Chapter 2 Installation
11
The residual current circuit breaker (RCCB) must be sensitive to the DC unidirectional pulse (level A) in distribution
network, but insensitive to the transient current pulse, as shown in Figure 2-6 respectively.
Figure 2-6 RCCB symbols
When using the earth RCD in split-bypass system or parallel system, the RCD should be located at the upstream
input distribution terminal to avoid generating the false alarm.
The earth leakage current introduced by the RFI filter in the UPS ranges from 3.5mA to 1000mA. It is recommended
to confirm the sensitivity of each differential device of the upstream input distribution and downstream distribution (to
load).
2.5.2 Battery Input
The overcurrent protective device has been placed into the battery module, when you choose the battery module
options provided by Emerson. Otherwise, the external battery cabinet should provide DC compatible circuit breaker,
so as to provide the overcurrent protection for the UPS and its batteries.
2.5.3 UPS Output
The protective device must be installed for the UPS output distribution. The protective device must be different from
the input distribution protection switches, and it also provides the overload protection (see Table 1-2).
2.6 Connecting Power Cables
I/O cables and battery cables are required for connection. Battery modules provide the battery cable options.
When designing the cables, you should follow the instructions in this section and the local wiring regulations, take the
environment situation into account, and refer to Table 3B of IEC60950-1.
Warning
1. Before carrying out the UPS wiring, ensure that you have learned about the location and state of the UPS input and mains
distribution switch. Make sure that the switches are in open state, and put up the warning mark to prevent the switches from
operating by others.
2. Failure to follow adequate earthing procedures can result in electromagnetic interference, electric shock hazard to personnel,
and risk of fire.
2.6.1 Cables Selection
Select the cables according to Table 2-2.
Table 2-2 Maximum steady state AC and DC current
UPS rated
power (kVA)
Rated current (A)
Mains input current
1
,
2
upon battery
charging with Max ability
Gross output current
2
at full load
Battery discharging current upon
Min battery voltage
380V
400V
415V
380V
400V
415V
20 (3-in 3-out)
36
36
36
30
29
28
67
20 (3-in 1-out)
36
36
36
90
87
84
67
Note:
1. The mains current input of the rectifier and bypass.
2. Non-linear load (switch mode power) affects the neutral cable design of output and bypass. The neutral cable current may
exceed the rated phase current, in general, 1.732 times the rated current
Summary of Contents for Adapt
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