Power Measurement
AD-LU 680 GA

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The AD-LU 680 GA is a programmable transmitter for measuring all parameters such as power, voltage, current or frequency in the mains. The currents are registered via external clamp-on current transformer. Any measured quantity can be allocated to each analogue outlet. The measuring ranges can be configured in wide ranges. Filters, which can be individually parameterized, supplement the adaption possibilities of the measuring task. Each switching output can be assigned to a specific function. Possible functions include, for example, Limit or pulse output for energy metering.


Measurement and analog output of up to 4 signals in a three-phase mains. Easy recording of currents by external clamp-on current transformer CT. Limit indicators for monitoring of up to 2 signals in a three-phase mains. Analogue front-end for energy management systems. Registration of all relevant measuring quantities of the three-phase current network and supply of the measuring quantities via a modbus interface.


  Specific characteristics

  • Measuring quantities: effective power, reactive power, apparent power, currents and voltages, frequency, power factor, energy metering
  • The currents are registered via external clamp-on current transformer.
  • Four bipolar analogue outputs as current output or voltage output, configurable per software
  • Two switching outputs as relay or opto-coupler. Functions: limiting value, window, trend, S0, monitor
  • Meter for effective energy, reactive energy and apparent energy
  • Values for each phase and they can be polled as sum
  • Output of up to four measuring quantities of the three-phase current network such as effective power, current, voltage or frequency
  • Indication of the power fed back into the network is possible via analogue output and/or switching output
  • Connection configurations: single-phase, three-phase current with/without neutral conductor, equally/unequally loaded
  • All measuring quantities can be read out via modbus
  • All measuring ranges, output ranges and device functions can be configured per software with a PC programme.
  •   Business data

    Order number
    AD-LU 680 GA
    Preconfigured optional
    Optocoupler outputs optional
    Current transformers, not included
    KSW 50 50A / 33,3mA
    KSW 100 100A / 33,3mA
    KSW 200 200A / 33,3mA
    KSW 400 400A / 33,3mA
    KSW 600 600A / 33,3mA
    Please order the required CTs with the product.



      Technical specifications

    Voltage inputs
    U1N, U2N, U3N Nominal 230 V AC
    U1N, U2N, U3N Max 300 V AC
    Current consumption per phase 0,5 mA AC
    Peak load 600 V AC, 1s
    Current inputs
    Rated current I1, I2, I3 0 ... 33,3 mA AC
    Peak load 700 mA AC, 1s
    Continuous load 100 mA AC
    Input resistance per phase ~10 Ohm
    Analog outputs
    Number 4
    Current or voltage configurable
    Current outputs
    Max. residual ripple 40 ľAss
    Max. burden 400 Ohm
    Maximum output range -21 ... 21 mA
    Voltage outputs
    Max. residual ripple 20 mVss
    Min. burden 10 kOhm
    Maximum output range -10,5 ... 10,5 V
    Contact outputs
    Closer 2
    Switching capacity AC 250 V AC, 2A, 50Hz
    Switching capacity DC 50 V DC, 2A
    Optocoupler outputs
    Switching capacity DC 30 V DC, 50 mA DC
    Accuracy class 0,5%
    Temperature influence < 200 ppm/K
    Frequency influence ~0,2 %, 40 ... 60 Hz
    Influence of phase angle ~0,2 %, 40 ... 60 Hz
    Response time ~500 ms, 10 ... 90 %
    Communication interface
    Physical RS-485
    Parameter 19200, 8, 1 , even
    Protocol Modbus RTU
    DC 20 ... 253 V DC, 5 W
    AC 50 ... 253 V AC, 9 VA
    Type of protection IP 20
    Connection method screw clamp
    Cross section fine wire 2,5 mm2
    Cross section one wire 4 mm2
    Mounting DIN rail mounting
    Weight ~450 g
    Environmental conditions
    Operating temperature 0 ... 50 °C
    Storage, transport -25 ... 80 °C
    Electromagnetic compatibility
    Product family standard EN 61326
    Emission EN 55011, CISPR11 Cl. B
    During an interference effect slight signal deviations are possible.
    Electrical safety requirements
    Product family standard EN 60688
    Overvoltage category III
    Pollution degree 2
    Isolation-voltage 500 V AC
    Test voltage input/output 5 kV RMS, 1 Min.
    Test voltage output/supply 4 kV RMS, 1 Min.

      Block and wiring diagram




      Circuit examples