Electrical INSTALLATION Liebert Trinergy™ Cube
Installation Manual - 10H52243IM60 - rev. 7 - 06/2020 Page 75
4. ELECTRICAL INSTALLATION
4.1. System and protective earthing
The purpose of this appendix is to describe the system and protective earthing principles of the Liebert
Trinergy
TM
Cube.
Caution: All wiring must be in accordance with applicable national and/or local electrical wiring rules.
4.2. TN power distribution systems
TN power distribution systems are directly earthed, the parts of the equipment that need to be earthed
are connected using PROTECTIVE EARTHING CONDUCTORS. Three types of TN power
distribution systems are considered:
• TN-S power distribution system, in which a separate protective conductor is used throughout the
system;
• TN-C-S power distribution system, in which neutral and protective functions are combined in a
single conductor in part of the system;
• TN-C power distribution system, in which neutral and protective functions are combined in a
single conductor throughout the system.
Some TN power distribution systems are supplied from a secondary winding of a transformer that has
an earthed center tap (neutral). Systems in which the two-phase conductors and the neutral conductor
are available are commonly known as "single-phase, three-wire power distribution systems."
The two diagrams show the Liebert Trinergy
TM
Cube installed in two different TN systems:
• Earthing arrangements and protective conductors - Liebert Trinergy
TM
Cube in “TN-S installation”
• Earthing arrangements and protective conductors - Liebert Trinergy
TM
Cube in “TN-C installation”
(see Fig. 86 - on page 77 and Fig. 88 - on page 79 - LEGEND: color lines identification blocks):
• UPS -> black I/O BOX -> red
• CORE -> blue STATIC SWITCH -> green
• CORE DISCONNECTOR -> magenta
Warning
For safety reasons the second access panels may be removed only by authorized personnel in
accordance with the safety instruction and procedure.
Any operation performed without following the safety rules can cause serious injuries and damage
the equipment. The UPS is connected to 400/230 V three-phase power lines; DC voltages above 500
V are also found in the battery circuit. Installation must only be carried out by qualified personnel in
accordance with these operating instructions and both national and local electrical codes.
Since UPS devices create a large leakage current, connect the device to ground before
commissioning. Improper connection can damage the device and lead to injuries and even death.
Warning
With regard to electromagnetic conformance, the device was developed in accordance with product
standard IEC/EN 62040-2. If the overvoltages on the UPS power line exceed the test limits specified
in IEC/EN 62040-2, appropriate surge protection devices (SPD) must be installed. Overvoltages in
the power supply system may occur for several reasons, including lightning strikes, ON/OFF
switching of inductive or capacitive loads (such as power transformers or capacitor banks), and
short-circuit shutdowns.
Notice
QS2 and QS4 are used for disconnecting.
Do not operate battery switch QS9 when the inverter is ON.
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