General Description; Controlling The Compressor - Atlas Copco ga37 User Manual

User manual

1 General description

The electronic regulator automatically controls the compressor, i.e.:
- matching the compressor output to the air consumption
- stopping the compressor whenever necessary
- restarting the compressor when required
In order to control the compressor and to read and modify programmable parameters, the regulator
has a control panel provided with:
- LEDs indicating the status of the compressor
- a display indicating the operating conditions, a service need or a fault
- keys to control the compressor and to have access to the data collected by the regulator
- buttons to manually start and stop the compressor
- an emergency stop button or isolator switch
In general, the regulator has following functions:
-

controlling the compressor

- protecting the compressor
- monitoring components subject to service
- automatic restart after voltage failure (made inactive)
1.1 Controlling the compressor
The regulator matches the air output to the air consumption by speed regulation of the motor.
The regulator takes into account a number of programmable settings, such as:
- net pressure setpoint
- indirect stop offset
- direct stop offset
- proportional band
- integration time
- minimum speed
- minimum stop time
- maximum speed limit
- power recovery time (if automatic restart after voltage failure is activated)
If the net pressure keeps on rising when the compressor runs at minimum speed, the regulator will
stop the compressor. The regulator restarts the motor as soon as the net pressure approaches the
net pressure setpoint.
The regulator stops the compressor whenever necessary:
- Indirect stop: i.e. the compressor runs at minimum speed and the net pressure rises to the
indirect stop level.
- Direct stop: i.e. the compressor runs at a speed in between minimum and maximum and the
net pressure rises above the direct stop setpoint.
Both settings are programmable; see section 18.
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