Product Manual

22 Edition 03/2015 Cod. 9828093011 00-
ENGLISH
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14.5 Graphic controller (Option), for fixed speed compressor.
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Introduction
The electronic controller has following functions:
 Controlling the compressor
 Protecting the compressor
 Monitoring components subject to service
 Automatic restart after voltage failure (option)
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Automatic control of the compressor
The controller maintains the net pressure between programmable limits by automatically loading and unloading the compressor in case of
fixed speed machines.
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.
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Protecting the compressor
Shut-down
The compressor will be stopped and it will be indicated on the display in the following events:
 compressor element outlet temperature bigger than the programmed shut-down level detected by temperature sensor
 compressor element outlet temperature bigger than the programmed shut-down level detected by temperature switch
 overload of the drive motor
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In chapter “Shut-down visualization” it’s explained how it appears on the display, how to recognize which is the shut-down and how to solve
it.
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Shut-down warning
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A shut-down warning level is a programmable level below the shut-down level. If one of the measurements exceeds the programmed shut-
down warning level, this will also be indicated to warn the operator before the shut-down level is reached.The shut-down warning appears in
case of:
 Too high temperature at the compressor element outlet
 Too high ot too low dew-point temperature for dryer equipped units
In chapter “Shut-down warinig visualization” it’s explained how it appears on the display, how to recognize which is the warning and how to
solve it.
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Service warning
If the service timer exceeds a programmed value, this will be indicated on the display to warn the operator to carry out some service actions.
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Automatic restart after voltage failure
The controller has a built-in function to automatically restart the compressor when the voltage is restored after voltage failure.
The function is not active and to activate it please contact the customer center.
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Provided the controller is in the automatic operation mode, the compressor will automatically restart when
the supply voltage to the module is restored.