Figure 4-4 Intake Controller - Gardner Denver EBB BB-7.5 HP Operating And Service Manual

To readjust the minimum pressure:
1. Remove the locknut, located below the air/oil
separator.
2. Turn the adjusting screw clockwise to increase
the pressure, counterclockwise to decrease the
pressure.
3. Retighten the locknut.
Air/oil under pressure will cause
severe personal injury or death. Shut
down compressor, relieve system of
all pressure, disconnect, tag and
lockout power supply to the starter
before removing valves, caps, plugs,
fittings, bolts, and filters.
Intake Controller (FIGURE 4–4) – The intake control-
ler is a solenoid operated control for the inlet valve. The
electrical control unit is activated automatically by the
electronic controller. When the unload pressure is
reached the solenoid valve shuts off, the inlet valve is
actuated pneumatically, the intake controller is closed
and the compressor is blown down. When the dis-
charge drops below load pressure, the solenoid valve
is switched on. This closes the blowdown and feeds
FIGURE 4–4 – INTAKE CONTROLLER
the inlet valve cylinder, so inlet valve opening pressure
required to overcome the spring force can be built up
in the cylinder above the piston. This pressure is fully
relieved via a pressure relief delay valve when the sys-
tem is switched off. Only restart the system when it is
blown down. If a restart is attempted with pressure in
the reservoir, the temperature digital display will show
reservoir pressure, and the control will prevent starting
until the pressure drops below 5 psig.
STARTER/CONTROL BOX (FIGURE 1–2, Section 1,
page 2) – The following control components are located
on the combination starter/control box.
Hourmeter – A continuous reading (nonreset) type
hourmeter displays the accumulated operating time of
the unit and provides a convenient means for schedul-
ing changes of oil and servicing of filters, separators
and other devices.
Auto–Sentry S Controller With Keypad – Monitors
and controls compressor operation.
Emergency Stop Pushbutton – Removes power
from the microprocessor controller outputs to provide
a positive means of stopping unit in an emergency situ-
ation.
CONTROL
FIGURE 4–7, page 22. The following are operations of
the Auto–Sentry S Controller.
"STOP/RESET" Button With LED – This button is
used to stop the compressor under ordinary conditions.
It is also used to extinguish any fault LED's that are illu-
minated. In addition, it is used in the procedure to adjust
13–8–612 Page 17
SYSTEM OPERATION – See