28 Chapter 3 Electrical Installation
Liebert EXM 80kVA ~ 200kVA UPS User Manual
Refer to Figure 3-2 ~ Figure 3-5, open the front door of the UPS to reveal the power cable connection
terminals (see Figure 3-2). Connect the protective earth cable to the PE input terminal in the cabinet.
Warning
1. The earth cables and neutral line must be connected in accordance with local and national codes of practice.
2. Failure to observe this could result in electric shock or fire risk.
Connection of system input
1. Common input configuration
Connect the AC input cables to the bypass input terminals (bA-bB-bC) in the cabinet, and connect the
input neutral line to the neutral terminal N in the cabinet. Ensure correct phase rotation.
2. Split bypass configuration
Remove the shorting copper bar of common input configuration, see Figure 3-2. Connect the rectifier
input cables to the rectifier input terminals (mA-mB-mC) in the cabinet, and connect the bypass input
cables to the bypass input terminals (bA-bB-bC) in the cabinet. Connect the rectifier input neutral line
and bypass neutral line to the neutral terminal N in the cabinet. Ensure correct phase rotation.
Connection of system output
Connect the system output cables between the output terminals (oA-oB-oC-N) in the cabinet and the
load. Refer to Table 3-1 for the torque value. Ensure correct phase rotation.
Warning
If there is no requirement of power supply for the load before arrival of the service engineer, ensure that the system
output cables are safely isolated at their ends.
Connection of batteries
Ensure correct polarity of the connections from the battery string terminals to the BCB and from the BCB
to the battery input terminals (BAT+, BAT N, BAT-) in the UPS cabinet, that is, (BAT+) to (+) and (BAT-)
to (-), (BAT N) to (N), but disconnect one or more battery cell links in each tier. Do not reconnect these
links and do not close the BCB before authorized to do so by the service engineer.
Note: When connecting the cables between battery terminals and BCB, the connection should begin
from the BCB terminal.
Now the connection is finished.
Note
After connection, take appropriate measures to seal the cable entry holes.
3.2
Wiring Of Signal Cable
3.2.1
Overview
For on-site specific needs, the UPS needs auxiliary connection to realize battery system (including the
external battery switch) management, communicate with PC, provide alarm signal to external devices,
realize remote EPO or provide bypass back feed circuit breaker signal and parallel communication. These
functions are realized through the communication box in the UPS cabinet. As shown in Figure 3-6, the
communication box provides the following ports.
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