Atlas Copco GA 160 VSD Instruction Book page 20

Ref.
(7)
(8)
(9)
(10)
If the motor is running at minimum speed and the net pressure rises to a value equal to the sum of the
programmed pressure set-point and the programmed indirect stop offset, the compressor will stop.
When the net pressure drops, the regulator will calculate the optimum moment to restart the compressor to
avoid the net pressure decreasing below the pressure set-point (anticipated starting).
Direct stopping
If the net pressure should rise to a value equal to the sum of the programmed pressure set-point and the
programmed direct stop offset, the compressor will be stopped immediately.
The regulator will calculate the optimum moment to restart the compressor.
Protecting the compressor
Shut-down and motor overload
If the element outlet temperature or compressor outlet temperature exceeds the programmed shut-down level,
the compressor will be stopped. LED (2) will flash and a message will appear on display (1).
The compressor will also be stopped if there is overload of the drive motor.
On air-cooled compressors, the compressor will also stop if there is overload of the fan motors.
Consult the section
the shut-down condition has disappeared, switch on the voltage and press the Reset key.
Shut-down warning
If the element outlet temperature or compressor outlet temperature exceeds a programmed value below the
shut-down level, LED (2) will be lit and a message will appear on display (1) to warn the operator before the
shut-down level is reached.
Consult the section
The message disappears as soon as the warning condition disappears.
18
Designation
Load
Indirect stop
Start
Indirect stop offset
Maintenance warnings and remedy the problem. After remedying the problem and when
Maintenance warnings, stop the compressor and remedy the problem.
Control panel
Instruction book
APF192090