3 Controller
3.1 Controller
Control panel
Introduction
In general, the controller has the following functions:
• Controlling the compressor;
• Protecting the compressor;
• Monitoring service intervals;
• Automatic restart after voltage failure (made inactive);
Automatic control of the compressor
The controller maintains the net pressure between programmable limits by automatically loading
and unloading the compressor. A number of programmable settings are taken into account, e.g.
the unloading and loading pressures, the minimum stop time and the maximum number of motor
starts.
The controller stops the compressor whenever possible to reduce power consumption and
restarts it automatically when net pressure decreases. If the expected unloading period is too
short, the compressor is kept running to prevent too short standstill periods.
Protecting the compressor
Shutdown temperature warning
The shutdown temperature warning is a programmable warning that advises the operator that the
shutdown temperature is nearly reached. If the measured temperature exceeds the programmed
Instruction book
24 2920 7119 21
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