Emerson Liebert PSA Line-Interactive UPS 500-1500VA User Manual

The table below shows UPS-related events that might appear in the Viewer’s Event Configuration 

tab, depending on the communication method used and the UPS model selected in the Viewer (see 

• Contact Closure supports only the first three events in the table below.
• USB communication supports a subset of events in the table below, depending on the UPS model.
• The Advice portion is displayed when you click on the Advice button on a Liebert MultiLink pop-

up notification.

• Liebert MultiLink has three Severity levels: Informational, Impaired and Critical.

UPS Operating 

On Battery

The UPS is discharging the 

battery to supply power to the 

load.

The UPS has detected a power outage or momentary 

disturbance and is now providing battery power to 

your computer. If you anticipate an extended power 

problem, you should save your work and log out now.

Impaired

Low Battery

The UPS has reached a Low 

Battery level. Time available to 

remain on battery is very short.

Save your work and log out now as system shutdown 

will begin shortly. The UPS is running out of battery 

capacity and minimal battery backup runtime remains.

Critical

UPS Output 

Returned From 

Battery

The UPS has returned from an 

abnormal utility input condition.

The UPS is receiving good utility power and is in the 

normal mode of operation. You may continue working.

Informational

Weak Battery 

Condition

(certain UPS 

models only)

The UPS has reported that the 

battery is in a weak condition 

(with utility present). This is a 

contact closure event only.

The UPS is reporting a weak battery condition which 

indicates there currently is little capacity left in the 

battery, or there is possibly a bad battery. If this 

condition persists, the UPS battery may need to be 

replaced.

If you need further assistance, please call Emerson 

Technical Support.

Impaired

UPS 

Communication 

Established

The Liebert MultiLink software 

has established 

communications via the serial 

port. This could be from the 

starting of the service, or a 

reestablishment of 

communication after an 

interruption.

The Liebert MultiLink software has established 

communication with the UPS and is now monitoring 

status. This could be from the starting of the service, 

or a reestablishment of communication after an 

interruption.

Informational

UPS 

Communication 

Loss

An unexpected loss of 

communications with the UPS 

via the serial port.

Please verify that Liebert MultiLink is correctly 

configured and that the physical connection between 

the computer (or server) and UPS is properly installed.

If you need further assistance, please call Emerson 

Technical Support.

Critical

UPS Output 

Operating On 

Bypass

The load has transferred to 

bypass and is unprotected.

The UPS is on bypass and will be unable to power 

your load in the event of a power failure. When a UPS 

experiences an internal failure, the load is switched to 

bypass as a protective measure. The UPS may have 

been manually switched to bypass by a user. If a non-

user initiated bypass condition occurred, you should 

investigate the condition of the UPS.

Impaired

Battery Fully 

Charged

The UPS has reported that the 

battery is fully charged.

The UPS battery is fully charged. You now have the 

maximum amount of battery runtime available for any 

future power outages.

Informational

Battery 

Capacity XX% 

or less

User defined event. The 

battery capacity is equal to or 

fallen below the defined level. 

This event is enabled only 

when operating on battery.

The battery capacity has fallen below a user-defined 

level. Depending on where this level is, you will want 

to take appropriate action such as saving your work 

and logging off. The Battery Capacity level notification 

is user configurable and can be modified in the “Event 

Configuration” tab in Liebert MultiLink.

Impaired