Chapter 6 Operating Instructions
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MUST400_User manual_EN_REV02 User Manual
Chapter 6 Operating Instructions
Warning-Hazardous mains voltage and/or battery voltage
present(s) behind the protective cover
The components that can only be accessed by opening the protective cover with tools cannot be operated
by user. Only qualified service personnel are authorized to remove such covers.
6.1 Introduction
The Modular UPS operates in the following three modes listed in table.6-1. This section describes various
kinds of operating procedures under each operating mode, including transfer between operating modes, UPS
setting and procedures for turning on/off inverter.
Tab.6-1: UPS Operating mode
Operating mode
Descriptions
Normal mode
UPS powers the load
Bypass mode
The load is supplied by the static bypass line. This mode can be regarded as a
temporary transition mode between the normal mode and maintenance bypass
mode, or a temporary abnormal operating status
Maintenance
mode
UPS Shuts down, the load is connected to the mains via Maintenance bypass.
NOTE: in this mode the load is not protected against abnormal mains
Note:
1. Refer to Chapter 7 Operator Control and Display Panel, for all the user operating keys and LED displays.
2. The audible alarm may annunciate at various points in these procedures.
3. The UPS function can be set via maintenance software. However, the setting and commissioning must be
done by trained maintenance engineers.
6.1.1 Power Switches
The UPS rack system has a maintenance bypass breaker, a main input breaker and an output breaker. All the
other transfers are processed automatically by internal control logics.
6.2 UPS Startup
Do not start the UPS until the installation is completed, the system has been commissioned by authorized
personnel and the external power isolators are closed.
警告
危 险
