Detecting Trouble; Reporting A Problem; Corrective Actions - Emerson Liebert NXL series Operation And Maintenance Manual

Liebert NXL UPS

3.5 Detecting Trouble

It is important that the operator check the instrument readings if abnormal equipment
performance is suspected. Any metered value that differs appreciably from normal could
mean an impending malfunction and should be investigated.
Items to check include:
• If the UPS has not operated on battery power during the last 10 hours, the batteries
should require little charging current. Battery mimic should indicate normal DC voltage
with the battery charge current no more than 1% of maximum discharge current.
• Input current on each phase should be within 10% of the average input current.
• Alarm messages indicate malfunction or impending malfunction. A daily check of the
Display Screen will help to provide an early detection of problems. Refer to Table 6 for
information about interpreting alarm messages.
• Tracing a problem to a particular section is facilitated by alarm messages and the
metered parameter indications.
If the UPS system has an open fuse, the cause should be determined before replacing the
fuse.
Contact Liebert Services for assistance.
3.6

Reporting a Problem

If a problem occurs within the UPS, review all alarm messages along with other pertinent
data. Contact Liebert Global Services Support to report a problem or to request assistance.

3.7 Corrective Actions

For each alarm message on the Display Screen, you can find the recommended corrective
action in Table 6.
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Operation and Maintenance Manual
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250-300-400-800kVA