Electronic water drain (ED), typical example
To test the electronic water drain, press the Test button (2) on top of the device.
2.4
Regulating system
Description
When the compressor is started and the net pressure is below the setpoint, the motor speed increases until
the net pressure reaches the setpoint or until the maximum motor speed is reached.
If the air consumption is less than the air delivery of the compressor, the net pressure increases further.
When the net pressure reaches the setpoint (desired net pressure) and continues to rise, the regulator
decreases the motor speed.
When the pressure continues to increase although the motor already operates at minimum speed, the
regulator stops the motor as soon the net pressure reaches a value, equal to the setpoint plus the indirect
stop level (typically 0.3 bar above the setpoint, see section
Should the net pressure rise very quickly to a value equal to the setpoint plus the direct stop level (typically
1 bar above the setpoint, see section
), the compressor is stopped immediately
(without first decreasing the motor speed).
No compressed air is lost when the compressor is stopped in automatic operation, thus saving valuable
energy.
If the compressor was stopped in automatic operation and the net pressure approaches the setpoint, the
regulator starts the motor again. The quicker the net pressure drops, the quicker the compressor will restart.
The pressure in the oil separator vessel is only released to atmosphere when the
compressor is stopped manually or in case of an emergency stop (see chapter Stopping
in section
2.5
Electrical system
Electric components
The electrical system has following components:
Instruction book
18
2920 7109 23
