Chapter 3 Installation Of Parallel System 25
NXr UPS Module And Parallel System 30kVA ~ 200kVA User Manual
3.2.4 Auxiliary Control Wiring
Auxiliary wiring must be installed as shown in Figure 3-4 to protect the system and enable a single UPS to be isolated
and tested during service. Refer to
1.7.3 Maintenance Switch And Output Switch State Port
for auxiliary contact
details.
Input distribution
UPS 3
J9
1 4 3
UPS 2
J9
1 4 3
UPS 1
J9
1 4 3
Q1Ext
Q2Ext
QByp
QUPS
Q2Ext
Distribution panel
To load
Figure 3-4 Auxiliary control wiring
3.2.5 Parallel Control Cables
Shielded and double-insulated parallel control cables available in lengths 5m, 10m and 15m must be interconnected
in a ring configuration between the UPS modules, as shown in Figure 3-5. The parallel ports J2 and J3 are provided
on the front panel of the bypass module, as shown in Figure 3-6. 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.
J2
J3
UPS 1
J2
J3
UPS 2
J2
J3
UPS 3
J2
J3
UPS 4
Figure 3-5 Connection of parallel control cables of 1+N parallel system
Summary of Contents for Liebert NXr
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