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5.2.6
Intermodule Control
Two kinds of signals are used for the parallel cables:
• Analog signals—UPS output unbalanced current
• Digital signals—control logic signals, parallel cable status
Parallel control cables should be connected to the parallel board (M3) of all modules and form a ring to
provide redundancy as shown in Figure 20.
Two types of Parallel control cables needed:
• DB9 for analog signals with one end DB9/F and one end DB9/M
• DB25 for digital signals with one end DB25/F and one end DB25/M
These come in lengths of 5m, 10m and 15m.
5.3
Installing Parallel System
The basic installation procedure of parallel system is the same as that of single module system. The
following sections introduce only the installation procedures specific to the parallel system.
5.3.1
Cabinet Installation
Parallel system composed of two UPS modules
The two UPS modules that will form the 1+1 system should be placed side-by-side. Each battery cabi-
net is placed next to its corresponding UPS module.
5.3.2
Preliminary Checks
Each UPS module should have the same rating, the same firmware and the same hardware version.
Refer to the instructions in 5.2.2 - Conditions for Parallel System.
5.3.3
Protective Devices
Refer to the instructions supplied in the Liebert NX installation manual, SL-25215.
5.3.4
Power Cables
Wiring of power cables is similar to that of single module system (See the Liebert NX installation
manual, SL-25215. The bypass sources of all modules should be the same, and the outputs should be
connected altogether correctly.
NOTE
The length and specifications of power cables including the bypass input cables and UPS
output cables should be the same, thus the load can be shared evenly in bypass mode.
5.3.5
Parallel Control Cables
Make the connections listed below on the parallel logic board (M3) inside the Liebert NX. (See
Figure 25 for the location of the parallel logic board):
• Connect one end of the DB-25 interconnecting cable the X2_1 connector of the first Liebert NX
and the other end to the X2_2 connector of the second Liebert NX.
• Connect one end of the DB-25 interconnecting cable the X2_2 connector of the first Liebert NX
and the other end to the X2_3 connector of the second Liebert NX.
• Connect one end of the DB-9 interconnecting cable the X1_1 connector of the first Liebert NX and
the other end to the X1_2 connector of the second Liebert NX.
• Connect one end of the DB-25 interconnecting cable the X1_2 connector of the first Liebert NX
and the other end to the X1_3 connector of the second Liebert NX.
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