Emerson Liebert NX User Manual download pdf (Page 84)

Technical Specifications

Table 36 Bypass mains input

Rated power, kVA

Unit of

Measurement

10 15 20 30

Rated AC Voltage

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

Hz 50 / 60

Transfer Time (between

bypass and inverter)

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.

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Emerson Liebert NX User Manual Page 84