Weidmüller EM122-RTU-2P Manual de usuario
EM122-RTU-2P
Manual
Revision History
Version
Date
Change
0
2021.3.9
First edition
Contents
General................................................................................................................................................................................................... 5
Copyright..................................................................................................................................................................................... 5
Trademarks.................................................................................................................................................................................. 5
Disclaimer .................................................................................................................................................................................... 5
Meaning of the symbols......................................................................................................................................................... 5
Application notes ...................................................................................................................................................................... 6
About these operating instructions .................................................................................................................................... 7
Incoming goods inspection ............................................................................................................................................................ 8
Scope of delivery....................................................................................................................................................................... 8
Product description ........................................................................................................................................................................... 9
Intended use............................................................................................................................................................................... 9
Specifications............................................................................................................................................................................10
Operating concept..................................................................................................................................................................12
EM configuration tools..........................................................................................................................................................13
Connection options................................................................................................................................................................13
Assembly.............................................................................................................................................................................................14
Installation location ................................................................................................................................................................14
Power supply ............................................................................................................................................................................14
Voltage and current measurement inputs .....................................................................................................................15
Direction of the current.........................................................................................................................................................16
RS485 interface........................................................................................................................................................................16
Terminating resistors ....................................................................................................................................................17
Shielding ...........................................................................................................................................................................17
Cable type ........................................................................................................................................................................18
Maximum cable length ................................................................................................................................................18
Bus structure....................................................................................................................................................................18
Pulse Output.............................................................................................................................................................................20
Examples of electrical connections ...................................................................................................................................21
Configuration and display.............................................................................................................................................................22
Self-check after power on....................................................................................................................................................22
Button functions......................................................................................................................................................................23
Overview of measured value displays..............................................................................................................................24
Voltage and Current .....................................................................................................................................................24
Frequency and Power Factor and Demand ..........................................................................................................25
Power.................................................................................................................................................................................26
Energy Measurement ...................................................................................................................................................27
Configuration menu...............................................................................................................................................................28
Set-up Mode............................................................................................................................................................................28
Set-up Entry Methods...........................................................................................................................................................29
Menu Option Selection................................................................................................................................................29
Number Entry Procedure ............................................................................................................................................29
Change Password ..........................................................................................................................................................30
DIT Demand Integration Time............................................................................................................................................31
Backlit Set-up...........................................................................................................................................................................32
Supply System..........................................................................................................................................................................33
Pulse Output.............................................................................................................................................................................34
Pulse Rate ..................................................................................................................................................................................35
Pulse Duration..........................................................................................................................................................................36
Communication .......................................................................................................................................................................37
RS485 Address................................................................................................................................................................37
Baud Rate .........................................................................................................................................................................38
Parity ..................................................................................................................................................................................39
Stop Bits............................................................................................................................................................................40
CLR......................................................................................................................................................................................41
Modbus Communication Protocol.............................................................................................................................................42
Input Registers, Function code 04.....................................................................................................................................42
Holding Register, Function code 03/10...........................................................................................................................45
Dimensional drawings ....................................................................................................................................................................48
Connecting example .......................................................................................................................................................................48
- 5
General
This manual applies to the products:
7760051003 Energy Meter EM122-RTU-2P
Copyright
This manual is subject to the laws of copyright protection and may not be mechanically or electronically
photocopied, reprinted, reproduced or otherwise reproduced or published in part or as a whole, without the
legally binding, written consent of
Weidmüller Interface GmbH & Co. KG
Klingenbergstraße 26
32758 Detmold Germany
Trademarks
All trademarks and the rights resulting from them remain the property of the trademark holder of these
rights.
Disclaimer
Weidmüller assumes no responsibility for errors or omissions in this manual and assumes no obligation to
keep the contents of this manual up to date.
Meaning of the symbols
The following pictograms are used in this manual:
Dangerous voltage!
Risk of death or serious injury. Disconnect the power before working on the system
and device.
Attention!
Please refer to the documentation. This symbol will warn you of possible dangers that
could occur during assembly, commissioning and operation.
Note!
- 6
Application notes
Please read these operating instructions and all other publications that must be consulted in order to work
with this product (particularly for installation, operation or maintenance).
Please observe all safety regulations and warnings. Non-compliance with the instructions can lead to
personal injury and/or damage to the product.
Any unauthorized alteration or use of this device which exceeds the specified mechanical, electrical or other
operational limits can cause personal injury and/or damage to the product.
Any such unauthorized alterations are grounds for “abuse” and/ or “negligence” in terms of the product‘s
guarantee and thus excludes the warranty for covering any possible resulting damages.
This device must only be operated and maintained by qualified personnel.
Qualified personnel are persons who, due to their respective training and experience, are able to recognize
risks and avoid potential hazards that can be caused by operation or maintenance of the device.
When using the device, the legal and safety regulations required for the respective application must also
be observed.
- 7
Safety is no longer guaranteed and the
device may be dangerous if the device
is not operated according to the
operating instructions.
Only screw terminals with the same
number of poles and the same type may
be plugged together.
All signals connected with the
device’s SELV circuit must also
conform with the SELV provisions.
Conductors consisting of single wires
must be provided with ferrules.
About these operating instructions
These operating instructions are part of the product.
•Read the operating instructions prior to using the device.
•Keep the operating instructions at hand throughout the entire service life of the product and keep ready
for referencing.
•Hand over the operating instructions to each subsequent owner or user of the product.
- 8
Incoming goods inspection
The proper and safe operation of this device requires appropriate transport, proper storage, installation
and assembly as well as careful operation and maintenance. When it is assumed that safe operation is no
longer possible, the device must immediately be taken out of operation and secured against accidental
start-up. Unpacking and packing must be carried out with the usual care, without the use of force and only
with the use of suitable tools. The devices must be visually inspected for proper mechanical condition. It
can be assumed that safe operation is no longer possible if the device, e.g.
•shows visible damage;
•does not work despite intact power supply;
•and was exposed to unfavorable conditions (e.g. storage out- side of the permissible climatic limits
without adaptation to the ambient climate, condensation, etc.) or transport stresses (e.g. falling from a
great height even without exterior visible damage, etc.) for prolonged periods;
•Please check that the is complete before you begin with installation of the device.
Scope of delivery
Quantity
Designation
1
Energy Meter 122
1
Quick guide
- 9
Product description
Intended use
The Energy Meter 122 measures and displays the characteristics of 1P2W, 3P3W, 3P4W’s applications. The
unit provides voltage, current, power, frequency, power-factor, and energy etc.
The Energy Meter 122 is permanently installed in control cabinets or small distribution boards. It can be
installed in any position.
Measurement voltages and measurement currents must originate from the same grid.
Energy Meter EM122-RTU-2P supports max. 100A direct connection, saves the cost and avoid the trouble to
connect external CTs, giving the unit a cost-effective and easy operation.
The measurement results can be displayed and can be read and processed over the RS485 interface.
The Energy Meter 122 designed for mounting in low voltage distributions, containing overvoltage in
measurement category III.
EM122 series have one RS485 remote communication port.
- 10
Specifications
Electrical characteristics
Type of measurement
RMS including harmonics on three phase AC
system (3P, 3P+N)
Measurement
accuracy
Voltage
0.5%
Current
0.5%
Frequency
0.2%
Power Factor
±0.01
Active Power
1%
Reactive Power
2%
Apparent Power
2%
Active Energy
IEC62053-21 Class 1
Reactive Energy
2%
Input-Voltage
Un
230 V L-N
Measured Voltage with
Over-range and Crest
Factor
80%-120% of Un
Frequency Range
45~65Hz
Input- Current
Base Current
10A
Max. Current
100A
Min. Current
0.5A
Over current withstand
30 x Imax 0.01s
Auxiliary Power
Supply
Operating Range
Self powered
Power Consumption
<2W/10VA
Frequency
50/60 Hz
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