Liebert NXC 40kVA - Chapter 10 Service and Maintenance; Safety; Key Components and Service Life of UPS; Life Parameters and the Proposed Replacement Time of Key Components

Chapter 10 Service And Maintenance 79
Liebert NXC 30kVA And 40kVA UPS User Manual
Chapter 10 Service And Maintenance
The UPS system (including battery) needs regular service and maintenance in long-term operation. This chapter
elaborates on the advice on the service life, regular inspection, maintenance and replacement of the UPS key
components. Effective maintenance of the UPS system can reduce the risk in UPS failure and prolong the UPS
service life.
10.1 Safety
Warning
1. Daily inspection of UPS systems can be executed by people who have received relevant training, and the inspection and
replacement of devices should be operated by authorized professionals.
2. The components that can only be accessed by opening the protective cover with tools cannot be operated by the user. Only
qualified service personnel are authorized to remove such covers.
3. Note that the neutral line has hazardous voltage when servicing the UPS.
10.2 Key Components And Service Life Of UPS
When in use, some devices of UPS system will have shorter service life than UPS itself due to abrasion in work. For
the safety of UPS supply system, it is necessary to have regular inspection and replacement of these devices. This
section introduces the key components of UPS and the reference years of service life. For systems under different
conditions (environment, load rate, and etc.), assessment and advice by professionals on whether to replace the
device are required with reference to the information provided in this section.
10.2.1 Life Parameters And The Proposed Replacement Time Of Key Components
Key components in Table 10-1 are used in the UPS system. To prevent system failures due to some of the devices’
failure by wear, it is proposed to carry out regular inspection and replacement during its estimated life.
Table 10-1 Life parameters and the proposed replacement time of key components
Key components Estimated life Proposed replacement time
Proposed inspection
period
Fan
Not less than 7 years
Five years to six years
One year
Air filter
One year to three years
One year to two years
Two months
VRLA battery (5-year life)
Five years
Three year to four years
Six months
VRLA battery (10-year life)
10 years
Six years to eight years
Six months
10.2.2 Replacement Of Air Filter
The air filters need regular inspection and replacement. The inspection and replacement intervals are related to the
environmental conditions of the UPS. Under normal environmental conditions, the air filters should be cleaned or
replaced once every two months and need more frequent cleaning and replacement in dusty or other harsh
environments. Frequent inspection or replacement should also be made in new buildings.
The UPS provides air filters on the back of the front doors of the cabinet, and the user can replace the air filter during
the UPS operation.
Each air filter is fixed by a fixing bar on both sides. Refer to Figure 10-1, the following is the air filter replacement
procedures:
1. Open the front door of the UPS to reveal the air filter on the back of the front door.
2. Remove a fixing bar on one side and loosen the fixing screws of the fixing bar on the other side, with no need to
remove this fixing bar.
3. Remove the air filter to be replaced, and insert a clean one.
4. Re-install the removed fixing bar in the original place and tighten the fixing screws.