Schulz SRP 3040E Manual De Instrucciones página 50

SCREW AIR COMPRESSOR
CONTROL SYSTEM
COMPRESSOR CONTROL AT FULL LOAD (CAr)
1. When compressed air is being produced by the compressor at pressures greater than 2.7 - 4.1 bar (40-60
psig) and less than nominal pressure set at the electronic interface (Figure 13, page 47, item ) the
compressor is said to be operating in a loaded state. At pressures nearing nominal pressure when the unit is
compressing it's maximum volume of air the compressor is said to be at "Full Load".
2. When pressure reaches the compressor's nominal pressure as established in the electronic interface (Item
2 ) the solenoid valve (item ) is de-energized. This closes the control circuit to the inlet control valve (item )
which then closes and restricts air inlet to nearly zero.
COMPRESSOR CONTROL UNLOADED (ALI)
1. In this control phase, the inlet valve will be closed, preventing full air intake. However, minimal air will be
drawn through orifice
air volume decreases. Consequently, power consumption drops as well due to the decreased air mass
requiring compression.
2. With compressor unloaded, the air/oil tank will de-pressurize until equilibrium is established between the
air passing through the by-pass orifice and the air volume drained by the unload route. Pressure in the tank
will be then equalized between 3.1 to 4.1 bar (45 to 60 psig), which will guarantee the system's lubrication.
Power consumption will be reduced to about 50%, as long as the compressor remains unloaded.
3. In this control phase, the compressor will not deliver air to the network. Should there be any air
consumption at this moment, pressure will decrease in the system and the Electronic Interface will energize
solenoid valve (item ) and the compressor will return to full load (
SRP 3040 - ANALOG INTERFACE VERSION
4
48
1
"A" , called by-pass orifice, to insure oil circulation. Since this orifice is small, the intake
1
2
B
5
3
A
6
FIGURE 14 - CONTROL SYSTEM - SRP 3040
CAr ) operation.
1
A- FEEDING HOLE WHEN THE SYSTEM
IS UNLOADED
B- TIMER
SRP 3040E - SRP 3040
2
3