Liebert Emerson NX UPS System - Manual (Page 84)

Technical Specifications
76
Table 36 Bypass mains input
Rated power, kVA
Unit of
Measurement
10 15 20 30
Rated AC Voltage 1 VAC
380/400/415 V
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
Overload Capacity %
135% long term
170% 10 min
1000% 100 ms
Upstream Protection,
Bypass Line (by others)
N/A
Thermomagnetic circuit breaker, rated up to 125%
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
bypass and inverter)
ms
Synchronous transfer: ≤1ms
Asynchronous transfer (default): 15 ms (50 Hz), 13.3 ms (60 Hz)
or 40, 60, 80, 100 ms, selectable
Bypass Voltage Tolerance % VAC
Upper limit: +10, +15 or +20, default +15
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.