4 bypass mode, 5 maintenance mode (manual bypass), 6 eco mode (single ups only) – Emerson Liebert NX 50 and 60 Hz User Manual
Page 91: 7 parallel redundancy mode (system expansion), 8 hot-standby mode, 9 frequency converter mode, 10 source share mode (co-generation), Bypass mode, Maintenance mode (manual bypass), Eco mode (single ups only)

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