UMG 512
(Class A Power Quality Analyser)

Class A Power Quality Analyser

The Janitza UMG 512 is particularly well suited to the monitoring of power quality in accordance with current standards, e.g. EN 50160, IEEE519 or EN 61000-2-4.

Class A
Measuring devices in class A are certified to the IEC 61000-4-30 standard. It provides detailed specifications that a mains analyser must meet so that the results can also be consulted in case of disputes. The standard defines the necessary parameters, suitable measurement methods, accuracy and bandwidths. This makes it possible to easily reproduce and compare results.
Power Quality
Reliable operation of modern plants and systems always demands a high degree of supply reliability and good power quality. UMG measuring devices reliably record, analyse and document all interferences such as harmonics, unbalance, transients, voltage dips, voltage swells, flickers, phase shifts and reactive power.
Powerful RCM residual current monitoring already detects leakage currents in their initial stages before they cause system failures or even fires. It is already integrated in certain UMG measuring devices. The measuring current transformer that is required can be installed manually at a later date if required. Continuous RCM monitoring increases the system safety and availability significantly. In specific applications such as the data centre, residual current monitoring is essential due to the high availability requirements.
Measuring devices homepage
The web server for the measuring device provides a wide range of data in a user-friendly format. The user does not have to install any software on their PC; a conventional web browser is all that is required. The user enters the measuring device IP address in the browser's URL bar and the measuring devices homepage is displayed on the screen. In addition to the modern homepage, APPs are available for an extended range of functions.
Ethernet Modbus Gateway
The Ethernet Modbus gateway can be used to easily include the Modbus RTU devices that are connected to the master device as slaves in an Ethernet architecture. This is also possible via a Modbus RTU interface for devices with identical file formats and matching function codes.
BACnet BACnet is one of the most important communication standards for building technology, mainly due to its compatibility with the most diverse hardware and its uniform communication with devices from various manufacturers. As soon as a UMG measuring device has received its BACnet ID and is integrated into the network, the system recognises it and displays it in the browser. This makes configuration very easy.

  • Profibus (DP/V0)
  • Modbus (RTU, TCP, Gateway)
  • TCP/IP
  • BACnet (optional)
  • HTTP
  • FTP (File transfer)
  • TFTP
  • NTP (time synchronisation)
  • SMTP (email function)
  • DHCP
  • SNMP

  • Ethernet
  • Profibus (DSUB-9)
  • RS485 Modbus (terminal strip)

Power Quality
  • Harmonics up to the 63rd harmonic, odd / even
  • Flicker measurement
  • Short term interruptions (from 10 ms)
  • Transient recorder (> 39 μs)
  • Start-up currents (> 10 ms)
  • Imbalance
  • Half wave RMS recordings (up to 11 min.)
  • Events can be displayed as waveforms

Accuracy of Measurement
  • Energy: Class 0.2S (... / 5 A)
  • Current: 0.2 %
  • Voltage: 0.1 %

Programming language
  • Graphical programming
  • Jasic®
  • PLC functionality

  • IT-, TN-, TT-networks
  • 3- and 4-phase networks

Network Visualisation Software
  • GridVis®-Basic (in the scope of supply)

Measured data memory
  • 256 MByte Flash

RCM – Residual Current Monitoring
  • 2 residual current inputs

2 digital inputs
  • Pulse input
  • Logic input
  • State monitoring
  • HT / LT switching

Thermistor inputs
  • PT100, PT1000, KTY83, KTY84

2 digital outputs
  • Pulse output kWh / kvarh
  • Switch output
  • Threshold value output
  • Logic output
(expandable via external I/O modules

Areas of Application
  • Continuous monitoring of the power quality
  • Harmonics analysis with power quality problems
  • Checking the internal supply network according to EN 61000-4-7, EN 6100-4-15, EN 61000-4-30
  • Fault analysis in case of problems with the energy supply
  • Documentation of the power quality for customers and regulatory authorities
  • Ethernet Gateway for subordinate measurement points
  • Report generator for power quality standards: EN 50160, IEE519, EN61000-2-4, ITIC
  • Report generator for energy consumptions
  • Energy Dashboard
  • Remote monitoring of critical processes


The Janitza UMG 512 is particularly well suited to the monitoring of power quality in accordance with current standards, e.g. EN 50160, IEEE519 or EN 61000-2-4.

Power quality
  • Harmonics analysis up to the 63rd harmonic, odd / even (U, I, P, Q)
  • Interharmonics (U, I)
  • Distortion factorTHD-U / THD-I / TDD
  • Measurement of positive, negative and zero sequence component
  • Imbalance
  • Direction of rotation field
  • Voltage crest factor
  • Flicker measurement in accordance per DIN EN 61000-4-15
  • Logging and storage of transients (> 39 μs)
  • Short term interruptions (from 10 ms), illustration with effective values and waveforms
  • he half wave effective values of voltage, current, power, reactive power and frequency for star and delta are available simultaneously
High Quality Measurement
  • Constant true RMS
  • Measurement process in accordance with IEC 61000-4-30
  • Certified accuracy of measurement per class A
  • Continuous sampling of the voltage and current measurement inputs at 25,600 Hz
  • 512 measurement points per period
  • Recording of over 2,000 measured values per measurement cycle
  • Accuracy of measurement of the active energy: Class 0.2
  • Ultrasonic measurement even enables the logging of rapid transients from 39 μs
  • Logging of currents and voltages (15 – 440 Hz)
Janitza-UMG512-Transienten Fig-Illustration-of-the-historic-data-via-the-home-page
GridVis® – network visualisation software

With GridVis®, Janitza offers powerful, user-friendly software for the development of energy and power quality monitoring systems. The basic version GridVis®-Basic, which is part of the scope of delivery of the measurement devices, serves both for the programing and configuration of the UMG 512 and also for the reading out, saving, display, processing and analysis of the measurement data. GridVis® is a comprehensive and scalable software solution for energy suppliers, industrial applications, facility management, building market and infrastructure projects. GridVis® provides technicians and managers with the required data to identify potential energy savings, reduce energy costs, avoid production shut- downs and optimise the utilisation of production resources.

Power Quality
  • Intuitive operation
  • Configuration of the measurement system and the UMG measurement devices
  • Certified ISO 50001 EnMS software
  • Automatic or manual readout of measurement data
  • Graphical illustration of online and historical measurement data
  • Comprehensive alarm management
  • User management
  • Generic Modbus devices, virtual meters
  • Graphic user interface (topological view) for visualising real-time data and messages
  • Display of minimum, average and maximum values in a graph
  • Statistical evaluation of the measured data
  • Comprehensive export functions (e.g. Excel)
  • Reports for energy usage and power quality (EN 50160, IEEE 519, EN 61000-2-4) manual or time-controlled with individual schedule
  • Saving of data in a central database incl. database management (e.g. MySQL / MS SQL / Derby / Janitza DB)
  • Open system architecture and scalability
  • Diverse attributes are dependent on the version

The power quality in the real grid nowadays is far removed from a pure sinusoidal waveform in most cases. Various different "grid feedback effects" in the form of voltage interruptions, transients, harmonics, flicker or start-up currents change the sinusoidal character of the currents and thus also the voltage.The GridVis® software offers all tools necessary for the PQ analysis and likewise for the energy management systems.The heart of the network analysis and the energy management is the reporting system of the GridVis® software. This shows at a glance the confirmation of whether the power quality is adequate or not in the time period in question. Reports can compile different information, depending on the requirements and the settings.Thus one can have energy and power related cost centre reports, for example. In doing so the display of arbitrary media (gas, water, etc.) is possible. Load profile analyses provide a quick overview of the peak consumption.

Power Quality
  • Pre-defined PQ reports provide immediate statements about the power quality and compliance with the applicable standards: EN 50160, EN 61000-2-4, NeQual, IEEE 519, ITIC (CBEMA) (only manual)
  • Reports can be generated, time-driven
  • Freely configurable time plans
  • Reports’ outputs as paper or digital (HTML, XML, Excel, Word or PDF)
  • Convenient, time-driven, automatic Excel export for further processing of the data or incorporation into other systems
Energy Management
  • Integrated report generator enables the evaluation of the delivered energy usage data
  • Presentation of the electrical energy values from measurement devices as well as evaluation of other media (e.g. gas, water, etc.) possible
  • Load profile analyses provide an overview of peak consumption throughout a stipulated period of time
EN 50160 power quality, annual report

Energy suppliers have the challenge of numerous measurement points over a 52 week period. In practice one cannot look through this large number of individual reports.The GridVis® software provides reports for energy supply companies, distribution network operators and regulatory authorities.This annual overview is based on the standard EN 50160 and ensures a quick overview of the supply areas in which EN 50160 was not complied with for defined periods of the year.

Dimension Diagrams(in mm)
Typical Connections