Eaton 93E MK2 Installation And Operation Manual page 23

UPS Installation Plan and Unpacking
• 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 same as those for single systems.
• 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.
• MBS (Maintenance bypass switch) is installed inside the UPS. When maintaining, open neutral switch and MBS to
isolation the UPS internal parts from the utility. Do not open neutral switch in any other cases because the neutral is
required for UPS 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 energizing 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 4-4 shows Power terminal location 10/15/20/30 kVA
Figure 4-5 shows Power terminal location 40 kVA
13 Eaton 93E MK2 UPS (10-40kVA, 380/400/415V) Installation and Operation