102 Chapter 7 Parallel System And LBS System
Liebert EXM 80kVA ~ 200kVA UPS User Manual
7.2.5
Parallel Cable
Shielded and double-insulated parallel cables available in lengths 5m, 10m and 15m must be
interconnected in a ring configuration between the UPS modules, as shown in Figure 7-2. Method: connect
a module parallel cable from its PARA1 port to the PARA2 port of another module. Follow this method to
connect other parallel cables.
The parallel port J20 is provided on the front panel of the bypass module, as shown in Figure 7-3.
The ring connection ensures the reliability of the control of the parallel system. Be sure to verify the
reliable cable connection before starting up the system!
UPS 1
UPS 2
UPS 3
UPS 4
LBS 1
PARA 1
LBS 2
PARA 2
LBS 1
LBS 2
PARA 1
PARA 2
LBS 1
LBS 2
PARA 2
LBS 1
LBS 2
PARA 1
PARA 2
PARA 1
UPS 1
LBS 1
LBS 2
PARA 1
PARA 2
UPS 2
LBS 1
LBS 2
PARA 1
PARA 2
UPS 3
LBS 1
LBS 2
PARA 1
PARA 2
UPS 4
LBS 1
LBS 2
PARA 1
PARA 2
Figure 7-2 Parallel signal cables connection (Parallel system)
J20
Figure 7-3 Location of parallel port J20 on bypass module
7.2.6
Remote EPO
In addition to the EPO switch provided on the operator control and display panel of each UPS module for
controlling the EPO of each module respectively, the parallel system also provides remote EPO function
for controlling all UPS modules to shut down simultaneously from a remote terminal, as shown in Figure
7-4.
Note
1. The remote EPO switch must provide dry contact signal, which is normally open or normally closed.
2. The open circuit voltage provided is 12Vdc, < 20mA.
3. The external EPO device can be composed of another control system which can disconnect UPS mains supply or
bypass input.
4. Pins 1 and 2 of the normally closed EPO-J2 port on the bypass module have been linked in factory.
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