Instruction book

3 Controller

3.1 Controller

Control panel

Introduction
In general, the controller has 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, 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 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

22 ITJ073942
Instruction book

shutdown warning temperature, this will be indicated on the controller display before the
shutdown temperature is reached.
Shutdown
If the compressor element outlet temperature exceeds the programmed shutdown level or the
overload relay of the main motor trips, the compressor will be stopped. This will be indicated on
the display of the controller.

Service warning
If the service timer exceeds the preset value, the controller advises the operator via the display,
to carry out the service maintenance.

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. This function is deactivated on compressors leaving the factory.

3.2 Control panel

Reference Designation Function

1 Display Shows icons and operating conditions.

ITJ073942 23
 Instruction book

Reference Designation Function

2 LED, Voltage on Indicates that the voltage is switched on.
3 Start/stop button Keep pressed for 3 seconds to start compressor.
Press to stop compressor if running.
Use this button to go to previous screen or to end the
current action.
4 Scroll button Use these buttons to scroll through the menu.
5 LED, Warning Is lit if a warning condition exists.
6 LED, Service Is lit when service is needed.
7 Enter button Press 3 seconds to enter in menu.
Use this button to confirm the last action.
Press 5 seconds to reset alarm.
8 Scroll button Use these buttons to scroll through the menu.

3.3 Icons used on the display

Function Icon Description
Stopped/Running When the compressor is stopped, the icon stands still.
When the compressor is running, the icon is rotating.

Compressor status Motor stopped

Running unloaded
Running unloaded (blinking for manual stop)

Running loaded

Machine control mode Remote start/stop active

Automatic restart after Automatic restart after voltage failure is active

voltage failure

Active protection functions Emergency stop

24 ITJ073942
Instruction book

Function Icon Description

Service Service required

Units Pressure unit (Mega Pascal)

Pressure unit (pounds per square inch)

Pressure unit (bar)

Temperature unit (degree Centigrade)

Temperature unit (degree Fahrenheit)

Motor

A time/delay parameter is displayed. NOTE:

• x1000: ON if the displayed value is in thousands of
• hrs: ON if the displayed value is in hours
• s: ON if the displayed value is in seconds

Element outlet temperature

3.4 Main screen

At power on, the first screen is a test screen (Icon, digit and led are on). The next screen is the
Main screen, shown automatically. The Main screen shows:
• The compressor status by means of pictographs;
• The air outlet pressure;

ITJ073942 25
 Instruction book

Main screen with pressure (stopped compressor)

From the Main screen it is possible with up and down buttons (4-8) to change the view from
pressure to temperature of the element outlet.

Main screen with temperature (stopped compressor)

3.5 Main function

To switch on the compressor, press start/stop button (3) for 3 seconds. The compressor starts
and the status is shown:

Screen with running compressor

To stop the compressor, push start/stop button (3). The compressor unloads:

26 ITJ073942
Instruction book

Screen with unloading compressor

When the unload time is elapsed, the compressor is stopped and the controller goes back to
main screen:

Main screen with pressure (stopped compressor)

To enter the main menu (starting from the Main screen), press the enter button (7) for 3 seconds.
The main menu is shown:

First screen of main menu

It is possible to scroll in the menu with the up or down buttons (4-8). To select one item push the
enter button (7). To end the current action push start/stop (3) button.
If the emergency stop button is pushed, the compressor stops immediately and the following
screen will appear:

ITJ073942 27
 Instruction book

Emergency stop

When the emergency push button is restored, reset the alarm by pressing the enter button (7) for
5 seconds. The following screen will appear:

Alarm reset

3.6 Shutdown warning

Description
A shutdown warning will appear in the event of:
• A too high temperature at the outlet of the compressor element.

Compressor element outlet temperature

• If the outlet temperature of the compressor element exceeds the shutdown warning level
(factory set at 110˚C/ 230˚F), warning LED (5) is on.
• Press Scroll up or down buttons (4-8). The screen shows the temperature at the compressor
element outlet.

28 ITJ073942
Instruction book

It remains possible to check the actual status of other parameters by pressing the enter button (7)
for 3 seconds. Press button (3) to stop the compressor and wait until the compressor has
stopped. The warning message will disappear as soon as the warning condition disappears.

3.7 Shutdown

Description
The compressor will stop:
• In case the temperature at the outlet of the compressor element exceeds the shutdown
level, detected by the temperature sensor or by the temperature switch.
• In case of error of the outlet pressure sensor or temperature sensor.
• In case of overload of the compressor motor.
• In case of incorrect phase sequence, detected by the phase sequence relay.

Compressor element outlet temperature

If the outlet temperature of the compressor element exceeds the shutdown level (factory setting
115˚C/239˚F):
• The compressor will stop.
• Alarm LED (5) will flash.
• The following screen will appear:

ITJ073942 29
 Instruction book

Main screen with shutdown indication, element outlet temperature

• The related pictograph

will appear flashing.

• Scroll Up or Down buttons (4-8) until the current element outlet temperature appears.

Shutdown screen, element outlet temperature

The screen shows that the temperature at the outlet of the compressor element is 117 ˚C.
• When the shutdown condition has been solved, press the Enter button (7) for 5 seconds.
• When <rSt> appears on the display, the compressor can be restarted.

Error pressure/temperature sensor

In the event of an error of the outlet pressure sensor (PT20) or temperature sensor (TT11):
• The compressor will stop.
• The following screen will appear:

30 ITJ073942
Instruction book

Example of error sensor

Motor overload
In the event of motor overload:
• The compressor will stop.
• Alarm LED (5) will flash.
• The following screen will appear:

Main screen with shutdown indication, motor overload

• Contact your supplier for fault troubleshooting

• When the shutdown condition has been solved, press the enter button (7) for 5 seconds.
• When <rSt> appears on the display, the compressor can be restarted.

Incorrect phase sequence

In the event of wrong phase sequence:
• The compressor will not start.
• Alarm LED (5) will flash.
• The following screen will appear:

ITJ073942 31
 Instruction book

Main screen with shutdown indication, phase sequence incorrect

• Switch off the voltage, open the disconnector switch and reverse two phases of the supply
cable.
• Switch on the voltage and restart the compressor. The shutdown message will disappear
automatically when the shutdown condition has disappeared.

3.8 Service warning

Description
A service warning will appear when the service timer has reached the preset time interval.
If the service timer exceeds the programmed time interval, alarm LED (6) is blinking with a
following screen:

Blinking screen

• Press Enter button (7) to enter the main menu.

• Select <dAtA> and press Enter button (7) to enter the data menu.
• Scroll (buttons 4-8) until <d.6> and the service symbol is shown.
• Press enter button (7).
• The actual reading of the service timer is shown in <hrs>.

32 ITJ073942
Instruction book

Example of running hours screen

The example screen shows that the service timer is at 2002 hours.
Stop the compressor, switch off the voltage and carry out the required service actions.
After servicing, reset the service timer.
See section Calling up/resetting the service timer.

ITJ073942 33
 Instruction book

3.9 Scrolling through all screens

Control panel

General overview of the menu structure

From the Main screen press the enter button (7) for 3 seconds to enter the Menu. You will find
the following items:

dAtA Data counters parameters.

ProG Submenu of Regulation pressure, Timer, Display setting and Control setting.
tESt Display test.
InFo Information of firmware release.

34 ITJ073942
Instruction book

Overview of the screens

Menu item Submenu Digital input screen Designation

<dAtA> <d.1> Running hours.
(Data) <d.2> Motor starts.
<d.3> Module hours.
<d.4> Loading hours.
<d.5> Load solenoid valve.
<d.6> Service timer.
<ProG> <rEG.P> <Pr.SL> Calling up or modifying pressure band
(Programming) (Regulation selection.
Pressure) <LPr.1> Calling up or modifying lower pressure
setting.
<uPr.1> Calling up or modifying upper pressure
setting.
<LPr.2> Calling up or modifying lower pressure
setting.
<uPr.2> Calling up or modifying upper pressure
setting.
<tiMr> <SrV.d> Maintenance warning.
Timer
<diSP> <tEMP> Calling up or modifying unit of temperature.
(Display) <PrES> Calling up or modifying unit of pressure.
<bC.LG> Calling up or modifying time of backlight.
<Ctrl> <Lo.rE> Local/remote start/stop.
(Control) <Ar.Af> Automatic restart after voltage failure.
<Ar.d> Delay time of automatic restart after voltage
failure.
<nHCA> Maximum number of compressor starts per
hour.
<PASS> Activating password protection.
<tESt> <tSt.1> Display test.
(Test)
<InFo> <P.rEL> Parameter map release.
(Info) <F.rRl> Firmware release.
<F.dAY> Firmware release day.
<F.Mnt> Firmware release month.
<F.YAr> Firmware release year.
<SEr.n> Serial number.

3.10 Calling up running hours

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <dAtA> and press Enter button (7) to enter the Data menu.

ITJ073942 35
 Instruction book

• Scroll Up or Down buttons (4-8) until <d.1> and the motor stopped symbol is shown.
• Press Enter button (7): the running hours are shown.

The screen shows the unit used <x1000 hrs> and the value <11.25>: the running hours of the
compressor are 11250 hours.

3.11 Calling up motor starts

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <dAtA> and press Enter button (7) to enter the Data menu.
• Scroll Up or Down buttons (4-8) until <d.2> and the motor symbol is shown.
• Press Enter button (7): the number of motor starts is shown.

This screen shows the number of motor starts (x1 or - if <x1000> lights up - x1000). In the above
example, the number of motor starts is 10100.

3.12 Calling up module hours

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <dAtA> and press Enter button (7) to enter the Data menu.
• Scroll Up or Down buttons (4-8) until <d.3> and <hrs> is shown.
• Press Enter button (7): the module time appears.

36 ITJ073942
Instruction book

In the example shown, the screen shows the unit used <hrs> and the value <5000>: the
controller module has been in service during 5000 hours.

3.13 Calling up loading hours

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <dAtA> and press Enter button (7) to enter the Data menu.
• Scroll Up or Down buttons (4-8) until <d.4> and the running loaded symbol is shown.
• Press Enter button (7): the loading time is shown.

The screen shows the unit used <hrs> (or <x1000 hrs>) and the value <1755>: the compressor
has been running loaded during 1755 hours.

3.14 Calling up load solenoid valve

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <dAtA> and press Enter button (7) to enter the Data menu.
• Scroll Up or Down buttons (4-8) until <d.5> and the running loaded symbol is shown.
• Press Enter button (7): the number of loadings is shown.

ITJ073942 37
 Instruction book

This screen shows the number of loading actions (x1 or - if <x1000> lights up - x1000). In the
above example, the number of unload to load actions is 10100.

3.15 Calling up/resetting the service timer

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <dAtA> and press Enter button (7) to enter the Data menu.
• Scroll Up or Down buttons (4-8) until <d.6> and <hrs> is shown.
• Press Enter button (7): the service timer is shown.

This screen shows the unit used (<hrs> or <x1000 hrs>) and the value. In the example shown,
the compressor has run 1191 hours since the previous service.

3.16 Calling up/modifying pressure band selection

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <ProG> and press Enter button (7) to enter the Programming menu.
• Scroll Up or Down buttons (4-8) to <reG.P> for regulation pressure.
• Press Enter button (7) to enter the submenu.

38 ITJ073942
Instruction book

• Scroll Up or Down buttons (4-8) until <PrSL> is shown and then press Enter button (7).
• Pressure band 1 (<SEL.1>) is shown. Scroll Up or Down buttons (4–8) to pressure band 2
(<SEL.2>).
• Press Enter button (7) on the desired pressure band.

3.17 Calling up/modifying pressure band settings

Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <ProG> and press Enter button (7) to enter the Programming menu.
• Scroll Up or Down buttons (4-8) to <reG.P> for regulation pressure.
• Press Enter button (7) to enter the submenu.
<LPr.1> is parameter of Load Pressure band 1
<uPr.1> is parameter of Unload Pressure band 1
<LPr.2> is parameter of Load Pressure band 2
<uPr.2> is parameter of Unload Pressure band 2
• Scroll Up or Down buttons (4-8) and press Enter button (7) to select parameter.
• The actually used pressure is shown. Scroll Up or Down buttons (4-8) to set pressure value
and press Enter button (7) to confirm. The unit blinks and the new setting is saved.

3.18 Calling up/modifying the unit of temperature

The unit of temperature measurement can only be changed when the compressor is stopped.
Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <ProG> and press Enter button (7) to enter the Programming menu.
• Scroll Up or Down buttons (4-8) to <diSp> for display settings.
• Press Enter button (7) to enter the submenu.
• Scroll Up or Down buttons (4-8) to <tEMP> and press Enter button (7).
• The actually used unit is shown. Possible settings are <˚C > and <˚F >.
• Scroll Up or Down buttons (4-8) to set the unit of temperature and press Enter button (7) to
confirm. The unit blinks and is saved.

3.19 Calling up/modifying the unit of pressure

The unit of pressure measurement can only be changed when the compressor is stopped.

ITJ073942 39
 Instruction book

Starting from the Main screen:

• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <ProG> and press Enter button (7) to enter the Programming menu.
• Scroll Up or Down buttons (4-8) to <diSp> for display settings.
• Press Enter button (7) to enter the submenu.
• Scroll Up or Down buttons (4-8) to <PrES> and press Enter button (7).
• The actually used unit is shown. Possible settings are <bar>, <psi> and <MPa>.
• Scroll Up or Down buttons (4-8) to set the unit of pressure and press Enter button (7) to
confirm. The unit blinks and is saved.

3.20 Calling up/modifying backlight time

The backlight will be activated after pressing any button and for the interval of time set in the
parameter <bC.LG> (in sec).
Starting from the Main screen:
• Press Enter button (7) for 3 seconds to enter the Main menu.
• Select <ProG> and press Enter button (7) to enter the Programming menu.
• Scroll Up or Down buttons (4-8) to <diSp> for display settings.
• Press Enter button (7) to enter the submenu.
• Scroll Up or Down buttons (4-8) to <bC.LG> and press Enter button (7).
• The current backlight setting is shown. It is possible to set a value between 0s and 120s.
• Scroll Up or Down buttons (4-8) to set the time of backlight and press Enter button (7) to
confirm. The unit blinks and is saved.

3.21 Activating automatic restart after voltage failure

Description
This function allows the compressor to restart automatically after voltage failure. The activation
can only be done by your supplier. Please contact him for further details.
After any power failure, before restarting, the compressor will wait for a fixed time. When delay
time is running, the display will show the related countdown value (in seconds) as below:

Example countdown delay time of automatic restart after power failure.

40 ITJ073942
Instruction book

3.22 Keyboard lock

Keep both Up and Down buttons pressed for more than 3 seconds to lock or unlock the
keyboard.
• The display will show the label <Loc> blinking for 3 seconds if the keyboard has been
locked.
• The display will show the label <UnLo> blinking for 3 seconds if the keyboard has been
unlocked.

Example Lock/unlock screen.

ITJ073942 41