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All the parallel cables are designed to be shielded and double insulated, and are
connected between the UPS to form a loop as shown below in Fig.5-5.
Fig.5-5 Parallel connection
5.5.2 Parallel system setting
Parallel system connection
For field installation, please connect the cables according to Fig.5-6 and Fig.5-8.
In order to assure that all units are equally utilized and to comply with relevant
wiring rules, the following requirements apply:
1. All units shall be of the same rating and must be connected to the same bypass
source.
2. The bypass and the main input sources must be referenced to the same neutral
potential.
3. Any RCD (Residual Current detecting device), if installed, must be of an
appropriate setting and located upstream of the common neutral bonding point.
Alternatively, the device must monitor the protective earth currents of the system.
Refer to the High Leakage Current Warning in the first part of this manual.
4. The outputs of all UPS must be connected to a common output bus.
Parallel system software setting
To change the parallel system setting, please follow the steps below.
1. With the monitoring software from manufacturer, select the page of
“
Settings
” as below,
Summary of Contents for EA990 G5 10
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