Chapter 1 Installation
MUST400_User manual_EN_REV02 User Manual
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Fig.1- 2: Power Module Installation Diagram
1.4.9 Cable Entry
Cables can enter into the UPS system both from bottom and top. Cable entry is made possible through a
blanking plates fitted at the bottom or top of the equipment. The recommended installation practice is to install
glands to prevent foreign material entering into the cabinet.
1.5 External Protective Devices
For safety concerns, it is necessary to install external circuit breakers or other protective devices for the input
AC supply of the UPS system. This section provides generic practical information for qualified installation
engineers. The installation engineers should have the knowledge of the wiring standards, and the equipment
to be installed.
1.5.1 Rectifier and Bypass Input Supply of the UPS
Over currents
Install suitable protective devices in the distribution unit of the incoming mains supply, considering the power
cable current-carrying capacity and overload capacity of the system (see Tab. 9-7). Generally, the magnetic
circuit breaker with IEC60947-2 tripping curve C (normal) at the 125% of the current listed in Tab. 9-7 is
recommended.
Dual input: In case of split bypass used, separate protective devices should be installed for the rectifier input
and bypass input in the incoming mains distribution panel.
Note: The rectifier input and bypass input must use the same neutral line.
So don’t remove the neutral common copper br
idge present between input and bypass terminals