Fuse Replacement; Replacement Of Air Filter - Emerson Liebert NX300 Series User Manual

92 Chapter 10 Service And Maintenance
Key component
AC Capacitor
Electrolytic capacitor
Fan
Air filter
VRLA battery (5-year life)
VRLA battery (10-year life)

10.2.6 Fuse Replacement

When replacing the fuses on high-voltage interface boards or inside fuse boxes, 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 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 door of the cabinet. Each air filter is fixed by a fixing bar on both
sides.
For 250kVA ~ 400kVA UPS and 600kVA ~ 800kVA UPS, the replacement procedures of the air filters of the main
power cabinet and bypass cabinet are the same. Refer to Figure 10-1, the following takes the air filters of the main
power cabinet as an example to introduce the air filter replacement procedures:
1. Open the front door of the main power cabinet of the UPS to reveal the air filters on the back of the front door.
2. Remove a fixing bar on either side of the air filter to be replaced, 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, and insert a clean one.
4. Re-install the removed fixing bar in the original place.
5. Tighten the fixing screws of the fixing bar on the other side.
NX UPS Single Module And Parallel System 250kVA ~ 800kVA User Manual
Table 10-1 Service life and recommended replacement time of key components
Estimated life
≥7 years
≥7 years
≥7 years
1 ~ 3 years
5 years
10 years
Recommended replacement time
5 ~ 6 years
5 ~ 6 years
5 ~ 6 years
1 ~ 2 years
3 ~ 4 years
6 ~ 8 years
Recommended inspection period
6 months
1 year
1 year
2 months
6 months
6 months