UPS Alarm and Status Messages

Table 7

Liebert NXL alarm and status messages (continued)

 

 

 

Event Message

Event Definition

Recommended Action

 

 

 

Press “SILENCE” to silence the audible alarm.

 

 

 

Observe the One-Line Display. If the input line is

 

 

 

orange, black, or gray, the battery discharging

 

 

 

condition is normal.

 

 

 

If the input line on the One-Line Display is green,

 

 

 

check the Active Event Window for potential fault

 

 

 

conditions that could explain why the UPS is on

 

 

 

battery. An example of this could be “Rectifier

 

 

 

Fault.”

 

 

The UPS is on battery.

Monitor the UPS during the battery discharge. The

 

 

display shows the discharge curve of the battery.

 

 

The most common reason for going to battery is a

 

 

loss of rectifier input power (power outage).

When the Battery Voltage Line touches the End of

Batt Discharging

Discharge Line, the UPS shuts down.

This alarm is self-clearing. When the condition is

 

 

Check the bypass line on the One-Line Display. If

 

 

no longer present, the alarm and any control

 

 

the line feeding the Static Bypass Switch (BPSS) is

 

 

activity tied to the alarm reverts to normal.

 

 

green, the unit can be transferred to bypass by

 

 

 

 

 

 

pressing “Transfer,” “Bypass” to transfer the load to

 

 

 

the bypass source. Note that transferring to bypass

 

 

 

could expose the load to an outage if the bypass

 

 

 

source fails.

 

 

 

If the battery is discharging because of a fault such

 

 

 

as “Rectifier Fault” in the Active Event Window

 

 

 

rather than an actual power outage, transfer to

 

 

 

bypass if available, and contact your factory-

 

 

 

authorized service provider.

 

 

The batteries are being equalized.

 

 

 

Battery equalization stops automatically based on

In normal operation, no user response is required.

 

 

the Equalize Time Setting.

Equalize charge can be terminated at any time by

Batt Equalizing

This status message is self-clearing. When the

pressing “Battery Management,” “Manual Battery

 

 

condition is no longer present, the message and

 

 

Equalize,” “Stop.”

 

 

any control activity tied to the status event reverts

 

 

to normal.

 

 

 

 

Press “SILENCE” to silence the audible alarm.

 

 

Detected battery ground current exceeds the trip

Are any Battery Circuit Breakers tripped?

 

 

Perform a visual inspection of the batteries in the

 

 

setting.

 

 

tripped string(s). Look for signs of leaking battery

 

 

A possible symptom that could cause this alarm is

 

 

acid or excessively corroded battery terminals.

 

 

a leaking battery.

If there are no visible signs of defective batteries,

 

 

This alarm has a higher detection setpoint than

 

 

press “RESET” to try and clear the alarm.

Batt Ground Fault

“Battery Ground Fault Current Warning,” and if

Close any open breakers one at a time, pressing

 

 

present, means that the Battery Ground Fault

 

 

“RESET” after each one to see which string is

 

 

Current is excessive.

 

 

causing the alarm. The string reporting the fault,

 

 

This alarm could cause Battery Breakers to trip if

 

 

when online, will not allow the alarm to reset.

 

 

the “Battery Ground Fault Trip Enable” setting is

 

 

Once the location is identified, or if the battery string

 

 

enabled.

 

 

tests are inconclusive, contact your factory-

 

 

 

 

 

 

authorized service provider.

 

 

 

 

44

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Emerson 250-400kVA manual Observe the One-Line Display. If the input line is