7 ELECTRICAL CONNECTIONS
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power
disconnect switches, verify with a voltmeter that power is Off and wear personal protective
equipment (PPE) per NFPA 70E before working within the electric control enclosure. Failure to
comply can cause serious injury or death. Customer must provide earth ground to unit, per
NEC, CEC and local codes, as applicable. Before proceeding with installation, read all
instructions, verify that all the parts are included and check the nameplate to be sure the
voltage matches available utility power. The Liebert controller does not isolate power from the
unit, even in the “Unit Off” mode. Some internal components require and receive power even
during the “Unit Off” mode of the controller. The factory-supplied, optional disconnect switch
is inside the unit. The line side of this switch contains live high-voltage. The only way to ensure
that there is NO voltage inside the unit is to install and open a remote disconnect switch. Refer
to unit electrical schematic. Follow all local codes.
WARNING! Risk of electric shock. Can cause equipment damage, injury or death. Open all local
and remote electric power supply disconnect switches and verify with a voltmeter that power is
off before working within any electric connection enclosures. Service and maintenance work
must be performed only by properly trained and qualified personnel and in accordance with
applicable regulations and manufacturers’ specifications. Opening or removing the covers to
any equipment may expose personnel to lethal voltages within the unit even when it is
apparently not operating and the input wiring is disconnected from the electrical source.
Before proceeding with the electrical connections, ensure that:
• all electrical components are undamaged
• all terminal screws are tight
• the supply voltage and frequency are as indicated on the unit
NOTE: The serial tag on the 600 mm (24 in.) unit will be found on the inside of the display panel. The
serial tag on the 300 mm (12 in.) units will be on the narrow side of the electric panel, nearest the filters.
7.1 Power-supply Cable-connection Guidelines
• Connect the cable to the line inlet terminal board.
• Use the appropriate cable size for the current draw, supply voltage and installation type.
• Protect the supply using a backup fuse or circuit breaker.
• Do not fit the supply cable in the raceways inside the unit’s electric board—600 mm (24 in.)
units.
• Use only multi-polar cables with sheath (CEI20-22).
7.2 Wiring Connections
• Remote On/Off connections must be provided by the installer.
• The General Alarm terminals allow remote alarm signaling.
In case of short circuit, check the affected switch for sticking and replace it if necessary.
Vertiv | Liebert CRV Installer/User Guide | 73
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