EXS
User Manual 10H52267UM60 - Rev. 1 - 09/2018
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Chapter 5
UPS Operating Instructions
This section introduces the operating precautions and describes the routine UPS operating procedures in detail.
5.1
Brief Introduction
5.1.1
Precautions
Important
The user may only carry out the operations described in this section once the Vertiv service engineer has switched the UPS on for
the first time and completed the commissioning tests
Warning: hazardous mains and/or battery voltage
1. No user serviceable parts are located behind the protective covers that can only be removed by using tools. Only qualified
service personnel are authorized to remove such covers.
2. Hazardous voltages may be present on the UPS AC/DC input and output terminals at any time. If the cabinet is equipped with
an EMC filter, hazardous voltages may be present on the filter.
1. For information about the control keys and LCD relating to the various operating steps, refer to
Chapter 4 Operator
Control And Display Panel.
2. During operation, the buzzer alarm may be activated, if so, you may select the of ‘Mute/Unmute audible alarm’
command via the Control page to silence the audible alarm.
3. When the UPS is equipped with traditional lead-acid batteries, the system provides the optional boost charge
function. If lead-acid batteries are used, when the mains returns after an extended mains failure, the battery charging
voltage will be higher than the normal charging voltage, this is normal, and the charging voltage will return to its normal
value after a few hours.
5.1.2
Power Switch
Open the front door of the UPS cabinet to access the power switches, as listed below, (see Figure 5-1):
Q1: Rectifier input switch, which connects the UPS to the mains power supply.
Q2: Bypass input switch, which connects the UPS to the bypass power supply.
Q3: Maintenance bypass switch (lockable) - supplies power to the load when UPS is being serviced.
Note: If the UPS system consists of more than 2 UPS modules in parallel, do not use the internal maintenance
bypass switch.
Q5: Output switch, which connects the UPS output to the load.
