Liebert NX UPS System user manual Bypass mains input

Technical Specifications

Table 36 Bypass mains input

Rated power, kVA	Unit of	10		15		20	30
	Measurement
Rated AC Voltage 1					380/400/415 V
	VAC	three-phase four-wire, sharing neutral with the rectifier input
			and providing neutral reference to the output
Rated Current
380V	A	15		23		30	45
400V	A	15		22		29	43
415V	A	14		21		28	42
				135% long term
Overload Capacity	%				170% 10 min
					1000% 100 ms
Upstream Protection,	N/A		Thermomagnetic circuit breaker, rated up to 125%
Bypass Line (by others)			of nominal output current. IEC 60947-2 curve C.
Current Rating of Neutral Cable	A				1.7 x In
Frequency 2	Hz				50 / 60
Transfer Time (between				Synchronous transfer: ≤1ms
	ms	Asynchronous transfer (default): 15 ms (50 Hz), 13.3 ms (60 Hz)
bypass and inverter)
				or 40, 60, 80, 100 ms, selectable
			Upper limit: +10, +15 or +20, default +15
Bypass Voltage Tolerance	% VAC		Lower limit –10, -20, -30 or -40, default: -20
		(delay time to accept steady bypass voltage: 10 sec)
Bypass Frequency Tolerance	%			± 2.5 ± 5 ± 10 or ± 20 default ±10
Synchronisation - Window	Hz		Rated frequency ±2Hz (selectable ± 0.5 to ±3Hz)

1.Factory set to 400V – 380 or 415V selectable by commissioning engineer.

2.Factory set to 50Hz; 60 Hz selectable by commissioning engineer. Bypass condition ignored when UPS set as frequency converter.

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