Chapter 1 Installation
8
Shield M10U user manual
Reserved
entry hole
(b)
6-module cabinet cables entry
Fig.1- 4: cable entry
Notes
Cables connection should be followed as diagram on rear panel or
appendix B (2-module and 4-module cabinet)
Fix cables in 6-module cabinet as Fig.1-4(b) to make sure best ventilation.
Enter through reserved entry cover if ellipse holes are not big enough, and block the remained space to protect UPS
from rats.
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 regulatory wiring standards, and of 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. Split bypass: In case
a split bypass is 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.
Protection against earth faults (RCD devices):
The RCD device installed upstream of the input supply should:
警告
危 险
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