Energy Guide

04.24.13 Rev. 0.3a 22

STER/SLAVE OPERATION

ter the two compressors have been connected through serial port RS232 on the terminal M2 with length not longer

than 5 m (for longer distances use line converter RS 232/485):

1) select the menu 11 “COMPRESS. CONFIG.” and confirm it by the button ;

2) by the button select “M/S OPERATION” and confirm by the button .

3) By the buttons and select “YES” and confirm it by .

4) By the buttons and set the time for the rotation Master into Slave and confirm by .

5) By the buttons and set the time for Slave starting in case Master has not reached the stop pressure after

the first power on and confirm it by ; the LCD shift back to the message “M/S OPERATION”.

Pushing the Start button of one of the two compressors, both are put in operation:

both LCD of the two compressors visualize the blinking message “OFF” for about 5 seconds; during this time the start

button is not accepted; when the message “OFF” stops blinking, the start button is enabled.

Pushing the Start button of one of the two compressors, both are put in OFF

In case of remote stop, the command received by the Master is priority.

On the first power on, the compressor 1 take the control as Master and the LCD visualizes “M” while the compressor

set as Slave visualizes the message “S”.

The Master control the following parameters: WP1-WP2-WP3-WP4-WP5 and they are transferred to the Slave via serial

port.

The Slave compressor starts only if:

1) on the first on by button or weekly timer, the Master has not reached the stop pressure in the time set;

2) the pressure decreases below the parameter set in WP5.

Master Slave rotation comes:

1) when the timer set in the parameter Timer Master/Slave is elapsed (working hours);

2) in case of shut off alarm on the Master;

3) if one of the two compressors has the working hours higher than the time set in the parameter Timer

Master/Slave (working hours), the other compressor will work continuously till to get the same working hours of

the first compressor in addiction to the hours set in the parameter Timer Master/Slave; only after this time, the

Master/Slave rotation will be operated.

NOTE:

1) In case of maintenance on one of the 2 compressors, before to stop it remember to set both units into standing

alone operation and set it again into Master/Slave operation after the maintenance will be carried out.

2) In case of serial line failure both compressors become Master.