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An UPS assures an AC supply to its loads, by means of batteries. It also filters grid disturbances, harmonics, over-voltages, etc. These features are requested by critical or vital loads that needs high quality and reliable power.
An UPS comprises 4 sub-systems:
- rectifier: turns AC input mains into DC
- batteries: stores the energy
- inverter: turns DC mains into the output AC one
- by-pass: constantly selects the best net (aux. or inverter)
UNIT DESIGN
Excellent dynamic behaviour unit, with IGBT transistors. One microprocessor control manages the system considering the received signals and orders, and informs the user about its status. Control functions:
- historic: 250 last alarms displayed, with date and time
- automatic control: programmable start-up and shut down
- diagnosis: unit status is displayed and transmitted
- measures: •Vef and Ief of all phases
•active, apparent and reactive powers
•internal temperatures
•efficiency
•input and output power factor and frequency
- test: automatic, local/remote, periodical and programmable
- digital adjust: adjustable parameters by keyboard
- configurable: adjustable system basic functions
- help: it provides help for the keyboard use
MAIN FEATURES
• high output power factor, ≥ 0,95
• perfect sine-wave output signal, digitally synthesised
• high frequency and output voltage stability
• high efficiency, simplicity and reliability
• excellent behaviour with non linear unbalanced loads
• digital multiprocessor control, PWM modulation
• display, keyboard, leds, and serial I/O channels interface
• galvanic insulation transformer incorporated
• optional parallel operation with other units
SPECIFICATIONS (generic, to detail for each case)
Input Three-phase 220 / 380 / 400 VAC, +15%, -10%
Frequency 50 / 60 Hz, ± 5%
Power factor ≥ 0.95
Output From 10 to 1300 kVA
Frequency 50 / 60 Hz, ± 0,1 %
Single-phase 220 VAC, ± 1 %
Three-phase 220 / 380 / 400 VAC, ± 1 %
Voltage adjustment ± 5% Vn
Admissible cos φ 0.6 capacitive / 0.4 inductive
Max. global THD dist. with linear load < 3 %
no linear load < 5 %
Dynamic response ± 5 %
Response time 30 ms
Crest factor 3
Efficiency 80 – 93 %, according to power
Options Pb or NiCd batteries
6 or 12 pulse
Anti-harmonics filter
BPL stabiliser transformer
Redundant
Parallel operation with other units
Antiseismic, Class 1E
Output distribution switchboards
Control cabinets
Adaptable to different standards (MIL, UL, ...)
Design Metallic self-stable cabinet
Protection grade IP20 to IP54
Colour RAL 7032 (typical)
All the above characteristics could be modified under demand |
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