3
Controller
3.1
Controller
View of the ES 4000 Standard controller
Introduction
The electronic controller has following functions:
• Controlling the compressor
• Protecting the compressor
• Monitoring components subject to service
• Automatic restart after voltage failure
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, e.g. the unloading and loading pressures,
the minimum stop time and the maximum number of motor starts are taken into account.
The controller stops the compressor whenever possible to reduce the power consumption and restarts it
automatically when the net pressure decreases. If the expected unloading period is to short, the compressor
is kept running to prevent too short stand-still periods.
A number of time based automatic start/stop commands may be programmed. Take into
account that a start command will be executed (if programmed and activated), even after
manually stopping the compressor.
Protecting the compressor
Shut-down
Several sensors are provided on the compressor. If one of the measured signals exceeds the programmed
shutdown level, the compressor will be stopped.
Example: If the compressor element outlet temperature exceeds the programmed shut-down level, the
compressor will be stopped. This will be indicated on the display of the controller. The compressor will
also be stopped in case of overload of the drive motor.
Instruction book
2920 7101 41
19
Summary of Contents for CPC 40 G
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