6 Single UPS Operation
This chapter briefly describes the operating precautions and routine operations for the Vertiv™ Liebert® APM2 UPS single
module. For the operating precautions and routine operating methods of UPS parallel system, refer to Parallel System and
LBS System on page143.
6.1 Introduction
6.1.1 Precautions
NOTE: The user can perform the next operation only after the authorized engineer completes the first power ON and
test of the UPS.
WARNING! Risk of electric shock and hazardous voltage of mains system and battery. The improper
operation can cause equipment damage, personnel injury or death. The AC input and output terminals of the
UPS have dangerous voltage. If the cabinet is equipped with an EMC filter, the filter may have dangerous
voltage.
There are no operator serviceable parts are located behind the covers that require a specific tool for removal. Only a qualified
service engineer can remove the covers.
1. For the detail operation procedure of the control keys and touch screen, refer to Operator Control and Display
Panel on page53.
2. The audible alarm sounds at various points during operation procedures. The alarm canceled at any time by
pressing the SILENCE ON/OFF key.
3. When UPS uses traditional lead acid battery, the system provides boost charge optional function. If the lead acid
battery is used, when the mains return after an extended mains failure, the charging voltage of the battery will be
higher than the normal charging voltage. This is normal, and the charging voltage of the battery will return to
normal value after a few hours charging.
6.1.2 Power switch
The power switches are inside the Liebert® APM2 UPS cabinet, that can be accessed by opening the front door of the UPS as
shown in Figure 6.1 on the next page, which includes the below switches:
• Q1 Rectifier input switch which connects the UPS to the main circuit power.
• Q2 Bypass input switch which connects UPS to the bypass.
• Q3 Maintenance bypass switch (with error proof operation buckle) which supplies power to the load when UPS is
being maintained.
NOTE: If the UPS system consists of more than two parallel UPS modules, do not use the internal maintenance bypass
switch.
• Q5 Output switch which connects UPS output to the load.
NOTE: Q1, Q2, and Q5 are available for the four switches model while Q3 is available for the single switch.
NOTE: When you are using Q3 or the UPS without switch, install all other switches (including external maintenance
bypass switch) for the UPS maintenance and dust removal.
6 Single UPS Operation Proprietary and Confidential ©2023 Vertiv Group Corp. 101
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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