11 Service and Maintenance
The UPS system (including the battery) requires periodic service and maintenance to ensure long service life. This chapter
provides information about the service life, regular inspection, maintenance and replacement of the key UPS components.
NOTE: Effective maintenance of the UPS system can reduce the risk of UPS failure and will increase the UPS service
life.
11.1 Safety for Service and Maintenance
WARNING! The replacement of the device, service, and Maintenance should be executed by trained service
personnel of Vertiv only. Failure to do so can cause malfunctioning of the device.
WARNING! The neutral line has hazardous voltage when servicing the UPS. pay attention when servicing the
UPS.
WARNING! For the UPS without switch or single switch, switch off the disconnect device before maintenance,
and check whether the UPS is powered on.
CAUTION: 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.
11.2 Service Procedures of Power Module and Bypass Power Module
NOTE: Only Vertiv service engineers must execute the servicing of the power modules and bypass power modules.
1. Remove the power modules and bypass power module from top to bottom, to prevent cabinet toppling due to
high gravity center.
2. Do not disassemble the power module, bypass power module and central control module. They may have high
voltage inside.
3. Service the power modules and bypass power modules after 5 min of unplugging from power source.
4. Put the modules back into the cabinet after 5 minutes after the servicing.
5. Do not pull different types of modules out of the cabinet at the same time.
6. There are two U4 control modules, which are mutually redundant, and support online replacement of a single
module. If the user needs to plug and replace online, it is necessary to check the monitoring alarm and confirm
whether the SC1/SC2 is not ready to be cleared before hot swapping the SC1/SC2, and at least one (SC1/SC2)
must be online.
11 Service and Maintenance Proprietary and Confidential ©2023 Vertiv Group Corp. 167
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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