Emerson 480V Manuel D’Utilisation

The Mimic display on the front panel consists of six indicators arranged in a single-line diagram 

depicting the various paths of UPS power, as shown in Figure 47. 

The current operational status of the Liebert NX is indicated by the color of the indicators—green, 

amber or red—and whether they are ON (solid), flashing or OFF. Table 15 provides a guide to inter-

preting the various states of the indicators.

Load on rectifier

Flashing Green: Utility normal,

but rectifier not operating

Rectifier fault

Rectifier is normal, but utility is 

abnormal

Battery powering

the load

Flashing Green: Battery pre-

warning (low battery)

Battery or battery

converter abnormal*

Battery and converter are 

normal, and battery is not 

discharging

Inverter powering

the load normally

Flashing Green: Inverter on 

standby

Inverter fault

Inverter normal, but off

Load on Bypass

power

—

Bypass out of 

normal range

Bypass Normal

UPS output on

—

UPS output 

overloaded

UPS no output power

No alarms—UPS

working normally

Amber: UPS has a general 

alarm

UPS has a serious 

alarm

—

* Battery or battery converter abnormal events include these event messages (see Appendix A): No Battery, Battery Replaced, Battery 

Reverse, Batt. Conv. Over. Curr., Batt. Converter Fault, Batt. Converter Overtemp.

INVER TER  ON

SILENC E ON/ OFF

INVER TER  OFF

FAULT C LEAR

EPO

F2

F4

HELP

F1

F3

?

LED1

LED2

LED3

LED4

LED5

STATUS

Rectifier indicator

Battery indicator

Bypass indicator

Inverter indicator

Load indicator

Status indicator

Buzzer