AD-LU 35 GT

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.

AD-LU 35 GT

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.

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
AD-MM 400 TFT-Display
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
Order number
AD-LU 35 GT
Accessory
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)
Identifiers
EClass 27210124
Customs tariff number / country of origin 8543 70 90 / Deutschland

Information

Downloads
Data sheet pdf en-lu35gt.pdf (332 kB)
Tender text zip lu35gt.zip (15 kB)
Safety instructions pdf ad-safety-instructions.pdf (43 kB)

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 -10 ... 50 °C
Storage and transport -10 ... 70 °C (no condensation)
EMC
Product family standard EN 61326-1 1)
Emitted interference EN 55011, CISPR11 Cl. B, Gr. 1
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-LU 35 GT

Dimensions

AD-LU 35 GT

CAD / CAE Daten

CAD model is not yet available for this product.

The CAD product overview can be found at: adamczewski.partcommunity.com

Modbus Communication

The AD-LU 35 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 35 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:
start address no. of registers name unit data type read write
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:
start address no. of registers name unit data type read write
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:
start address no. of registers name unit data type read write
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
43011 2 MIN_load % 7 1 1
Counters:
start address no. of registers name unit data type read write
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
44013 2 counter load 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.

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