Emerson 250 Manuel D’Utilisation
Specifications
25
Notes on Tables
1. Nominal input current (considered continuous) is based on full-rated output load. Maximum
current includes nominal input current and maximum battery recharge current (considered
noncontinuous). Continuous and noncontinuous current are defined in nec 100. Maximum input
current is controlled by the current limit setting which is adjustable. Values shown are for
maximum setting of 125%. Standard factory setting is 125%.
2. Recommended bypass external overcurrent protection is based on 125% overload capacity for 10
minutes.
3. All recommended external overcurrent protections are based on 80% rated breakers.
4. Nominal battery voltage is shown at 2.0 volts / cell.
4. Nominal battery voltage is shown at 2.0 volts / cell.
Table 7
Liebert NXL system and inverter efficiencies
UPS Rating
Voltage, VAC
System Efficiency
Inverter Efficiency
kVA
kW
Input
Bypass
Output
100%
50%
100%
50%
250
225
480
480
480
93.9
93.2
94.8
94.1
300
270
480
480
480
94.0
93.3
94.9
94.2
400
360
480
480
480
94.2
93.4
95.1
94.4
Table 8
Current ratings—rectifier input
UPS Rating
Voltage, VAC
Nominal
Current
Maximum
Current
External
100% Breaker
Trip, Amps
External
80% Breaker
Trip, Amps
kVA
kW
Input
Bypass
Output
250
225
480
480
480
313
392
400
500
300
270
480
480
480
376
469
500
600
400
360
480
480
480
500
625
700
800
Table 9
Current ratings—bypass input
UPS Rating
Voltage, VAC
Nominal
Current
10 Minute
Overload
External Breaker
Trip, Amps
kVA
kW
Input
Bypass
Output
250
225
480
480
480
301
376
400
300
270
480
480
480
361
451
500
400
360
480
480
480
481
601
700
Table 10
Current ratings—output
UPS Rating
Voltage, VAC
Nominal
Current
10 Minute
Overload
External Breaker
Trip, Amps
kVA
kW
Input
Bypass
Output
250
225
480
480
480
301
376
400
300
270
480
480
480
361
451
500
400
360
480
480
480
481
601
700
Table 11
Current ratings—battery
UPS Rating
Nominal
VDC
Max Battery
Current at EOD
External Breaker
Trip, Amps
kVA
kW
250
225
480
615
700
300
270
480
737
800
400
360
480
981
1000