Emerson Liebert NXL 250 kVA, Руководство по эксплуатации и обслуживанию

Страница: 92 / 112

UPS Alarm and Status Messages
Liebert
®
NXL
™
84
Byp
Overload
Ph C
The critical load is greater than 110% while the
UPS is on bypass. The controls may shut the
unit down if the overload condition does not clear
within the allotted time. Allotted time is variable,
and is inversely proportional to the amplitude of
the overload, i.e., the greater the amplitude of
the overload, the less time the unit continues to
support the load.
This alarm is self-clearing. When the condition is
no longer present, the alarm and any control
activity tied to the alarm reverts to normal.
Press “SILENCE” to silence the audible alarm.
Observe the calculated load percentage on C
phase displayed on the Module Output Meter. If
the C phase steady state load percentage exceeds
110%, perform the following:
If Maintenance Bypass is available, follow
Standard Operating Procedures to transfer the
load to Maintenance Bypass.
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.
Bypass Breaker
(SBB) Open
The bypass circuit breaker indicates that it is in
the open position.
Bypass
Not Avail
This summary event indicates a problem with the
detected bypass voltage. If bypass is not
available, transfers to bypass are disabled.
This alarm is self-clearing. When the condition is
no longer present, the alarm and any control
activity tied to the alarm reverts to normal.
Press “SILENCE” to silence the audible alarm.
Observe the One-Line Display. The bypass power
line feeding the static switch is green when bypass
power is within normal operating range. If the line
feeding the static switch is orange, gray, or black,
bypass voltage is out of tolerance. Also check the
bypass voltage readings on the Bypass Meter.
When the bypass returns to normal, this alarm
clears automatically. If all indications checked
above are normal and the alarm is still present,
contact your factory-authorized service provider.
If there is a problem indicated with the bypass
voltage, investigate and resolve the issue.
Examples of conditions which could cause this
alarm: Unstable generator voltage; or, Bypass
Feeder Breaker tripped.
Bypass OF/UF
The bypass frequency has exceeded the bypass
frequency limit of ± 5 Hz of nominal. If this alarm
is active, transfers to bypass are disabled.
This alarm is self-clearing. When the condition is
no longer present, the alarm and any control
activity tied to the alarm reverts to normal.
Press “SILENCE” to silence the audible alarm.
Check the frequency on the Bypass Meter. If the
frequency is outside the synchronization range,
investigate and resolve the issue.
This alarm is commonly the result of an
uncalibrated generator, or power anomalies on the
utility feed. Check bypass power for nominal limits.
If bypass frequency appears normal, contact your
factory-authorized service provider.
Controller Error
This is a summary event that indicates a DSP
communication error.
The Controller Error event is a fault condition that
indicates a loss of communications in the
controls.
Press “SILENCE” to silence the audible alarm.
Press “RESET” to attempt to reset the fault.
Contact your factory-authorized service provider
Controls
Comm Fail
The Controls Communication Failure event
indicates a loss of communications between the
Controls and Human Machine Interface (HMI).
The Controls Communication Failure event is
displayed when the HMI detects a loss of
communication with Controls on the Controller
Area Network (CAN).
An infrequent occurrence that resets
immediately is probably not serious.
If the alarm does not clear, or if the alarm condition
returns, contact your factory-authorized service
provider.
Controls
Reset
Required
This alarm means one or more critical settings
have been changed by user during UPS
operation.
The change(s) will not take effect until after a
UPS Controls reset. This operation should only
be performed by an authorized service
personnel.
This alarm is cleared after UPS Controls reset.
Press “SILENCE” to silence the audible alarm.
Table 10 Liebert NXL alarm and status messages (continued)
Event Message Event Definition Recommended Action