Chapter 5 Ups Operation Introduction; Brief Introduction; Precautions; Power Switch - Liebert NXC 30kVA User Manual

Chapter 5 UPS Operation Introduction

This chapter introduces the operating precautions and daily operating methods of UPS in detail.

5.1 Brief Introduction

5.1.1 Precautions

The user can conduct relative operation only after the authorized engineer carries out the first power on and test.
1. 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.
2. The AC input and output terminals of UPS have dangerous voltage at any time. If the cabinet is equipped with an EMC filter, the
filter may have dangerous voltage.
1. For the control keys and LCD related to all the operating steps, refer to Chapter 4 Operator Control And Display
Panel.
2. During operation, the buzzer alarm may occur at any time. Press ALARM CLEAR key to silence the audible alarm.
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 returns 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.

5.1.2 Power Switch

Opening the front door of the UPS cabinet reveals the power switches, as shown in Figure 5-1, including:
Q1: Rectifier input switch, which connects UPS to the main circuit power.
Q2: Bypass input switch, which connects UPS to the bypass.
Q3: Maintenance bypass switch (locked), which supplies power to the load when UPS is being maintained.
Note: If the UPS system is composed of more than 2 paralleled UPS modules, do not use the internal maintenance
bypass switch.
Q5: Output switch, which connects UPS output to the load.
Q6: Neutral line switch (locked)
Warning: hazardous mains and/or battery voltage
Liebert NXC 30kVA And 40kVA UPS User Manual
Chapter 5 UPS Operation Introduction
Important
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