Liebert 30-130kVA manual Detecting Trouble, Reporting a Problem, Corrective Actions

Maintenance

4.3Detecting 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 mal- function, and should be investigated.

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 Table 7 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.

NOTE

If the UPS system has a blown fuse, the cause should be determined before you replace the fuse. Contact Liebert Global Services.

4.4Reporting a Problem

If a problem occurs within the UPS, review all alarm messages along with other pertinent data. This information should be given via telephone to the Liebert Global Service dispatcher. This information can also be automatically sent by telephone modem. Call 1-800 Liebert to report a problem or to request assistance.

4.5Corrective Actions

For each alarm message on the Operator Control Panel and the Remote Alarm Status Panel, you can find the recommended corrective action in 3.4.2 - Alarms.

4.6Recommended Test Equipment

A list of recommended test equipment and tools required to maintain, troubleshoot, and repair the UPS module is given in Table 4-2. You may substitute instruments of equivalent range and accuracy. 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.

Table 12 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

100