UPS Alarm and Status Messages

 

 

 

 

Table 7

Liebert NXL alarm and status messages (continued)

 

 

 

Event Message

Event Definition

Recommended Action

 

 

This is a summary event that informs the user that

Press “SILENCE” to silence the audible alarm.

 

 

a circuit breaker that was either signaled to close

Check the One-Line Display and the Active Event

 

 

Window to determine which breaker or switch is

 

 

or was manually closed failed to report a closed

 

 

open.

Breaker Close Fail

status.

If the open breaker cannot be reset or closed, or if

 

 

The Breaker Close Fail event indicates a

 

 

all breakers are closed but the One-Line Display

 

 

mismatch between the expected state of a

 

 

does not agree, or the alarm cannot be cleared,

 

 

breaker and the reported state of the breaker.

 

 

contact your factory-authorized service provider.

 

 

 

 

 

 

 

 

 

 

Press “SILENCE” to silence the audible alarm.

 

 

This is a summary event that informs the user a

Check the One-Line Display and the Active Event

 

 

Window to determine which breaker or switch that

 

 

circuit breaker that was either signaled to open or

 

 

should be open is still closed.

 

 

was manually opened failed to report an open

If a breaker that should be open shows closed, or if

Breaker Open Fail

status.

the breaker in question actually is open but the fault

 

 

The Breaker Open Fail event indicates a

 

 

is still present, attempt to clear the fault by pressing

 

 

mismatch between the expected state of a

 

 

“RESET.”

 

 

breaker and the reported state of the breaker.

 

 

If the event does not reset, contact your factory-

 

 

 

 

 

 

authorized service provider.

 

 

 

 

 

 

 

Press “SILENCE” to silence the audible alarm.

 

 

 

Observe the calculated load percentage on A phase

 

 

 

displayed on the Module Output Meter. If the A

 

 

The critical load is greater than 110% while the

phase steady state load percentage exceeds 110%,

 

 

perform the following:

 

 

UPS is on bypass. The controls may shut the unit

 

 

If Maintenance Bypass is available, follow Standard

 

 

down if the overload condition does not clear

Operating Procedures to transfer the load to

 

 

within the allotted time. Allotted time is variable,

 

 

Maintenance Bypass.

 

 

and is inversely proportional to the amplitude of

Byp Overload

If Maintenance Bypass is not available but the

the overload, i.e., the greater the amplitude of the

Ph A

 

system has an Internal Bypass Breaker (CB3 on the

 

 

overload, the less time the unit continues to

One-Line Display), close CB3. Note that depending

 

 

support the load.

 

 

on the severity of the overload, the possibility exists

 

 

This alarm is self-clearing. When the condition is

 

 

that CB3 could trip if the overload exceeds the

 

 

no longer present, the alarm and any control

 

 

breaker rating.

 

 

activity tied to the alarm reverts to normal.

 

 

Investigate the overload condition.

 

 

 

 

 

 

If the Module Output Meter does not indicate an

 

 

 

overload condition, perform the previous steps and

 

 

 

contact your factory-authorized service provider.

 

 

 

Press “SILENCE” to silence the audible alarm.

 

 

 

Observe the calculated load percentage on B phase

 

 

 

displayed on the Module Output Meter. If the B

 

 

The critical load is greater than 110% while the

phase steady state load percentage exceeds 110%,

 

 

perform the following:

 

 

UPS is on bypass. The controls may shut the unit

 

 

down if the overload condition does not clear

If Maintenance Bypass is available, follow Standard

 

 

Operating Procedures to transfer the load to

 

 

within the allotted time. Allotted time is variable,

 

 

Maintenance Bypass.

 

 

and is inversely proportional to the amplitude of

Byp Overload

If Maintenance Bypass is not available but the

the overload, i.e., the greater the amplitude of the

Ph B

 

system has an Internal Bypass Breaker (CB3 on the

 

 

overload, the less time the unit continues to

One-Line Display), close CB3. Note that depending

 

 

support the load.

 

 

on the severity of the overload, the possibility exists

 

 

This alarm is self-clearing. When the condition is

 

 

that CB3 could trip if the overload exceeds the

 

 

no longer present, the alarm and any control

 

 

breaker rating.

 

 

activity tied to the alarm reverts to normal

 

 

Investigate the overload condition.

 

 

 

 

 

 

If the Module Output Meter does not indicate an

 

 

 

overload condition, perform the previous steps and

 

 

 

contact your factory-authorized service provider.

47

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Emerson 250-400kVA manual Reset