Emerson Liebert NX 480V - Manual (Page 44)

UPS Specifications
36
5.4.2 DC Intermediate Circuit
See Table 8 for current ratings.
5.4.3 Inverter Output
See Table 8 for current ratings.
5.4.4 Bypass Input
Table 12 DC intermediate circuit
Rated Power kVA 40 60 80 100 120
Recommended number of lead-acid batteries
Total 40 battery blocks of 12VDC (240 cells of 2VDC)
will be supported by UPS
Recommended float charge voltage 2.27VDC *
Recommended boost charge voltage 2.4VDC *
Recommended end of discharge voltage 1.67 - 1.75 VDC
Maximum recharge battery current, A * 14.8 22.2 29.6 37.0 44.4
Maximum boost charge duration, min. * 1800
Boost-float threshold current, A * 0.1 C default
Temperature voltage compensation, mV/°C * From 0 to 5 mV/deg. C/cell. Default value is 3mV/deg. C/cell.*
Ripple voltage superimposed % ≤ 1
* Set by configuration software and based on usage of VLRA batteries.
Table 13 Inverter output
Rated Power kVA 40 60 80 100 120
Rated voltage, VAC 480
Supply 3-phase, 3-wire plus ground
Frequency, Hz 60 (50Hz in frequency converter mode)
Rated Power, kW 36 54 72 90 108
Three-phase transient overload,
min. load
105% to 110% for 60 minutes
111% to 125% for 10 minutes
126% to 150% for 1 minute
Voltage Regulation %
±1.0% three-phase RMS average for a balanced three-phase load
±2.0% three-phase RMS average for a 100% unbalanced load
Frequency Regulation %
Nominal frequency regulation is ±0.05% in single module mode,
and+/- 0.25% in parallel mode.
Maximum rate of change
of frequency, Hz/sec
For single mode, the slew rate is adjustable from 0.1Hz/s to 3Hz/s
Table 14 Bypass input
Rated Power, kVA 40 60 80 100 120
Rated voltage, VAC 480
Supply Three-phase, 3-wire plus ground
Bypass voltage tolerance %
Upper limit: +10%, +15% or +20%; Upper limit default: +15%
Lower limit: -10%, -20%, -30% or -40%; Lower limit default: -20%
Frequency, Hz 60
Input frequency tolerance % ±2.5%, ±5%, ±10% and ±20%; default ±10%
Bypass overload capacity
(all ratings)
Time
Long-term operation:
10 minutes:
100 milliseconds:
Load
<135% load
135% - 170% load
1000% full UPS rated output current
See Table 8 for current ratings.