Liebert Autochangeover Controllers AC4 Manual Do Utilizador

Each input has a default label (Device_1, Device_2, etc.) that you may 

change to a more descriptive name for ease in recognizing alarms and 

events associated with the input. The label may consist of up to eight 

characters (see Table 12 for valid characters).
The device name assigned through this menu is also displayed for the 

corresponding output. 

If the input label is changed, the output will change also.

• From the Setup Inputs Menu, choose Label for the selected input—Label: Device_1 in the 

example at right—and press Enter

↵

.

• To change the input’s label, which may consist of up to eight characters:

• Use the arrows

↑↓

 to

 

choose a character.

• Press Enter

↵ 

to advance to the next character position.

• When finished, press Enter

↵

 again.

Each input may be set up as Normally Open (NO) or Normally Closed 

(NC). The default setting for all input points is NO (Normally Open).
If you require an input to be a supervised point, define the input as 

Normally Closed (NC).

• From the Setup Inputs Menu, choose Norm Open/Close, as 

shown at right, and press Enter

↵

.

• To change the normal state for this input, use the arrows

↑↓

 to

 

choose NO (Normally Open) or NC (Normally Closed), then press 

Enter

↵

.

Each input may be defined as Alarmable (AL) or as an Event (EV).

• For an input defined as alarmable, a change in the status of the 

device triggers these actions: the LCD flashes, the audible horn 

sounds, a record is entered in the Alarm Log and the common 

alarm relay is energized. 

• For an input defined as an event, a change in the status of the 

device is recorded in the Event Log.

For both types (alarmable and event), user setup determines output 

control—whether the device that changed status is disabled or kept in 

operating mode and whether a standby device is set to operate.
By default, all inputs are set up as AL (Alarmable).

• From the Setup Inputs Menu, choose Alarm/Event, as shown at 

right, and press Enter

↵

.

• To change the type of input, use the arrows

↑↓

 to

 

choose AL (Alarmable) or EV (Event), then press 

Enter

↵

.

Device_1

Input 1

Output 1

Device_2

Input 2

Output 2

Device_3

Input 3

Output 3

Device_3

Input 3

Output 3

SETUP DEVICE_1

NORM OPEN/CLOSE: NO
ALARM/EVENT: AL

↑↓

=NEXT

↵

=SELECT

LATCHED: N
DELAY: 00:01

CHANGE LABEL

DEVICE_1

↑↓

=SELECT 

↵

=NEXT/END

SETUP DEVICE_1

LABEL: DEVICE_1

ALARM/EVENT: AL

↑↓

=NEXT

↵

=SELECT

LATCHED: N
DELAY: 00:01

IS INPUT NORMALLY
OPEN OR CLOSED? NO

↑↓

=NO/NC

↵

=END

SETUP DEVICE_1

LABEL: DEVICE_1
NORM OPEN/CLOSE: NO

↑↓

=NEXT

↵

=SELECT

LATCHED: N
DELAY: 00:01

IS INPUT AN ALARM
OR EVENT? AL

↑↓

=AL/EV

↵

=END