13-8-639 Page 26
Compressor blowdown time before restart. (The air/oil separator must be blowndown before
starting).
Control System Operation
- The purpose of the control system is to adjust the production of
compressed air according to the demands of the system and to lower power consumption.
Compressor Running Fully Loaded
- When the compressor runs loaded, the inlet valve is open and the
compressor produces compressed air.
As the compressor package starts, the motor is started after a four second delay, the inlet control
solenoid valve Item 1, Figure 4-1, page 25, is energized. This opens a connection between the unit’s inlet
and the back side of the inlet valve piston. A partial vacuum on the inlet valve plate and piston cracks
open the inlet valve and the compressor starts producing compressed air. When the pressure in the
air/oil separator increases, the pressure on the upper side of the piston opens the valve completely, and
the compressor runs at full capacity.
Compressor Running Unloaded
- When the compressor is running unloaded, the inlet valve is closed
and the compressor produces no compressed air. At the same time, to minimize power consumption, the
air/oil separator is blown down. When the discharge pressure reaches the unload pressure programmed
into the controller, the inlet control solenoid valve, Item 1, Figure 4-1, page 25, closes the connection to
the upper side of the inlet piston and the air/oil reservoir, and the inlet valve spring closes the inlet valve
plate.
At the same time, the blowdown valve, Item 2, Figure 4-1, page 25, opens and the air/oil reservoir is
blown down. The purge valve, Item 2, Figure 4-1, page 25, is used for bleeding a small amount of air
back into the inlet side of the compressor. This lowers the noise the compressor makes when running in
the unloaded condition.
Automatic Start/Stop
- If demand for compressed air stops, the compressor runs unloaded and blown
down until the automatic timer has counted down, then the unit shuts down. When the demand for
compressed air rises enough to drop the pressure below the load pressure programmed into the
controller, the compressor automatically starts.
STARTER/CONTROL BOX
(Figure 4-2, page 28) - The following parameters of the compressors
operation can be adjusted:
1. Unload Pressure – the pressure at which the compressor unloads (upper limit).
2. Load Pressure – the pressure at which the compressor loads (lower limit).
3. Compressor Automatic Timer – time the unit runs unloaded before the motor stops.
4. Automatic Start after power shutdown.
5. Condensate Removal open time.
6. Condensate Removal close time.
The AIRPILOT ELECTRONIC CONTROLLER has a 7-digit LED display for showing information. The
normal display shows operating pressure and temperature.
Summary of Contents for INTEGRA EFA99F
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