60
User Manual 10H52267UM60 - Rev. 1 - 09/2018
EXS
Input power
supply
Mains input
L1,L2,L3,N
BCB
Battery 1
Rectifier
Charger
Inverter
Static
switch
Q1
Q5
QE1
QOP
L1, L2,L3,N
Q3
Output distribution
Q2
External
bypass switch
E
xt
e
rn
a
l
m
a
in
te
n
a
n
ce
b
yp
a
ss
Mains input
L1,L2,L3,N
BCB
Battery 2
Rectifier
Charger
Inverter
Static
switch
Q1
Q5
QE2
QBP
L1, L2,L3,N
Q3
Q2
To load
UPS 1
UPS 2
Figure 6-1
Circuit diagram of a typical parallel system (with common input, separate batteries and output)
6.3.3
Power Cables
The power cable wiring is similar to that of the UPS module. Refer to
3.1 Power Cable Wiring
.
The bypass and main input supplies must use the same neutral line input terminal. If the input is fitted with a current
leakage protection device, the device must be fitted upstream of the neutral line input terminal
.
Note
1. The power cables (including the bypass input cables and UPS output cables) of each UPS module should be of the same length
and specifications to facilitate load sharing.
2. The UPS uses either common input or separate bypass configuration. If the mains and bypass inputs are derived from two
different transformers, then these two transformers should be connected to the same earth network.
6.3.4
Parallel Cables
Shielded and double-insulated parallel cables, which are available in lengths of 5 m, 10 m and 15 m, must be
interconnected in a ring configuration between the UPS modules, as shown in Figure 6-2. Method: connect a parallel
cable between the PARALLEL1 port on one module and the PARALLEL2 port on the next module. Repeat this step for
all the other parallel cables.
The ring connection ensures the reliability of the parallel control system. Be sure to verify that the cables are
connected securely before starting up the system!
Figure 6-2
Parallel cable connections
