Device Description
What you will find in this section:
Device description
The EMpro energy measuring devices (EEM-MA77x types) are universally deployable, high-precision, network-compatible measuring devices with LC display, which can measure, evaluate and process voltages and currents in one, two and three-phase power supply systems. For voltage measurements, up to four inputs are available; for current measurements, up to three inputs are available. You can use EMpro energy measuring devices in TN and IT systems.
Typical installation locations of EMpro energy measuring devices are:
- Assemblies of switchgear and controlgear, assembly of switchgear and controlgear systems
- Control panels
- Control desks
To enable versatile use, EMpro energy measuring devices are available for the following installation methods:
- For front panel installation or with DIN rail adapter, with LC display, with control buttons
- For DIN rail installation, with LC display, with control buttons (included in the EMpro product family, but not described in this user manual)
- For DIN rail installation, without LC display, without control buttons (included in the EMpro product family, but not described in this user manual)
If you use a DIN rail adapter (EEM-MKT-DRA, Order Number 2902078), you can mount EMpro energy measuring devices for front panel installation on a 35 mm DIN rail.
Your advantages:
- Precise knowledge of load profiles allows load management, optimization of the electrical energy usage and optimization of energy consumption from the public supply network and own production (e.g., CHP, PV system).
- Meaningful load profiles are an important aid for planning system expansions and building new systems.
- Energy costs can be assigned to individual functional divisions or cost centers.
- A transparent overview of the energy flows increases the awareness of energy consumption, uncovers waste of energy and makes it possible to identify energy-intensive system components and equipment that harbors potential energy savings.
- Critical system states can be detected, reported and registered. Such critical system states can, e.g., be caused by overload, unbalanced load, undervoltage, voltage and current distortion by non-linear consumers, etc. Detection of critical system states makes it possible to quickly react to such states in order to prevent potential decreases in availability or energy supply failures. When critical system states are detected in time, measures can be taken to ensure permanent system availability.
- Seamless communication with control systems via Modbus/RTU, Modbus/TCP, PROFINET and EtherNet/IP™ and with higher-level energy management systems via standard TCP/IP networks (Ethernet, RJ45)
- Intuitive configuration and operation of EMpro energy measuring devices with four front buttons or integrated web server
Numerous parameters that are important for operating an electrical system are determined by means of the voltages and currents measured by the EMpro energy measuring devices. Apparent power, active power and reactive power are measured in all four quadrants (consumption, supply).
EMpro energy measuring devices have an integrated web server. It enables:
- Convenient configuration
- Data logging
- Mains quality evaluations
- Detailed recording of energy flows
A configurable digital input and a configurable digital output are also available. Communication interfaces to higher-level control systems are integrated in the device, depending on the type.
Currents can be measured with current transformers or Rogowski coils. If you use Rogowski coils, you do not need an external measuring transducer. EMpro energy measuring devices can be connected directly to Rogowski coils from any manufacturer. Different device types are deployed depending on whether current transformers or Rogowski coils are used. Voltages can be measured directly, or by means of voltage transducers.
Voltages and currents are measured using the principle of True RMS value measurement (TRMS) up to the 63rd harmonic, which enables detailed assessment of the mains quality.
When EMpro energy measuring devices with LC display are used, it is possible to locally display measurement values and perform configuration tasks locally by means of buttons. All EMpro energy measuring devices have a Modbus communication interface and an integrated web server. Other communication interfaces are available, depending on the type. Via the web server, all relevant measurement values and parameters can be displayed and the energy measuring devices can be configured. On the web interface, settings can be configured for the following, among others:
- Grid types
- Average values
- Four energy meters for apparent power, active power, reactive power, consumption/supply
- Energy tariff meter
- Logging
- Alarms and behavior in the event of alarms
- Network (TCP/IP)
- Interfaces with higher-level control systems
- Digital output (with logic functions)
- Digital input
- Impulse counter
- Date/time (realtime clock, SNTP compatible)
- Identifier (of metering point)
- Display
Other features of the EMpro energy measuring devices are:
- Firmware update function
- Password protection (local and web-based management (WBM))
- Deactivation of control buttons for configuration
- Sealable connection fields
- Export, import and direct transfer of configuration data
- Color changes on display (white, red) in the event of errors/events
The following measurement values/parameters are shown on the LC displays of EMpro energy measuring devices:
- Voltage U [V] (L-L, L-N)
- Current I [A]
- Frequency f [Hz]
- Active power P [W] (string, total)
- Reactive power Q [var] (string, total)
- Apparent power S [VA] (string, total)
- Power factor PF, λ
- Active power factor, active factor cos Φ
- Phase shift angle, phase angle Φ (U-U, U-I)
- Total harmonic distortion (ratio) of the voltage, THD U (L-L, L-N)
- Total harmonic distortion (ratio) of the current, THD I
- Energy E [Wh, varh, VAh] (consumption/supply)
- Energy tariff meter E [Wh, varh, VAh] (consumption, supply, meter 1-4)
For the measurement values/parameters voltage U (L-L), U (L-N), current I, frequency f, active power P, reactive power Q and apparent power S, it is possible to switch between:
- Instantaneous = Instantaneous value
- Min = Minimum value (can be reset)
- Max = Maximum value (can be reset)
- AVG = Current average value
- AVG Min = Minimum average value (can be reset)
- AVG Max = Maximum average value (can be reset)
All the measures described above are also available via the web server that has been integrated into the EMpro energy measuring device. In the web browser, the data cannot only be displayed numerically, but also in the form of a convenient analog display with trend charts.
A variety of hardware and software interfaces can be used to communicate with higher-level control systems. At the time this document is written, the following interfaces are available:
- Modbus/RTU (RS-485)
- Modbus/TCP (Ethernet)
- PROFINET (Ethernet, Dual Port)
- EtherNet/IP™ (Ethernet, Dual Port)
A variety of parameters from the EMpro energy measuring device can be read or configured in order to communicate with higher-level control systems. These parameters, the associated addresses, additional information and help texts are available on the web server. All information required for setting up communication with higher-level control systems is contained in a register table on the integrated web server. It is therefore usually not necessary to look up parameters in the paper copy of the documentation.
The register table contains:
- Device data
- Device information
- Device configuration (digital input/digital output)
- Network (TCP/IP)
- Interfaces for higher-level control systems (e.g., Modbus/RTU, Modus/TCP, PROFINET, EtherNet/IP™)
- Control and status registers
- Device control
- Device status
- Measuring system control
- Process data
- Measured values
- Counter values
- Impulse counter
- Statistics
- Total harmonic distortion THD
- Harmonics
- Voltage quality
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