2.6.4 Maintenance bypass mode
Used when the UPS requires maintenance or repair, maintenance bypass mode operation powers the connected equipment
with utility power while electrically isolating the internal UPS components.
WARNING! Risk of power interruption. Can damage the connected equipment.
If utility power fails or if its quality is out of range while the UPS is in maintenance bypass mode, the UPS may
shutdown without notice and shut off output power to the load.
NOTE: The UPS has no user serviceable parts. If the UPS malfunctions and requires service, visit
http://www.Vertiv.com/en-us/support/ or contact your local Vertiv representative.
Figure 2.8 Maintenance Bypass Operation
Item Description
1 Bypass input
2 Maintenance byass breaker (MBB)
3 Bypass input breaker (BIB)
4 Static switch
5 Rectifier input
6 Rectifier input breaker (RIB)
7 Rectifier
8 Battery charger
9 Battery
10 Inverter
14 Proprietary and Confidential ©2023 Vertiv Group Corp. 2 Product Description
Vertiv™ Liebert® EXS Installer/User Guide
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