Inverter / Ondulator

OPERATING PRINCIPLES, DESIGN AND GENERAL FEATURES OF THE DEVICE

An inverter transforms direct current (DC) into alternating current (AC), in this case, at a constant frequency.

Input source (DC)

The DC input can come from solar panels, rectifiers – chargers, batteries, DC bars, etc. The voltage is usually variable because the power sources operate in highly volatile situations. For that reason, the Jemainverter is designed to accept a wide margin of variation in input voltage while maintaining the desired output parameters.

Transfer by-pass

The inverters work on-line and usually include a static transfer by-pass to an auxiliary support grid for emergencies and a manual by-pass for maintenance work.

Device design

The device has excellent dynamic behaviour with IGBT transistors. It’s controlled by a microprocessor that governs the unit in response to different keywords and signals it receives and informs the user of its status. If it includes a by-pass, it synchronises with the auxiliary grid. Control functions:

  • History: last 250 alarms with time and date
  • Automatic control: programmable start up and shut down
  • Diagnostics: visualise and transmit the status of the device
  • Measurements:
  • Vef and Ief of all phases
    • Active, apparent and reactive power
    • Internal system temperatures
    • yield, power and frequency factor
    • Test: automatic, local/remote, periodic and programmable
    • Digital settings: parameters adjustable by keyboard
    • Configurable: basic system functions can be defined
    • Tips for using the keyboard

General features of the device 

  • Digitally synthesised perfect sine wave output
  • High frequency stability and output voltage
  • High performance, simplicity and reliability
  • Excellent behaviour with non-linear unbalanced loads
  • Multiprocessor digital control, PWM modulation
  • Interface using a display, keyboard, LEDs and serial communication
  • Built in galvanic isolation transformer
  • Can optionally operate in parallel with other units

Data Sheet

Features

  • Input: 24 / 48 / 110 / 125 / 220 Vdc – Voltage margin depending on 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% – allowable cos 0.6 capacitive / 0.4 inductive – Harmonic greater 3 % – Max. distor. THD global linear load < 3 % - non-linear load < 5 % - Dynamic response ± 5 % - Response time 30 ms - Crest factor 3 - Yield 80 - 93 %, depending on power
  • Options Transfer by-pass, without cut-off– LBP line stabiliser transformer – Redundant – Operation in parallel with other units –Anti-earthquake Class 1E – Output distribution board – Manoeuvre board – Adaptation to diverse regulations (MIL, UL …)
  • Design: Self-supporting metal cabinet – IP20 to IP54 Protection – Colour RAL 7032 (standard)

All the features above can be modified on demand.