12
The bypass refers to the short-circuit wire that shall be used for disconnecting the
mains power and bypass on the terminal block when the mains power uses duplex
mains input, which is the short-circuit wire of the bypass input cable L and the mains
input cable L (1-phase in/1-phase out UPS), or the mains input cable C (3-phase
in/1-phase out UPS). The bypass input cable N and the mains input cable N shall be
short-circuited before connecting with the mains terminal N of the terminal block. The
bypass live wire and the mains live wire shall be connected according to the label of
the terminal block.
Output cable connection:
Connect output cables between UPS output terminals and important loads.
If loads are not ready to receive the power supply when commissioning engineers arrive at the
scene, please properly handle the safety insulation on the end of the system output cable.
External battery connection:
Please refer to the Chapter 4.5 in the EN50091-1 standard for battery connection.
The battery cabinets must have separate ground connection.
Connect battery cables between the (battery input +/-) battery terminals and the battery switches
of UPS. When connecting the cables between battery terminals and battery switches, connect
from the switch end first. Pay attention to the polarity of battery cables.
Reinstall all the protective cover plates.
3.4 Parallel UPS units
3.4.1 Redundancy introduction
N+X parallel redundancy is the most reliable power supply structure at present. N stands for the
minimum number of UPS required for total load. X stands for the number of redundant UPS, which is
the number of UPS failure that the system can bear all at once. The larger the X is, the more reliable
the system will be. N+X parallel redundancy is the best mode for the applications requiring extremely
high reliability.
3.4.2 Parallel units installation
The function of parallel operation is an optional function of UPS. Users can purchase the
components with the function of parallel operation (including parallel cards and parallel cables) by
themselves, and then contact customer service staff to install the components on the UPS.
Connect signal cables for parallel UPS units
Each UPS has 2 parallel cable ports (one is DB15male socket, and the other is DB15 female socket)
used for connecting two parallel cables. Two parallel cables play the role of redundancy. Keep the
cable paralleled as far as possible, so as to reduce the external interference on the parallel cables.
Take two parallel UPS units as an example. The wiring schematic diagram is shown as follows.
Summary of Contents for 6KVA
Page 1: ......
