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Installation
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4.2.2 DC Power Connections
The instructions for installation of DC power connections vary according to the type of UPS intercon-
nection kit integrated into your Liebert FS unit. Follow the installation instructions in Appendix
A.0 - UPS Interconnection Kits for the relevant UPS interconnection kit installed in your unit.
4.2.3 Status/Control Connections
The instructions for installing Status/Control connections vary according to the type of UPS intercon-
nection kit that is integrated into your Liebert FS. Follow the installation instructions in Appendix
A.0 - UPS Interconnection Kits for the relevant UPS interconnection kit installed in your unit.
4.2.4 Ground Connections
A ground connection is available on the Liebert FS (see Figure 29). The electrical contractor must
ensure that the Liebert FS is effectively grounded to UPS chassis or UPS ground terminal. The
ground connection must be as short as possible. The maximum ground wire size is 1/0 AWG - 600VDC
wire (54mm
2
wire section). Wire size and installation must comply with all applicable local, regional
and national regulations (e.g., National Electric Code for USA). Check all connections with Multi-
meter to verify ground continuity. (Refer also to Appendix E.1 - Ground Test Procedure.
Figure 29 Ground connection on the Liebert FS
The tightening torque for the ground connections must be in accordance with Table 3. Use these val-
ues unless the equipment is labeled with a different torque value.
!
CAUTION
Ensure that all grounds are secure and free of corrosion. Proper grounding is necessary for
optimum performance, safety and reliability.
Table 3 Tightening torque for ground connection
Ground Wire Gauge Tightening Torque
AWG
Approximate metric
equivalent wire section (mm
2
)
Inch-
pounds N-m
4 21 110 12
2 34 150 17
1 42 150 17
1/0 54 180 20
Ground Terminal
Locations (DC
ground and filter
caps if required)
Side panel
removed for
clarity.
DISCONTINUED
PRODUCT