Regulating System - Atlas Copco LE 3 Instruction Book

Reference
RV
SV
UA
UV
US
Y1
DP
SG
Reference
1
2
3
4
5
6
7
8
9
10
11
2.4

Regulating system

LE 2 up to LE 20 with DOL starter
The regulating system includes:
 Check valve (CV)
 Air pressure switch (MDR) with pressure release valve (6) and on/off button (S1).
 For 10 to 20 Hp also Sol valve (for quicker discharge of head)
Operation
Air pressure switch (MDR) opens and closes its contacts at pre-set pressures. During loaded operation, the
contacts are closed: the motor is running.
When the pressure in the air receiver reaches the pre-set maximum pressure, the contacts as well as pressure
release valve (6) are opened. The motor stops, the air at the delivery side of the compressor is vented to
atmosphere and check valve (CV) closes to prevent venting of the receiver.
When the pressure in the air receiver decreases to the pre-set minimum pressure, the contacts of the air
pressure switch close and pressure release valve (6) closes. The motor restarts and compressed air is supplied
to the receiver again.
LE 5 up to LE 20 each with Y/D starter
The regulating system includes:
20
Description
Pilot valve
Safety valve
Unloader
Unloading valve
Blow-off silencer
Loading solenoid valve
Oil drain plug
Oil level sight-glass
Description
Air inlet silencer
Left cylinder
Right cylinder
Cooler
Cooling pipe
Pressure release valve
Electrical cubicle
Plunger
Spring
Pressure regulator
Refrigerant dryer
Instruction book
2920 7089 80