DA Series
Operation Manual
24
5.7.2 Temperature protection
Exhaust temperature protection: when the exhaust temperature is higher than the set exhaust
temperature protection value, the controller will alarm and shut down the motor, while the display will
show that the exhaust temperature is too high.
5.7.3 Anti-reversal protection of air compressor
When the phase sequence of the three-phase power supply connected to the air compressor are different
from the controller’s setting, indicating phase dislocation, the controller cannot start up the motor. Change
two phase power cords and observe the rotation of the motor.
5.7.4 Overpressure protection of pressure supply
When the exhaust pressure is higher than the upper pressure limit, the controller will alarm and shut down
the motor while the display will show that the exhaust pressure is too high.
5.7.5 Sensor failure protection
When the pressure sensor or temperature sensor is disconnected, the controller will alarm and shut down
the motor and indicate sensor failure.
6. Function Description of System Components
6.1 Air Filter
The air filter is a kind of dry paper filter to filtrate the air entering the compressor. The filtration efficiency
has direct effects on the service time of the lubricating oil, oil filter, oil separator and body bearing. In case
that the air inlet filter is blocked, the air intake will decrease, thus affecting the air supply. Denair service
staff will suggest changing a new product based on the inlet dust and the service time displayed on the
controller at every onsite inspection. With the controller set to the longest service time, when the
controller displays a warning message, the air inlet filter of the air compressor unit shall be replaced with
a new one.
6.2 Inlet Valve
The inlet valve is a kind of piston valve which facilitates the movement of the piston with the air source
entering through the bottom of the piston
，
thus controlling the air intake. The piston moves farther with
more controlled air source to make the air inlet smaller and reduce the air intake, otherwise the air intake
increases.
6.3 Oil-gas Barrel
In addition to store lubricating oil, the oil-gas separator can primarily separate the air-fuel mixture with
mechanical collision method. The separating effect has an effect on that of the oil separator, thus affecting
the oil content in the air. The oil level indicator on the side of the barrel is used to view the oil level. The oil
drain valve on the bottom is used for draining the condensate water in the oil-gas barrel before starting up
the air compressor and for changing the lubricating oil for periodic maintenance.
