(20 Channel branch circuit monitoring device with RCM)

20 Channel Branch Circuit Monitoring Device with RCM
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.
Harmonics occur due to operating equipment with a non-linear characteristic, e.g. transformers used in saturation, energy saving bulbs, frequency converters and power electronics. They cause a load on the mains due to additional currents and can affect or even destroy operating equipment. This mains feedback can be detected and documented using power quality analysers.
Modbus Interface
Many UMG measuring devices have an RS485 interface with a Modbus RTU protocol, which enables extremely cost-efficient networking. It features simple topology configuration and a lack of sensitivity to EMC interference. Communication between the sender and the recipient takes place on a wired basis via a sheathed, twisted pair cable.
Alarm management
The alarm management feature in GridVis® monitors all measurement parameters captured by the UMG measuring devices. It comprises escalation management, a logbook function and user management for individual notifications by e-mail, dialogue box on the monitor, etc.In addition to monitoring effective values, short term interruptions and transients, as well as communication with the measuring devices can also be monitored.
GridVis® is a comprehensive and scalable piece of software for setting up an energy monitoring system and monitoring the power quality. It is used to both program and configure many UMG measuring devices, as well as to read, process and analyse the measured data. Typical applications are energy supply, industrial systems, facility management, etc.
Current channels (UMG 20CM)
While power quality analyses and energy management play a central role on the main feed-in, individual currents are recorded in sub-distribution.The UMG 20CM energy and residual current measuring device has more than 20 current channels for this, i.e. connections for current measurement transformers. Therefore, operating currents of up to 600 A and residual currents from 10 mA to 1000 mA can be recorded.

Interfaces / Communication
  • RS485
  • Modbus RTU

Power Quality
  • Harmonics up to 63rd harmonic (analysis channel)
  • Crest factor / total harmonic distortion
  • Minimum and maximum values for currents with time stamp
  • Threshold value for each current channel / limit value bit

Accuracy of Measurement
  • Active energy Class 1
  • Current: 0.5 %
  • Voltage: 0.5 %

20 Current Measurement Channels
  • true RMS measurement
  • High sampling rate at 20 kHz
  • Operating current and residual current monitoring (RCM)

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

2 digital outputs (open collector)
  • Pulse output kWh / kvarh
  • Relay / PLC inputs

Areas of Application
  • Continuous acquisition of the operating currents
  • Permanent residual current monitoring
  • Messages in the event of the nominal current being exceeded
  • Energy acquisition for complete current distribution
  • Cost centre accounting
  • Transparency of energy costs
  • More effective use of IT infrastructure
  • PDUs in data centres
  • Increase of high availability power supply

Power Quality
  • Harmonics upto 63rd Harmonics
  • Crest factors/Total Harmonics Distortion
  • Maximum and minimum values for currents with time stamp
  • Thresold values for each current channel/limit value bit
UMG 20cm
RCM and energy measurement device in a single unit
  • 20 current measurement channels +/- 0.5 %
  • 4 voltage measurement channels +/- 0.5 %
  • Internal RS485 interface (Modbus as Slave)
  • 20 LEDs – One LED for each current channel (Green = o.k., Yellow = Warning; Red = Nominal current exceed)
  • Measurement range of operation current with burden up to 63 A with closed or split core current transformers (standard measured values: V, A, kW, kVA, kVar, kWh)
Fig Operating current and RCM fault current monitoring
The System For Smart People
  • Compact nature of the system
  • Can be retrofitted to existing systems
  • Modbus RTU directly on board
  • "State indication per channel (LEDs)"
  • Name stored per channel in the measurement device
  • "Wide range power adapter (90 – 276 V ... AC / DC)"
  • Integration in the GridVis® software
  • Diverse current transformer variants for the individual application
  • Measurement Variants:
    A-Three-phase and single-phase energy measurement
    B-RCM measurement three-phase and single-phase
  • "High sampling rate 20,000 Hz"
  • "Current transformer connection monitoring (i.e. wire break will be detected)"
  • Harmonics analysis up to 63rd harmonic via analysis channel
  • Saving of minimum and maximum values with time stamp
  • "Standard measured values: V, A, kW, kVA, kVar, kWh (variable list)"
  • Scalability of the system
Power supply without drop-outs
  • Permanent monitoring and logging of processes in TN-S or TN-C-S systems
  • Simple parameterisation and operation of the RCM measurement
  • Automatic reporting in the event of problems enables a rapid initiation of countermeasures
  • Comprehensive diagnostics increase safety and efficiency of a company
Alarms before failures (preventative residual current analysis)
  • Faults arising will be detected in good time
  • Monitoring, evaluation and reporting of creeping increases in residual currents (e.g. triggered by insulation faults and operating currents for system parts or loads being too high)
  • Reduction of downtimes
Sensors for energy management
  • Energy data of a large number of loads can be acquired and passed to a database with ease
  • Automatic reading out and saving of the measured values and data saved in the measurement devices as well as the exceedance of parameterised threshold values
  • Channel-specific measured values of the current monitoring devices can be displayed via the GridVis® software
      1) The progression of measured values is visualised graphically
      2) Display of warnings or fault messages possible, e.g. via the topology views
      3) Associated message texts can be freely configured for this
      4) Automatic sending of an email in the event of operational or fault messages
      5) Remote monitoring of the entire system is possible via internet
      6) Residual current and operational current monitoring devices can be parameterised via GridVis® (Modbus)
  • The evaluation and saving of data in central databases is implemented via the GridVis® software
  • The greater the scope of information, the more accurate the determination of savings potentials
  • Energy optimisation offers a higher, more economical savings potential (ISO 50001)
Your benefits
The intelligent system solution
  • Early warning with system failures
  • Avoidance of costly and hazardous system downtimes; the availability of systems is increased
  • Localisation of individual faulty feeders, reduced work when troubleshooting
  • Early detection of an overloading of the N conductor and critical residual currents, resulting in increased fire safety
  • Through parameterisation of the system in new condition and constant monitoring, all changes to the system state after the point of commissioning can be detected
  • Fulfilment of the safety criteria "RCM residual current monitoring" in data centres
  • Convenient monitoring and parameterisation solution with GridVis® software
  • Operating current acquisition of all relevant consumers as a basis for an energy management system (EnMS)
Dimension Diagrams(in mm)
Typical Connections