NOTICE
Risk of improper power-supply connection. Can cause equipment damage and loss of warranty coverage.
Prior to connecting any equipment to a main or alternate power source (for example back-up generator
systems) for start-up, commissioning, testing, or normal operation, ensure that these sources are correctly
adjusted to the nameplate voltage and frequency of all equipment to be connected. In general, power-source
voltages should be stabilized and regulated to within +/- 10% of the load nameplate nominal voltage. Also, ensure
that no three-phase sources are single-phased at any time.
See transformer label for primary tap connections. Installer will need to change transformer primary taps if
applied unit voltage is other than pre-wired tap voltage.
NOTICE
Risk of improper electrical connection of three-phase input power. Can cause backward pump rotation and unit
damage. Service technicians should use a gauge set on the system during the initial start up to verify that the
three-phase power is connected properly. Three-phase power must be connected to the unit line voltage
terminals in the proper sequence so that the pump rotates in the proper direction. Incoming power must be
properly phased to prevent pump from running backward. We recommend checking the unit's phasing with
proper instrumentation to ensure that the power connections were made correctly. We also recommend
verifying discharge and suction pressures during start up to ensure that the pumps are running in the correct
direction.
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 600mm (24 in.) unit is on the inside of the display panel.
8.1 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 inch) units.
• Use only multi-polar cables with sheath (CEI20-22).
8.2 Wiring Connection Guidelines
• 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.
80 Proprietary and Confidential ©2024 Vertiv Group Corp. 8 Electrical Connections
Vertiv™ CoolPhase CDU Installer/User Guide
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