressor's four operational modes. The following
descriptions of operational modes apply to a
compressor whose operating range is 100 to 110
1. Air Outlet
2. Sequencing Solenoid Valve
3. Pressure Regulator
4. Air Inlet
5. Blowdown Valve
Figure 2-5: Standard Sequencing Control System
4500P-7500 USER MANUAL
psig (6.9 to 7.6 bar)
Other pressure settings can be selected depending
on compressor application or rating.
S M - 0
TART ODE TO
There is no load on the compressor at startup, the
solenoid valve is open and the inlet valve is closed.
When the compressor
the receiver tank pressure rises from 0 to 50 psig (0 -
3.4 bar). When it reaches its full operating speed
(maximum rpm), the compressor switches to the Full
Load Mode.
6. Minimum Pressure / Check Valve
7. Receiver Tank
8. Unload Solenoid Valve
9. WS Controller
50 (0 3.5
PSIG TO BAR
I (START) pad is pressed,
)
17