Eaton 9EHD Series, User'S Installation And Operation Manual

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• The bypass feed into this equipment uses four wires (three line conductors and neutral conductor), plus
grounding conductor (protective earthing conductor) . The rectifier feed into this equipment uses four wires
(three line conductors and neutral conductor), plus grounding conductor (protective earthing conductor). The
phases must be symmetrical about ground (from a Wye/Star source) for proper equipment operation.
• Parallel UPS input wiring size requirements and output wiring size requirements from the UPSs to the Tie
Cabinet are the sames as those for single systems.
• This device is not equipped with its own mains separation device. It is , therefore, essential that the customer
install such a device at the installation site near the UPS.
• Install a proper three-pole overcurrent disconnect device before connecting to the UPS, the disconnect
device shall disconnect simultaneously all line conductors of the AC MAINS SUPPLY.
• Do not disconnect neutral, neutral required for system operation.
• If a disconnect device interrupts the neutral conductor, it shall simultaneously interrupt all line conductors.
• When single-phase current exceeds 100A, switches of protective atmosphere should be equipped with
arc-control device.
• The UPS requires an input neutral connection. Ensure that an input neutral is connected prior to energising
the UPS. If a 4 pole Automatic Transfer Switch is installed upstream of the UPS it must work with a break
before make transition with a minimum transfer time of 50ms.
Figure 4-6 and Figure 4-7 show the location of the UPS power cable terminals.
Eaton 9EHD UPS (20-40 kVA, 380/400/415V) Installation and Operation Manual 15