ENA520 is a device primarily designed to monitor the DC / AC inverters in photovoltaic power plants. Another use is to measure the AC / DC converters, which are part of the drives in paper, rolling or rubber mills. Basic measurements include RMS voltage and current, power, on AC side also THD, power factor and harmonics. On the AC side are evaluated in addition THD, PF, cos and harmonic voltage, current and power up to 9 kHz, DIN EN 61000-4-7. The unit provides for connection of electrical signals on AC and DC side where it is possible to connect signals to 3 voltage inputs with a range of 600 Vrms (respectively 1000 V DC) and 3 current inputs with a range up to 3000 A with external current sensors in the form of current clamps or Rogowski coils, which are available as accessories. For measurements on photovoltaic power plants are provided additional inputs for external sensors of temperature, RH and global sun radiation, which can be also supplied as accessories.

Key Features:

  • 3 galvanic isolated voltage inputs with antialiasing filters
  • 3 galvanic isolated direct current inputs with antialiasing filters
  • No rotating parts for high reliability
  • External sensors of temperature, RH and global sun radiation


Technical Specification:

Operating temperature -20 to +50 °C
Size 145 x 370 x 310 mm (h x w x d)
Weight 4 kg
Protection IP54
Voltage inputs
Number of inputs 3AC + 3DC
Input ranges AC: 400 V
DC: 1000 V
Isolation AC: 4,2 kV RMS, 5 s
DC: 4 kV DC, 5 s
Current inputs
Number of inputs 3AC + 3DC
Input ranges AC: according to clamps
DC: direct, according to module
Isolation According to clamps
Safety EN 61010-1:2004
EMC IEC 61000-6-2, IEC 61000-4-2 to 6
Analysis procedure EN 50160, EN 61000-4-7, EN 61000-4-15, EN 61000-4-30
Processor PowerPC 400 MHz
Storage 1 GB CF
Operating system VxWorks
Interface Ethernet
Display Touch screen
A/D converter 16 bits
Sampling frequency 25000 S/s
Power supply 180 to 265 V AC, 47-63 Hz
Power consumption Max 20 VA