CHIWAI Quan Wei, Инструкция по использованию и обслуживанию, Страница: 19 / 90

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relief valve to move out of air. In order to avoid the frequent operation of the safety valve and
increase the safety factor of the machine, it is necessary to set up this protection.
3.3.4 Oil pressure protection (User selection)
When the oil pressure of the system is lower than 0.15-0.2Mpa, the pressure switch signals the
motor to stop running and protect the air end from oil shortage and burn.
3.3.5 Alarm device
There are three kinds of alarm devices: air filter blocking, oil filter blocking, oil separator
blocking. (Greater then132Kw)
They are displayed on the LCD panel. When the panel has a fault indication, that is, a filter has
been blocked, the user must in the shortest time to replace the spare goods, and otherwise it will
affect the performance and safe operation of the air compressor.
3.4 Control system and electrical circuit
3.4.1 Control system
1) Motor starting (step-down or Y operation).
During this period, the (three-phase) solenoid valve shall not be electrified, the intake valve shall
be completely closed, and the emptying valve shall be fully opened, at which time the inlet side
shall become a vacuum, and the lubricating oil required for the compressor and bearing shall be
ensured by the pressure difference between the compressing chamber and the oil and gas barrel.
2) Full voltage motion of motor (full voltage or
△
Operation).
When the pressure in the oil and gas barrel gradually rises above 0.15Mpa, the inlet valve is
completely open, so the pressure in the oil barrel increases rapidly and the compressor starts to
operate at full load. When the pressure rises to 0.45~0.50Mpa, the minimum pressure maintenance
valve is fully open and the air output.
3) Heavy / no-load operation
When the exhaust pressure reaches the upper limit of the system, the power supply (three-phase)
solenoid valve is cut off, and the intake valve is closed. At the same time, the exhaust valve is
completely opened, and the air in the oil and gas barrel is discharged into the atmosphere. At this
time, the compressor operates in a no-load state. The required lubricating oil is ensured by the
difference between the pressure in the compression chamber and the oil and gas tank. When the
pressure of the pipeline system falls below the limit set by the system, the power supply (three-
phase) solenoid valve is again opened, the intake valve is also fully open, the discharge valve is
closed, and the compressor is reloaded.