UPS (1
piece)
Battery
module
(4
pcs)
Figure 2-5 UPS installation diagram of battery modules included
2.5 External Protective Device
The circuit breaker or other protective devices must be installed at the external AC input port of the UPS. This section
provides the general guidance for qualified installation engineer. The qualified installation engineer should learn about
the local wiring regulations for the equipment to be installed.
2.5.1 Rectifier And Bypass Inputting
O
v
e
r
c
u
rr
e
n
t
The appropriate overcurrent protective device should be installed on the mains input distribution, and the current
capacity of power cable and the system overload requirements should be taken into account in installation (see Table
1-2). It is generally recommended to use the thermomagnet circuit breaker of IEC60947-2 tripping curve C (normal),
when the current value reaches 125% of the current value listed in Table 2-2.
Split-bypass: When the system adopts split-bypass, the protective devices should be respectively installed at the
mains input distribution for mains and bypass.
Main/Bypass
reflected
p
r
o
t
e
c
t
i
on
When using the main/bypass reflected protection function, the gross mains input needs to be equipped with the
protective device with auxiliary contact function. The recommended model is S1N125 R125 TM FFC 4P + 1A + 1B +
YO (220Vac).
Note
The same neutral must be used for the rectifier and bypass power.
For IT power grid system, the protective device with four poles must be installed at the UPS external I/O distribution.
Earth leakage
c
u
rr
e
n
t
The residual current detector (RCD) for the UPS upstream input distribution should be:
•
Sensitive to the DC unidirectional pulse (level A) in distribution network
•
Insensitive to the transient current pulse
•
General sensitivity type, settable: 0.3A ~ 1A
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