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SECTION 2
Other pressure settings can be selected depending
on compressor application or rating.
S
M
- 0
50
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 separator tube 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.
Figure 2-5: Control System, ST400, ST500, ST700, 5-10 HP
1. Air Outlet
2. Unload Solenoid Valve
3. Air Inlet
4. Minimum Pressure/Check Valve
(0
3.5
)
PSIG
TO
BAR
(START) pad is pressed,
02250180-090 R00
S
HOP
F
L
M
ULL
OAD
ODE
8.8
)
BAR
When the compressed air pressure rises above 50
psig (3.4 bar), the minimum pressure valve opens
allowing compressed air to flow into the service line.
From this point on, the Controller continuously
monitors the line air pressure. The solenoid valve
remains closed in this mode. As long as the
compressor is running at 127 psig (8.8 bar) or lower,
the inlet valve is fully open.
U
M
- G
NLOAD
ODE
(8.8
)
BAR
When there is no, or only a small demand, the
5. Separator Tube
6. Pressure Transducer
7. Controller
8. Check Valve
USER MANUAL
T
™
EK
- 50
127
(3.4
TO
PSIG
127
REATER THAN
PSIG
TO
15
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