68 Chapter 10 Service And Maintenance
Liebert APM 90 Integrated Modular UPS User Manual
10.2.4
AC Capacitor
It is recommended to replace the AC capacitors after five to six years of continuous work, and inspect them
regularly once a half year. The abnormal ones should be replaced immediately.
10.2.5
Service Life And Recommended Replacement Time Of Key Component
The key components listed in Table 10-1 are used in the UPS system. To prevent system malfunctions caused
by component failure by wear, it is recommended to regularly inspect the components and replace them by
the end of their estimated life.
Table 10-1
Service life and recommended replacement time of key components
Key component
Estimated life
Recommended
replacement time
Recommended
inspection period
AC Capacitor
≥
7 years
5
~
6 years
6 months
Electrolytic capacitor
≥
7 years
5
~
6 years
1 year
Fan
≥
7 years
5
~
6 years
1 year
Air filter
1
~
3 years
1
~
2 years
2 months
VRLA battery (5-year life)
5 years
3
~
4 years
6 months
VRLA battery (10-year life)
10 years
6
~
8 years
6 months
10.2.6
Fuse Replacement
When replacing the fuses, use fuses in the same model as the original ones. Avoid being misled by the
parameter silkscreens on the fuse boxes. The AC fuses and DC fuses in the system are not interchangeable.
10.2.7
Replacement Procedures Of Air Filter
As shown in Figure 10-1, the UPS provides four air filters on the back of the front door, each fixed by a fixing
bar on both sides. The air filter replacement procedures are as follows:
1. Open the front door of the UPS to reveal the air filters on the back of the door.
2. Remove a fixing bar on either side of the air filter.
3. Remove the air filter, and insert a clean one.
4. Replace the fixing bar.
Air filters
Fixing bar
Fixing bar
Air filters
Fixing bar
Air filters
Fixing bar
Air filters
Figure 10-1
Replacing air filter