Siemens SENTRON 7KT1681 User manual

Manual
Multimeter 7KT PAC1600
Measuring Devices
08/2018Edition
SENTRON
siemens.de/powermonitoring

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SENTRON
Measuring devices
7KT multimeter
Manual
08/2018
2514284149
-01
Introduction
1
Safety instructions
2
Description
3
Installation/removal
4
Connecting
5
Commissioning
6
Service and maintenance
7
Technical data
8
Dimensional drawings
9
ESD guidelines
A

Siemens AG
Division Energy Management
Postfach 32 20
91050 ERLANGEN
GERMANY
Document order number: 3ZW1012-0KT16-0AC1
Ⓟ
08/2018 Subject to change
Copyright © Siemens AG 2018.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.

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Manual, 08/2018, 2514284149-01 3
Table of contents
1 Introduction................................................................................................................................................ 5
1.1 Components of the product ......................................................................................................5
1.2 Latest information .....................................................................................................................5
1.3 Advanced training courses .......................................................................................................5
1.4 Open Source Software .............................................................................................................6
1.5 Qualified personnel...................................................................................................................7
2 Safety instructions ..................................................................................................................................... 9
2.1 Safety instructions.....................................................................................................................9
2.2 Security information ................................................................................................................11
3 Description............................................................................................................................................... 13
3.1 Performance features .............................................................................................................13
3.2 Measuring inputs.....................................................................................................................14
3.2.1 Current measurement.............................................................................................................14
3.2.2 Voltage measurement.............................................................................................................14
3.3 7KT PAC1600 multimeter .......................................................................................................15
3.3.1 Keypad functions ....................................................................................................................16
3.3.2 Selection of measured values.................................................................................................17
3.3.3 Display ....................................................................................................................................18
3.3.4 Harmonic displays...................................................................................................................22
3.4 Parameterization.....................................................................................................................23
3.4.1 Parameter setting (setup) from the front panel.......................................................................23
3.4.2 Energy measurements............................................................................................................25
3.4.3 Hour counter ...........................................................................................................................26
3.4.4 Limit threshold status display..................................................................................................27
3.4.5 Alarm display ..........................................................................................................................28
3.4.6 Parameter tables.....................................................................................................................28
3.4.7 Command menu .....................................................................................................................36
3.5 Wiring test ...............................................................................................................................37
3.6 Supporting software................................................................................................................37
3.6.1 powermanager ........................................................................................................................37
3.6.2 powerconfig.............................................................................................................................38
4 Installation/removal.................................................................................................................................. 39
4.1 Installation location .................................................................................................................39
4.2 Installation...............................................................................................................................39
4.3 Removal..................................................................................................................................40

Table of contents
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5 Connecting .............................................................................................................................................. 41
5.1 Connection examples ............................................................................................................ 42
5.2 Connecting the device ........................................................................................................... 47
6 Commissioning ........................................................................................................................................ 49
6.1 Overview ................................................................................................................................ 49
6.2 Applying the measuring voltage............................................................................................. 50
6.3 Parameterizing with powerconfig........................................................................................... 50
6.4 Modbus address register for devices with Modbus interface................................................. 52
6.4.1 Modbus measured variables with the function codes 03 and 04........................................... 52
6.4.2 Modbus command parameters .............................................................................................. 56
6.4.3 Setup parameters .................................................................................................................. 57
7 Service and maintenance ........................................................................................................................ 61
7.1 Firmware update .................................................................................................................... 61
7.2 Fault elimination measures .................................................................................................... 61
7.3 Warranty................................................................................................................................. 62
7.4 Disposal ................................................................................................................................. 62
8 Technical data ......................................................................................................................................... 63
8.1 Technical data........................................................................................................................ 63
8.2 Labels on the enclosure......................................................................................................... 66
9 Dimensional drawings.............................................................................................................................. 67
A ESD guidelines ........................................................................................................................................ 69
A.1 Electrostatic sensitive devices (ESD) .................................................................................... 69
Index........................................................................................................................................................ 71

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Introduction
1
1.1
Components of the product
The package includes:
●Operating instructions
●7KT PAC1600 multimeter
Available accessories
●Software powerconfig (https://support.industry.siemens.com/cs/ww/en/view/63452759)
●Software powermanager
(https://support.industry.siemens.com/cs/ww/en/view/109746290)
1.2
Latest information
Up-to-the-minute information
You can find further support on the Internet at:
(http://www.siemens.com/lowvoltage/technical-assistance)
1.3
Advanced training courses
Find out about training courses on offer on the following link.
Training for Industry (https://www.siemens.de/sitrain-lowvoltage)
This is where you can choose from
●Web-based training courses (online, informative, free)
●Classroom training courses (course attendance, comprehensive, subject to fee).
You also have the possibility of compiling your own training portfolio via
Learning paths
.

Introduction
1.4 Open Source Software
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6Manual, 08/2018, 2514284149-01
1.4
Open Source Software
This product, solution or service ("Product") contains third-party software components listed
in this document. These components are Open Source Software licensed under a license
approved by the Open Source Initiative (www.opensource.org (http://www.opensource.org))
or similar licenses as determined by SIEMENS ("OSS") and/or commercial or freeware
software components. With respect to the OSS components, the applicable OSS license
conditions prevail over any other terms and conditions covering the Product. The OSS
portions of this Product are provided royalty-free and can be used at no charge.
If SIEMENS has combined or linked certain components of the Product with/to OSS
components licensed under the GNU LGPL version 2 or later as per the definition of the
applicable license, and if use of the corresponding object file is not unrestricted ("LGPL
Licensed Module", whereas the LGPL Licensed Module and the components that the LGPL
Licensed Module is combined with or linked to is the "Combined Product"), the following
additional rights apply, if the relevant LGPL license criteria are met: (i) you are entitled to
modify the Combined Product for your own use, including but not limited to the right to
modify the Combined Product to relink modified versions of the LGPL Licensed Module, and
(ii) you may reverse-engineer the Combined Product, but only to debug your modifications.
The modification right does not include the right to distribute such modifications and you
shall maintain in confidence any information resulting from such reverse-engineering of a
Combined Product.
Certain OSS licenses require SIEMENS to make source code available, for example, the
GNU General Public License, the GNU Lesser General Public License and the Mozilla Public
License. If such licenses are applicable and this Product is not shipped with the required
source code, a copy of this source code can be obtained by anyone in receipt of this
information during the period required by the applicable OSS licenses by contacting the
following address:
Siemens AG
Energy Management
Low Voltage & Products
Technical Support
Postfach 10 09 53
93009 Regensburg
Germany
www.siemens.com/lowvoltage/support-request
(https://support.industry.siemens.com/cs/us/en/ps)
Keyword: Open Source Request (please specify Product name and version, if applicable)
SIEMENS may charge a handling fee to fulfil the request.
Warranty regarding further use of the Open Source Software
SIEMENS' warranty obligations are set forth in your agreement with SIEMENS. SIEMENS
does not provide any warranty or technical support for this Product or any OSS components
contained in it if they are modified or used in any manner not specified by SIEMENS. The
license conditions listed below may contain disclaimers that apply between you and the
respective licensor. For the avoidance of doubt, SIEMENS does not make any warranty
commitment on behalf of or binding upon any third-party licensor.

Introduction
1.5 Qualified personnel
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Manual, 08/2018, 2514284149-01 7
1.5
Qualified personnel
Some of the following tasks are carried out when hazardous voltage is present. For this
reason, they must only be carried out by qualified personnel who are familiar with the safety
regulations and precautions and who follow the safety regulations and precautions.
●Wear the prescribed protective clothing.
●Observe the general equipment regulations and safety regulations for working with high-
voltage installations (e.g. DIN VDE, NFPA 70E), as well as national or international
regulations.
●Ensure that the limits given in the technical data are not exceeded, not even during
commissioning or testing.
●Short circuit the secondary connections of intermediate current transformers at the
transformers before interrupting the current lines to the device.
●Test the polarity and the phase assignment of the instrument transformers.
●Before connecting the device, ensure that the system voltage matches the voltage
specified on the type plate.
●Before commissioning, ensure that all connections have been made correctly.
●Before power is applied to the device for the first time, you must place it in the operating
room for a period of at least two hours. This allows it to reach temperature balance and
avoids humidity and condensation.

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Manual, 08/2018, 2514284149-01 9
Safety instructions
2
2.1
Safety instructions
DANGER
Risk of death due to electric shock and arc flashover!
For the 5 A device, it is only possible to measure the current via external current
transformers. When using the current transformers, the circuit is not protected by a fuse.
•Switch off and lock out all power supplying this equipment before working on the device.
•Never open the secondary circuit of the current transformers under load.
•Short-circuit the secondary current terminals of the current transformer before removing
this device.
•Always follow the safety instructions for the current transformers used.
DANGER
Risk of death due to hazardous voltage!
Before starting work, disconnect the system and the device from the power supply.
WARNING
Possible risk of death due to damaged device!
Using devices when they are damaged may result in death, serious injury, or property
damage.
•Do not install damaged devices.
•Do not start up damaged devices.
NOTICE
Equipment damage due to lack of fusing
Non-fused voltage measuring inputs may lead to device and equipment damage.
Always protect the device with an IEC approved fuse or with an IEC approved miniature
circuit breaker.

Safety instructions
2.1 Safety instructions
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10 Manual, 08/2018, 2514284149-01
NOTICE
Device damage due to condensation
Humidity may cause condensation on the device if temperature balance has not been
reached. Condensation may damage the device when it is connected to the power supply.
Do not connect the device to the power supply until temperature balance has been
reached. To achieve temperature balance, place the device in the operating room for a
period of at least two hours.
Note
RS 485 termination recommended
In order to avoid reflection on the bus cable, we recommend fitting a 120
Ω terminating
resistor at the beginning and end of the bus cable.
To establish Modbus
RTU communication, the communication parameters must be known.
These include baud rate and forma
t. Furthermore, you must have entered the slave address
in the device.
Note
Risk of manipulation!
In order to reduce the risk of manipulation occurring on the device, it is recommended that
the protective mechanisms available in the device are
activated.
Default passwords for the protective mechanisms:
•
Use 1000 for user rights without write access.
•
Use 2000 for extended rights with write access.
Use a lead seal on the cover for security.
Safety-related symbols on the device
Symbol
Meaning
Risk of electric shock
Electrical installation demands technical competence

Safety instructions
2.2 Security information
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2.2
Security information
Siemens provides products and solutions with industrial security functions that support the
secure operation of plants, systems, machines and networks.
In order to protect plants, systems, machines and networks against cyber threats, it is
necessary to implement – and continuously maintain – a holistic, state-of-the-art industrial
security concept. Siemens’ products and solutions only form one element of such a concept.
Customers are responsible for preventing unauthorized access to their plants, systems,
machines and networks. Such systems, machines and components should only be
connected to an enterprise network or the Internet if and to the extent such a connection is
necessary and only when appropriate security measures (e.g. firewalls and/or network
segmentation) are in place.
For additional information on industrial security measures that may be implemented, please
visit internet (http://www.siemens.com/industrialsecurity)
Siemens’ products and solutions undergo continuous development to make them more
secure. Siemens strongly recommends that product updates are applied as soon as they are
available and that the latest product versions are used. Use of product versions that are no
longer supported, and failure to apply the latest updates may increase customer's exposure
to cyber threats.
To stay informed about product updates, subscribe to the Siemens Industrial Security RSS
Feed (http://www.siemens.com/industrialsecurity).

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Description
3
3.1
Performance features
The 7KT1681 and 7KT1682 multimeters are designed such that they combine maximum
operating comfort with a wide range of advanced functions, and this despite the extremely
restricted dimensions of the modular enclosure (only 4U).
The backlit LCD offers intuitive operation of the clearly laid out user interface.
The 7KT1682 additionally features an insulated RS 485 communications interface with
Modbus protocol support.
Multimeter
Description
7KT1681
Universal meter without S0
interface
7KT1682
Universal meter with Modbus
RTU
Measurement
The 7KT1681 and 7KT1682 multimeters measure all the relevant electrical variables in an
AC system.
Interfaces
Optional interfaces depending on device version:
●RS 485 interface
●Digital input
●Digital output
Memory
Adjusted device parameters are permanently stored in the device memory.

Description
3.2 Measuring inputs
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3.2
Measuring inputs
3.2.1
Current measurement
NOTICE
Device damage due to DC current
The device is not suitable for measuring DC current.
Only measure AC current with the device.
Design of the device
The devices are designed for a rated current of 1 A or 5 A for connecting standard current
transformers.
Ampacity of current measuring inputs
The current measuring inputs can be continuously loaded as follows:
●With 1.2 A at a rated current of 1 A
●With 6 A at a rated current of 5 A
3.2.2
Voltage measurement
NOTICE
Device damage due to DC current
The device is not suitable for measuring DC current.
Only measure AC current with the device.
Design of the device
The device is designed for:
●Direct measurement on the grid
●Nominal voltage 364 V/600 V

Description
3.3 7KT PAC1600 multimeter
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Measuring input voltages
The device is designed for the following measuring input voltages:
●For measuring input voltages up to 415 V phase-to-neutral
●For measuring input voltages up to 720 V phase-to-phase
3.3
7KT PAC1600 multimeter
①
Sealing cover
②
Display
③
Arrow key for scrolling, selecting
and changing
④
Arrow key for scrolling, selecting
and changing
You will find information on operation in chapter Keypad functions
(Page 16) ff.
⑤
Arrow key for scrolling, confirming
and switching over
⑥
Menu key
Basic properties
●Three-phase digital multimeter
●4U modular enclosure (72 mm) for DIN rail
●Backlit LCD
●2 versions:
–7KT1681: Standard version
–7KT1682: With built-in RS 485 interface
●4 navigation keys for functions and settings
●Extremely accurate measurement of demand (TRMS)
●Wide selection of available measurements, including voltage, current, THD and
harmonics analysis

Description
3.3 7KT PAC1600 multimeter
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●Wide-range auxiliary power supply unit (100 V AC … 240 V AC)
●Two-level password protection for settings
●Backup copy of original settings
●Texts available in six languages
Display indications
①
Measured variable display
②
Selected phase
③
Subpage: Measurement type
④
Communication active
⑤
Alarm icon
⑥
End-of-scale value
⑦
Bar diagram
⑧
Unit of measured variables
3.3.1
Keypad functions
Menu key
The Menu key is used for opening and closing the display and setup menus.
Arrow keys , and
Arrow keys and are used for
●Scrolling between screens
●Selecting available options on the display
●Changing (increasing/decreasing) settings
The arrow key is used for
●Scrolling to subpages
●Confirming selected options
●Switching between display modes

Description
3.3 7KT PAC1600 multimeter
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Manual, 08/2018, 2514284149-01 17
Access the main menu
1. Press the Menu key.
The main menu is displayed with the available options:
–
SET
: Access the setup menu
–
CMD
: Access the command menu
–
PAS
: Password entry
The selected option flashes.
The text for the selection scrolls in the alphanumeric display.
Set password
If the password needs to be set, the menu opens with the
PAS
option already selected.
1. Press or to select an option.
2. Confirm with .
3. Press the Menu key to return to the measurement display.
3.3.2
Selection of measured values
Use the keys and to scroll through the measurement display pages. The current page
is indicated by the unit in the upper left section of the display.
Some measurements may not be displayed on the device depending on programming and
the connection. If you have programmed for a system without a neutral conductor, for
example, the measurements for the neutral conductor will not be displayed.

Description
3.3 7KT PAC1600 multimeter
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The key permits access to subpages on every page (e.g. to display the maximum and
minimum values for the selected measurement). The currently displayed subpage is
displayed on the bottom right by one of the following symbols:
●
IN
: Instantaneous value
Current instantaneous value of measurement, which is displayed as a default on every
change of page.
●
HI
: Highest peak
Highest value measured by the energy meter for the selected measurement Peak values
are also stored and retained when the power supply is switched off. A special command
exists for resetting the stored peak values. You can find more information on this in
chapter Command menu (Page 36).
●
LO
: Lowest value
Measured by the energy meter from the time when voltage was present. You can reset
this value with the same command that is used for HI values. You can find more
information on this in chapter Command menu (Page 36).
●
AV
: Average value
Time-integrated (average) value of measurement. You can find more information on
parameter "M04 Integration" in chapter Parameter tables (Page 28).
●
MD
: Max. demand values
This is stored in non-volatile memory and can be reset using a special command.
Programming functions
●You can select the page and the subpage to which the display automatically returns after
a defined time without having to press a key.
●You can program the multimeter such that the display always shows the most recently
selected page.
●You can find information on setting up these functions under parameter P02 Utility in
chapter Parameter setting (setup) from the front panel (Page 23).
3.3.3
Display
Note
The lines printed in bold
in the table may not be displayed if the function or parameter which
controls
them is not activated.
Example:
If no alarm is programmed, the corresponding page is not visible.
Pages and subpages are selected with the following keys:
●Select pages with /
●Select subpages with