EXS
50 User Manual 10H52260UM60 - Rev. 1 - 10/2017
Chapter 5 Operating Procedures
This section introduces the operating precautions and describes the UPS operating procedures in detail.
5.1 Brief Introduction
Precautions
Important
The user may only carry out the operations described in this section once the authorised 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 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 related to all the operating steps, refer to Chapter 4 .
2.
Duri
ng operation, the buzzer alarm may be activated at any time. Press the key for 3s 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.
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 - connects the UPS to the main power supply.
Q2: Bypass input switch - 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 - connects the UPS output to the load.
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