Connecting I/O Cables-Dual-Input Configuration - Vertiv Liebert EXS Installer/User Manual

2.3.2 Connecting I/O Cables—Dual-input Configuration
Dual input configuration for the UPS requires that both input feeds be from the same solid N-G bonded
source.
1. Prepare to connect the UPS power cables to the I/O terminal block on the UPS rear panel, see
Figure 2.4 on the previous page:
• Remove the wiring access cover plate to gain access to the input and output terminal
blocks.
• Remove the conduit/cable entry area panel to punch holes for the conduit size needed,
and attach the conduits to the rear of the conduit plate.
2. Remove the factory-installed shorting bus bars in place in the UPS input terminal block.
3. Referring to Figure 2.4 on the previous page, make the following UPS rectifier-input hard-wire
cable connections from the upstream feeder panel to the UPS input terminal:
• Phase A to terminal 1 (rA)
• Phase B to terminal 3 (rB)
• Phase C to terminal 5 (rC)
• Neutral to terminal 7 (N)
• Ground to UPS ground bus bar (PE).
4. Referring to Figure 2.4 on the previous page, make the following UPS bypass-input hard-wire
cable connections from the upstream feeder panel to the UPS input terminal:
• Phase A to terminal 2 (bA)
• Phase B to terminal 4 (bB)
• Phase C to terminal 6 (bC)
• Neutral to terminal 8 (N)
• Ground to UPS ground bus bar (PE).
5. Referring to Figure 2.4 on the previous page, make the following UPS-output hard-wire
connections from the UPS output terminal to the downstream distribution panel:
• Phase A from terminal 1 to Phase A on panel-board main lug/breaker
• Phase B from terminal 2 to Phase B on panel-board main lug/breaker
• Phase C from terminal 3 to Phase C on panel-board main lug/breaker
• Neutral from jumper between terminals 4-5 to neutral bus on downstream panel.
• Ground from UPS ground bus bar (PE) to ground bus on downstream panel.
6. Torque all customer side connections per recommendations in Table 2.1 on page 23, and
Table 2.2 on page 23
7. Replace the wiring access cover plate and secure it.
2 Installation and Commissioning
25