|
An Inverter turns DC mains into AC one, at a constant output frequency.
Direct Current input
Input voltage may come from different sources, i.e. solar panels, batteries, rectifiers, busbars, etc. Usually this voltage is variable, because these power sources works in very variable conditions. So JEMA’s inverter is design to admit an input voltage wide variation, while keeping the requested output parameters levels.
Transference by-pass
Ondulators works on-line and they are usually equipped with a static by-pass to be able, in an emergency case, to transfer to an auxiliary mains. Also they have a manual one for maintenance.
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. It also carries out the synchronisation with the auxiliary main, in units that add a by-pass. 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, 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
• 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
• parallel operation with other units, as an option
SPECIFICATIONS (generic, to detail for each case)
Input 24 / 48 / 110 / 125 / 220 VDC
Voltage margin according to design
Output From 1 to 1300 kVA
Single-phase 220 VAC, ± 1 %
Three-phase 220 / 380 / 400 VAC, ± 1 %
Voltage adjustment ± 5% Vn
Frequency 50 / 60 / 400 Hz, ± 0,1 %
Admissible cos φ 0.6 capacitive / 0.4 inductive
First harmonic 3%
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 Transference by-pass, without failure
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 |
|
|
