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3.2.1 LAN I/F: The communication port for connecting RS-232 cable from UPS to
computer.
3.2.2 UPS OUTPUT: The output outlets for connecting loads to the UPS backup
power system (available in NB-series UPS only).
3.2.3 INPUT CABLE: The cable to connect to utility power line.
3.2.4 INPUT FUSE: The overload or short circuit protection at UPS input side.
3.2.5 OUTPUT FUSE: The overload or short circuit protection at UPS output side.
3.2.6 NO LOAD SHUT DOWN SWITCH: The switch to enable automatic shutdown
when there is no load and power fails. (No load means the total power
consumption of all loads are lower than 10% of full load).
3.2.7
BATTERY circuit breaker: The circuit breaker for protecting battery from over
load or short circuit current.
3.2.8 INPUT circuit breaker: The circuit breaker for protecting the UPS from over
load or short circuit current.
3.2.9 INPUT TERMINAL: The terminal for connecting power from utility line to the
UPS.
3.2.10 OUTPUT TERMINAL: The terminal for connecting to loads.
3.2.11 GROUND: The terminal for connecting to ground system.
3.2.12 MAINTENANCE BYPASS SWITCH (option): Turn this switch to position B when
UPS is under maintenance.
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INSTALLATION
Model
Input cable (mm
2
)
Output cable (mm
2
)
Earth cable (mm
2
)
Battery cable (mm
2
)
NB2K25
2.5-4
1.5-2.5
2.5-4
-
NBP-3K25
4
2.5
2.5-4
-
NBP-5K25
6
4
4
-
NBP-6K25
6
6
6
-
NBP-0811
10
6-10
6
6
NBP-1011
16
16
10
6-10
4.1 Connect the RS-232 signal cable from the computer (if any) to the UPS at LAN I/F or
RS232-PC port.
4.2 Enable NO LOAD SHUTDOWN feature. Slide NO LOAD SHUTDOWN switch to
position ON. When power fails, the UPS will check whether the load is equal to 9%
or lower. If it is, the UPS will shut down to save battery power.
Note: The factory default setting is OFF or disabled.
4.3 For NB7525 and NB 1K25; plug INPUT CABLE to utility power source. Then, plug
loads' cables to the UPS OUTPUT sockets.
4.4 Cable size for installing NB 2K25, and NBP-series.
Note: If the cable is longer than 5 meters, the cable size must be increased.
4.5 For NB 2K25; connect the cable from INPUT TERMINAL to utility power source. Then,
connect the cable from OUTPUT TERMINAL to loads as shown in Figure 1. Please
refer to the cable sizing in 4.4.
Figure 1