Mô tả

Liebert ups

Liebert UPS shall operate as an online reverse transfer system in the following modes:

Normal: The UPS inverter continuously supplies the critical AC load. The rectifier draws power from the commercial AC source and converts it into DC power for the inverter and the battery charger. The battery charger maintains the battery in a fully charged and optimum operational condition. The inverter converts the DC power into clean and regulated AC power which is supplied to the critical load (conditioned line).

ECO Mode: The critical AC load shall be continuously powered by the bypass with the inverter available to power the load if the bypass source voltage or frequency exceeds adjustable parameters of power quality. This feature shall also be available in parallel operation.

Battery: Upon failure of utility AC power, the critical load shall be powered by the inverter, which, without any switching, shall obtain its power from the battery plant via the DC-DC converter. There shall be no interruption in power to the critical load upon failure or restoration of the utility AC source.

Recharge: Upon restoration of the utility AC source, the rectifier shall supply power to the output inverter and to the DC-DC converter, which shall simultaneously recharge the batteries. This shall be an automatic function and shall cause no interruption to the critical load.

Bypass: If the UPS must be taken out of service, the static transfer switch shall transfer the load to the bypass source. The transfer process shall cause no interruption in power to the critical load. An optional external wrap-around maintenance bypass shall be used to ensure full isolation of the unit for the service of internal components while providing safety from arc flash.

Parallel: Inherent scalability features should be available to meet higher capacity and higher reliability requirements. Under normal operating conditions, the power delivered to the load will be equally shared between number of UPS units connected to the parallel bus with a tolerance of 5%. In the event of a unit failure or overload, the system will transfer to the bypass source.

 Input Liebert ups

A. Voltage: Input/output voltage specifications of the UPS shall be

• Rectifier AC Input: 380/400/415V, three-phase, four-wire-plus-ground (Also compatible with 3-wire system)

• Bypass AC Input: 380/400/415V, three-phase, four-wire-plus-ground

• AC Output: 380/400/415V, three-phase, four-wire-plus-ground

A. Voltage Range: 305-478 at full at full load; 228 – 478 at 50% derated load conditions without battery discharge

B. Frequency Range: 40 – 70Hz

C. Maximum Inrush Current: UPS inrush current not to exceed 1.5 times rated input current

D. Power Factor: Minimum 0.99 at full load with nominal input voltage

E. Current Distortion: Less than 3% THD at full load input current in double-conversion mode

F. Surge Protection: Sustains input surges of 4kV (Line to ground) without damage as per criteria listed in EN 61000-4-5: 1995

G. Power Walk-in Period: selectable 5 through 30 seconds in 5 seconds intervals

 AC Output

H. Load Rating: 100% of load rating for any load from 0.7 lag to 0.8lead

I. Voltage Regulation:

• ±1% RMS average for a balanced, three-phase load

• ±2% for 100% unbalanced load for line-to-line imbalances

J. Voltage Adjustment Range: ±5% for line drop compensation adjustable by factory service personnel

K. Frequency Regulation:

• Synchronized with internal clock: ±0.05%

L. Frequency synchronization window: Synchronized to bypass: Nominal ±5% Hz

M. System Efficiency: defined as output kW/input kW at rated lagging load power factor; and not less than
the values listed below

In Double conversion mode: 95.6% at 100% Load, >96.2% at 75-40% Load, 95.6%at 20% load, & >93.5% at 10% load.

In Eco Mode: Up to 99.2%

N. Phase Imbalance:

• Balanced loads 120° ±1°

• 100% unbalanced loads 120° ±1.5°

O. Voltage Transients (average of all three phases):

• 0-100% or 100-0%

Response Meets IEC 62040-3: 2010 Figure 2 Curve 1, Class 1

Meets ITIC and CBEMA Curve Requirements

• 10-100% or 100-10%

Transient Voltage Deviation, RMS 5%

P. Inverter Overload Capability:

105% continuous

105% – 110% of full load for 60 minutes

110% – 125% of full load for 10 minutes

125% – 150% of full load for 60 seconds

>150% of full load for a minimum of 200 milliseconds

ENVIRONMENTAL CONDITIONS 

The UPS shall be able to withstand the following environmental conditions without damage or degradation of
operating characteristics:

Q. Operating Ambient Temperature

• Liebert UPS: 0°C to 40°C

• Battery: 25°C ± 3°C

R. Storage/Transport Ambient Temperature

• Storage: -25°C ~ +55°C; transportation: -40°C ~ +70°C

S. Relative Humidity
• 0 to 95%, non-condensing

T. Altitude
• ≤ 1500m; derate power by 1% per 100m between 1500m and 3000m

U. Audible Noise Level
• <62 dBA measured 1m from the surface of the unit

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