Vertiv™ | Liebert® EXM
™
50-250kVA, 480V, 60Hz User Manual | 85
Items to check on the various UPS display screens include:
1. Output voltage of all phases should be within 2% of normal voltage. Output currents on each phase should
not normally differ by more than 20%. If a greater difference is noted, the load is unbalanced and
corrective action should be taken to redistribute the load, if possible.
2. 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 relatively little battery charge
current.
3. 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 Operator Control Panel will help to provide an
early detection of problems. Refer to Appendix B - UPS Status Messages to interpret alarm messages.
4. Tracing a problem to a particular section is facilitated by alarm messages and the metered parameter
indications. These are stored in the Status Reports and can be displayed at the Operator Control Panel or
at an optional terminal.
8.5 Reporting a Problem
If a problem occurs within the UPS, review all alarm messages along with other pertinent data.
This information should be given to the Vertiv
™
Services dispatcher. Call 800-543-2378 to report
a problem or to request assistance.
8.6 Corrective Actions
Recommended corrective actions for each alarm message on the Operator Control Panel and the
Remote Alarm Status Panel may be found in Appendix B - UPS Status Messages.
8.7 Recommended Test Equipment
Table 32 lists recommended test equipment and tools required to maintain, troubleshoot and
repair the UPS module. Instruments of equivalent range and accuracy may be substituted. All
instruments should be calibrated and be within the current calibration cycle. Calibration data for
the instruments should be maintained in equipment-history files and the instruments labeled for
audit and verification.
NOTE
If the UPS system has a blown fuse, the cause should be determined before you replace the fuse.
Contact Vertiv
™
Services.
Table 32 Recommended test equipment and tools
Qty Test Equipment Manufacturer Model or Type
1 Oscilloscope Tektronix, H-P or Fluke DC to 50 MHz
2 Voltage Probes Tektronix, H-P or Fluke 10X, with 10 ft. Cable
2 Voltage Probes Tektronix, H-P or Fluke 100X, with 10 ft. Cable
1 Digital Multi-
Meter
Fluke 8060, with Test Leads
1 Tool Kit N/A Standard electrical contractor
tools
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