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Power Measurement
AD-LU 35 GT


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  Description

The digital power measuring converter AD-LU 35 GT measures all magnitudes of the three-phase network (current, voltage, energy, effective power, reactive power and apparent power..) and makes this data available via a RS485 bus. The unit is therefore optimally suitable for integration in energy management systems. 3- or 4-conductor networks can be measured. 4-wire networks can be loaded balanced or unbalanced, whereby 3-wire networks can only be measured balanced. The AD-LU 35 GT supplies itself via its measuring voltage L1. The current measurement takes place via additional external Split-Core-Transformer. The device is therefore ideal for retrofitting if no space is available. For measuring high voltages or currents, external converters can be fitted in series at any time. A Modbus-RTU protocol is run via the RS485 bus interface, whereby the AD-LU 35 GT represents a Modbus slave. The bus address is set via the rotary coding switch mounted at the front, this way several of these measuring units can be switched at one bus and can be interrogated from one central point. The AD-LU 35 GT can also be read and parameterized via the available AD-Studio. Two LEDs at the front signal the operating condition and the RS485 data traffic. The compact type of construction and the high performance ability, with simultaneous low energy consumption, allows usage in almost any application.

  Application

A typical usage is in energy management systems for balancing and determining the energy distribution. Due to the measurement via an external current transformer, the unit can be retrofitted without problems in any system without interruption.

AD-lu35gt_datenblatt.jpg

  Specific characteristics

  • compact size
  • current measurement through external split current transformer
  • power supply by measuring voltages
  • address setting via rotary coding switch
  • recording of all sizes of the three-phase system
  • parameter setting via AD-Studio
  •   Business data

    Order number
    AD-LU 35 GT digital power meter
    Accessory
    50A-Split-Core-Transformer 50 A AC primary / 33,3 mA AC secundary
    100A-Split-Core-Transformer 100 A AC primary / 33,3 mA AC secundary
    200A-Split-Core-Transformer 200 A AC primary / 33,3 mA AC secundary
    400A-Split-Core-Transformer 400 A AC primary / 33,3 mA AC secundary
    600A-Split-Core-Transformer 600 A AC primary / 33,3 mA AC secundary
    VarioPass RS485 to USB converter
    AD-NetGw 100 GT RS485 to Ethernet converter (Modbus-TCP)

      Download

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      Technical specifications

    Current-inputs (I1...I3)
    measuring ranges 0 ... 33,3 mA AC (over split-core-transformer)
    Input resistance ca. 10 Ohm
    Voltage-inputs (L1...L3)
    Measuring range 80 ... 253 V AC
    Input resistance ca. 500 kOhm
    RS485-Bus
    Software protocol Modbus-RTU
    Data format 19200, e, 8, 1
    Max. bus users 99
    Bus termination 120 ohms both sides at the end
    Max. length of bus 500 m (no stubs)
    Cable twisted and shielded
    Supply
    Voltage range AC 80 ... 253 V AC, 50/60 Hz (see voltage-inputs)
    Nominal voltage AC 230 V AC
    Power consumption max. 3 VA
    Transfer behavior - in reference to the current value
    Basic accuracy < 0,5 % (class 0.5)
    Temperature influence 80 ppm/K
    Response time < 2 s
    Housing
    Dimensions (WxHxD) 71x90x70 mm
    Type of protection IP 20
    Connection method screw clamp
    Terminals, wire cross section 2,5 mm² flex wire / 4 mm² one wire
    Bolting torque terminals 0,6 Nm
    Skinning length 6 mm
    Weight ~ 170 g
    Manner of fastening 35 mm DIN rail 35mm
    Environmental conditions
    Ambient temperature 0 ... 50 °C
    Storage and transport -10 ... 70 °C (no bedewing)
    EMC
    Product family standard EN 61326 1)
    Emitted interference EN 55011, CISPR11 Cl. B
    Electrical safety requirements
    Product family standard EN 61010-1
    Overvoltage category II
    Pollution degree 2
    Safety measurement EN 61010-2-030
    Measurement category CAT III
    Galvanic isolation, test voltages
    Grid side to RS485-Bus 4 kV, 50 Hz (1 min.)
    Grid side to control elements 4 kV, 50 Hz (1 min.)
    Protection circuits
    Input electrical surge protection
    RS485-Bus electrical surge protection
    Power supply protection against over-temperature, over-voltage and over-current
    1) During checking, slight signal deviations are possible.

      Block and wiring diagram

    AD-lu35gt_blockbild_en.svg

      Dimensions

    AD-lu35gt_masszeichnung_en.svg

      Modbus Communication

    The AD-LU 30 GT has a RS485 bus interface on which the Modbus RTU protocol is used. About this bus interface all measured data of the unit can be read out.
    The default standard data format is 19200,e,8,1. Adaptation to a different data format is always possible.

    data rate: 19200 baud (bits/s) parity: even data bit: 8 stop bit: 1

    The bus address is set at the front mounted rotary switches. The address 0 is prohibited for bus. However, on this zero position the device always using the standard data format (19200, e, 8,1). The position 0 therefore represents a service position, can be used for example at incorrect parameterization.

    The AD-LU 30 GT supports two Modbus functions. These are the functions "Read Holding Registers" (0x03) and "Write Multiple Registers" (0x10) . The function "Read Holding Registers" data can be read from the device and data is written with "Write Multiple Registers". The individual register width is 16 bits.
    Please refer to the Modbus specification for a detailed description of the Modbus communication. This is freely available online, but can also be obtained from the Adamczewski homepage.

    The following Modbus data are accessible via the RS485 bus:

    start address no. of registers name unit data type read write

    measurement reading:
    40801 2 active power L1 kW 7 1 0
    40803 2 active power L2 kW 7 1 0
    40805 2 active power L3 kW 7 1 0
    40807 2 reactive power L1 kVar 7 1 0
    40809 2 reactive power L2 kVar 7 1 0
    40811 2 reactive power L3 kVar 7 1 0
    40813 2 apparent power L1 kVA 7 1 0
    40815 2 apparent power L2 kVA 7 1 0
    40817 2 apparent power L3 kVA 7 1 0
    40819 2 current L1 A 7 1 0
    40821 2 current L2 A 7 1 0
    40823 2 current L3 A 7 1 0
    40825 2 voltage L1 V 7 1 0
    40827 2 voltage L2 V 7 1 0
    40829 2 voltage L3 V 7 1 0
    40831 2 frequency Hz 7 1 0
    40833 2 total active power kW 7 1 0
    40835 2 total reactive power kVar 7 1 0
    40837 2 total apparent power kVA 7 1 0
    40839 2 power factor L1 7 1 0
    40841 2 power factor L2 7 1 0
    40843 2 power factor L3 7 1 0
    40845 2 total power factor 7 1 0
    List-parameters:
    42001 1 BAUDRATE baud 3 1 1
    42002 1 STOPBIT 3 1 1
    42003 1 PARITY 3 1 1
    42004 1 LOAD TYPE 3 1 1
    Data-parameters:
    43001 2 FILTER s 7 1 1
    43003 2 PRIM_current A 7 1 1
    43005 2 SEC_current A 7 1 1
    43007 2 PRIM_voltage V 7 1 1
    43009 2 SEC_voltage V 7 1 1
    Counters:
    43505 2 total energy KWH EXTRAKT kWh 5 1 1
    43507 2 total energy KWH INFEED kWh 5 1 1
    43509 2 total energy KVARH INDUCTIVE kVarh 5 1 1
    43511 2 total energy KVARH CAPACITIVE kVarh 5 1 1
    43513 2 total energy KVAH kVAh 5 1 1
    44001 2 counter operation hours h 5 1 1


    Legend of the data types:
    U08: 1 S08: 2 U16: 3 S16: 4 U32: 5 S32: 6 float: 7


    Coding of the list-parameter (list index:value):
    Baudrate 0:2400 1:4800 2:9600 3:14k4 4:19k2 5:28k8 6:38k4 7:57k6 8:76k8 9:115k2
    Stopbit 0:1 1:2
    Parität 0:even 1:odd 2:none
    load type 0:unbal. 1:bal.