Emerson 240V Manuel D’Utilisation

In the event of an alarm, the User Interface LCD will display the last message regardless of the 

default screen. A list of possible alarm messages is displayed below. If you encounter one of these or 

other alarm messages and are unsure of the corrective action to take, please contact a qualified Lie-

bert representative at the number listed on the back of this manual.

Main Control Failure The Nfinity system has detected a 

System Control Module failure.

Identify and replace the failed System Control Module or 

contact Liebert Global Services for support.

Power Module Fail

The Nfinity system has detected a Power 

Module failure.

Identify and replace the failed Power Module or contact 

Liebert Global Services for support.

Battery Module Fail

The Nfinity system has detected a Battery 

Module failure.

Identify and replace the failed Battery Module or contact 

Liebert Global Services for support.

Redun. Control Fail

The Nfinity system has detected a 

System Control Module failure.

Identify and replace the failed System Control Module or 

contact Liebert Global Services for support.

Battery Card Failure The Nfinity system has detected an 

Intellislot Battery Card failure.

Identify and replace the failed Intellislot Battery Card or 

contact Liebert Global Services for support.

UPS On Battery

The Nfinity is drawing power from the 

batteries, not from utility.

Verify input breaker is closed. Verify input voltage is 

present and correct voltage. Verify input frequency is 

correct.

Reminder alarm - 

Check air filter

The fan filter reminder time has elapsed.

Check and clean the fan filter and acknowledge the alarm. 

This alarm may be disabled or the interval between these 

alarms can be configured via the User Interface.

Short Circuit 

Recovery - Please 

Wait

User tried to turn the output on following a 

short circuit on the output without waiting 

for the required 30 seconds to expire.

Wait for at least 30 seconds and then turn the output on.

Power Module N+1 

Redundancy Alarm

Number of power modules is not 

adequate to provide power redundancy.

Reduce the UPS’s load, add power modules to the frame 

or disable the alarm feature via the User Interface.

Output Off - Output 

Short Circuit

A short circuit was detected on the output. Correct short (or extreme overload condition) and turn on 

the UPS’s output.

UPS Output 

Overload

The load on the Nfinity exceeded the 

capacity of the active power modules.

Reduce the UPS’s load or add power modules.

Output exceeds

max load setting

This will occur if the max load alarm is 

enabled, and the measured load at the 

UPS’s output is greater than the value 

set.

Reduce the UPS’s load, increase the Maximum Load 

Alarm limit via configuration or disable the Maximum Load 

Alarm limit via configuration.

Output Off- 

Overload, bypass 

unavailable

Normally a severe overload will cause the 

unit to go to automatic bypass. This event 

informs the user that bypass was not 

qualified so the unit dropped the load to 

protect itself.

Reduce the UPS’s output load and verify that the UPS’s 

bypass source is qualified (amplitude and frequency). 

Verify that the configuration voltage and frequency 

settings are properly selected.

Switch To 

Manual Bypass

The Nfinity is on automatic bypass. 

Manual bypass switch should be 

activated before servicing.

Transfer Nfinity to manual bypass and call Liebert service 

for assistance.

Load Exceeds 

Battery Module 

Capacity

The measured load on the output will 

cause the battery modules to exceed their 

limits if the UPS transfers to battery 

mode.

Reduce the UPS’s load or add battery capacity. If external 

non-modular battery cabinet(s) are added, verify that the 

UPS’s configuration is set to match the external battery 

amp-hour rating and charger rating.

Bypass source 

not qualified

The input voltage is not within the 

specified voltage or frequency range so 

the UPS will not allow an automatic or 

manual transfer to bypass.

Verify UPS’s configuration for voltage and frequency. 

Check UPS’s input breaker; disable this alarm if desired 

via configuration.

Load exceeds 

frame limit

Load is greater then the rated frame limit. Reduce the UPS’s load.