MR MSENSE VAM User manual

Monitoring system
MSENSE® VAM
Operating Instructions
6796573/02 EN

© All rights reserved by Maschinenfabrik Reinhausen
Dissemination and reproduction of this document and use and disclosure of its content are strictly prohibited
unless expressly permitted.
Infringements will result in liability for compensation. All rights reserved in the event of the granting of patents,
utility models or designs.
The product may have been altered since this document was published.
We reserve the right to change the technical data, design and scope of supply.
Generally the information provided and agreements made when processing the individual quotations and orders
are binding.
The original operating instructions were written in German.

Table of contents
Maschinenfabrik Reinhausen GmbH 2021 36796573/02 EN MSENSE® VAM
Table of contents
1 Introduction......................................................................................................................... 7
1.1 Manufacturer....................................................................................................................................... 7
1.2 Completeness..................................................................................................................................... 7
1.3 Safekeeping........................................................................................................................................ 7
1.4 Notation conventions .......................................................................................................................... 7
1.4.1 Hazard communication system .............................................................................................................................7
1.4.2 Information system................................................................................................................................................9
1.4.3 Instruction system .................................................................................................................................................9
1.4.4 Typographic conventions ....................................................................................................................................10
2 Safety................................................................................................................................. 11
2.1 Appropriate use ................................................................................................................................ 11
2.2 Inappropriate use.............................................................................................................................. 12
2.3 Fundamental safety instructions ....................................................................................................... 12
2.4 Personnel qualification...................................................................................................................... 13
2.5 Personal protective equipment ......................................................................................................... 14
3 IT security.......................................................................................................................... 16
4 Product description.......................................................................................................... 20
4.1 MSENSE®VAM monitoring system versions................................................................................... 20
4.2 Scope of delivery .............................................................................................................................. 20
4.3 Function description.......................................................................................................................... 21
4.4 Performance features ....................................................................................................................... 22
4.5 Design............................................................................................................................................... 23
4.5.1 VS1 sensor assembly ........................................................................................................................................24
4.5.2 Control cabinet ....................................................................................................................................................24
4.6 Main screen ...................................................................................................................................... 32
4.6.1 MSENSE®VAM as an integration solution.........................................................................................................32
4.6.2 MSENSE® VAM as a standalone version...........................................................................................................33
4.7 Operating concept ............................................................................................................................ 33
5 Packaging, transport and storage .................................................................................. 38
5.1 Packaging ......................................................................................................................................... 38
5.1.1 Suitability.............................................................................................................................................................38
5.1.2 Markings..............................................................................................................................................................39

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5.2 Transportation, receipt and handling of shipments........................................................................... 39
5.3 Storage of shipments........................................................................................................................ 40
5.4 Unpacking shipments and checking for transportation damages ..................................................... 41
6 Mounting ........................................................................................................................... 43
6.1 Installing the Cap rail modules / control cabinet ............................................................................... 43
6.1.1 Installing the cap rail modules.............................................................................................................................43
6.1.2 Integration solution in the ETOS®ED motor-drive unit.......................................................................................47
6.1.3 Fitting the control cabinet to the transformer.......................................................................................................47
6.2 Mounting the vibration sensor........................................................................................................... 50
6.3 Connecting the assemblies............................................................................................................... 51
6.3.1 Cable recommendation .......................................................................................................................................51
6.3.2 Information about connecting serial interfaces RS232 and RS485.....................................................................52
6.3.3 Information about connecting analog sensors ....................................................................................................55
6.3.4 Electromagnetic compatibility..............................................................................................................................57
6.3.5 Information about laying fiber-optic cable ...........................................................................................................60
6.3.6 Connecting the vibration sensor to the control cabinet .......................................................................................61
6.3.7 Connecting the motor-drive unit controller to the monitoring system ..................................................................64
6.3.8 Connecting the temperature sensor....................................................................................................................64
6.3.9 Connecting additional leads (optional) ................................................................................................................65
6.3.10 Connecting the power supply..............................................................................................................................65
6.4 Checking functional reliability ........................................................................................................... 66
7 Commissioning................................................................................................................. 67
7.1 Visualization...................................................................................................................................... 67
7.2 Commissioning wizard...................................................................................................................... 69
7.3 Setting the language......................................................................................................................... 70
7.4 Setting date and time........................................................................................................................ 71
7.5 Name plate ....................................................................................................................................... 71
7.5.1 Enter the name plate data...................................................................................................................................71
7.5.2 Displaying the name plate...................................................................................................................................72
7.6 Setting the control system protocol (optional)................................................................................... 72
7.7 Performing tests................................................................................................................................ 72
7.7.1 Checking measured values and status of digital inputs and outputs ..................................................................73
7.7.2 Performing function tests ....................................................................................................................................73
7.7.3 Electrical high-voltage tests on the transformer ..................................................................................................73
7.7.4 Ground test .........................................................................................................................................................74

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7.7.5 Dielectric tests on transformer wiring ..................................................................................................................75
8 Operation........................................................................................................................... 76
8.1 Visualization...................................................................................................................................... 76
8.2 User administration........................................................................................................................... 78
8.2.1 User roles............................................................................................................................................................78
8.2.2 Changing the password ......................................................................................................................................80
8.2.3 Creating, editing and deleting users....................................................................................................................80
8.2.4 Setting access rights to parameters and events .................................................................................................82
8.3 Events menu..................................................................................................................................... 83
8.4 Information menu.............................................................................................................................. 87
8.5 Recorder menu ................................................................................................................................. 91
8.6 Settings menu................................................................................................................................... 94
8.7 Menu Settings > Parameters ............................................................................................................ 94
8.7.1 Menu Settings > Parameters > General..............................................................................................................95
8.7.2 Configuring the network ......................................................................................................................................97
8.7.3 Time synchronization ..........................................................................................................................................97
8.7.4 Configuring syslog.............................................................................................................................................100
8.7.5 Setting the screensaver ....................................................................................................................................101
8.7.6 Linking digital outputs and control system messages .......................................................................................101
8.7.7 Linking functions ...............................................................................................................................................103
8.7.8 Temperature monitoring....................................................................................................................................104
8.7.9 On-load tap-changer > OLTC data....................................................................................................................105
8.7.10 Power grid > Tap position monitoring................................................................................................................105
8.7.11 SCADA..............................................................................................................................................................106
8.8 Menu Settings > Events.................................................................................................................. 127
8.9 Menu Settings > DIO configuration (optional)................................................................................. 128
8.10 Menu Settings > AIO configuration (optional)................................................................................. 130
8.11 Tap position table ........................................................................................................................... 132
8.12 Menu Settings > Reset VAM .......................................................................................................... 132
8.13 Menu settings > VAM update rules................................................................................................. 133
8.14 Menu Settings > Commissioning wizard......................................................................................... 134
8.15 Menu Settings > TPLE.................................................................................................................... 134
8.15.1 Function ............................................................................................................................................................134
8.15.2 Configuring TPLE..............................................................................................................................................147
8.16 Menu Settings > Import .................................................................................................................. 150

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8.17 Menu Settings > Export .................................................................................................................. 152
8.17.1 VAM export .......................................................................................................................................................153
8.18 Menu Settings > Administration...................................................................................................... 155
9 Inspection and maintenance ......................................................................................... 156
9.1 Care ................................................................................................................................................ 156
9.2 Inspection ....................................................................................................................................... 156
9.3 Maintenance ................................................................................................................................... 156
10 Fault elimination ............................................................................................................. 157
10.1 General faults ................................................................................................................................. 157
10.2 Event messages ............................................................................................................................. 157
10.3 Human-machine interface............................................................................................................... 158
10.4 Other faults ..................................................................................................................................... 158
11 Disassembly.................................................................................................................... 159
12 Disposal........................................................................................................................... 160
13 Technical data................................................................................................................. 161
13.1 Control cabinet standalone version ................................................................................................ 161
13.1.1 Connection terminals ........................................................................................................................................162
13.2 Voltage supply ................................................................................................................................ 162
13.3 CPU (central processing unit) II...................................................................................................... 162
13.4 DIO28-15 digital inputs and outputs .............................................................................................. 164
13.5 AIO2 analog inputs and outputs .................................................................................................... 166
13.6 VI4 vibration sensor input module ................................................................................................. 167
13.7 VS1 vibration sensor...................................................................................................................... 167
13.8 Sensor cable................................................................................................................................... 168
Glossary .......................................................................................................................... 169
List of key words ............................................................................................................ 170

1 Introduction
Maschinenfabrik Reinhausen GmbH 2021 76796573/02 EN MSENSE® VAM
1 Introduction
This technical file contains detailed descriptions on the safe and proper in-
stallation, connection, commissioning and monitoring of the product.
It also includes safety instructions and general information about the prod-
uct.
This technical file is intended solely for specially trained and authorized per-
sonnel.
1.1 Manufacturer
The product is manufactured by:
Maschinenfabrik Reinhausen GmbH
Falkensteinstraße 8
93059 Regensburg
Tel.: [phone]
E-mail: [email protected]
Further information on the product and copies of this technical file are avail-
able from this address if required.
1.2 Completeness
This technical file is incomplete without the supporting documents.
The following documents are considered supporting documents:
▪ Operating instructions
▪ Connection diagrams
1.3 Safekeeping
Keep this technical file and all supporting documents ready at hand and ac-
cessible for future use at all times.
1.4 Notation conventions
This section contains an overview of the symbols and textual emphasis
used.
1.4.1 Hazard communication system
Warnings in this technical file are displayed as follows.

1 Introduction
Maschinenfabrik Reinhausen GmbH 202186796573/02 ENMSENSE® VAM
1.4.1.1 Warning relating to section
Warnings relating to sections refer to entire chapters or sections, sub-sec-
tions or several paragraphs within this technical file. Warnings relating to
sections use the following format:
WARNING Type of danger!
Source of the danger and outcome.
► Action
► Action
1.4.1.2 Embedded warning information
Embedded warnings refer to a particular part within a section. These warn-
ings apply to smaller units of information than the warnings relating to sec-
tions. Embedded warnings use the following format:
DANGER! Instruction for avoiding a dangerous situation.
1.4.1.3 Signal words and pictograms
The following signal words are used:
Signal word Definition
DANGER Indicates a hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING Indicates a hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION Indicates a hazardous situation which, if not avoided, could result
in minor or moderate injury.
NOTICE Indicates measures to be taken to prevent damage to property.
Table1: Signal words in warning notices

1 Introduction
Maschinenfabrik Reinhausen GmbH 2021 96796573/02 EN MSENSE® VAM
Pictograms warn of dangers:
Pictogram Definition
Warning of a danger point
Warning of dangerous electrical voltage
Warning of combustible substances
Warning of danger of tipping
Warning of danger of crushing
Table2: Pictograms used in warning notices
1.4.2 Information system
Information is designed to simplify and improve understanding of particular
procedures. In this technical file it is laid out as follows:
Important information.
1.4.3 Instruction system
This technical file contains single-step and multi-step instructions.
Single-step instructions
Instructions which consist of only a single process step are structured as fol-
lows:

1 Introduction
Maschinenfabrik Reinhausen GmbH 202110 6796573/02 ENMSENSE® VAM
Aim of action
üRequirements (optional).
► Step 1 of 1.
ðResult of step (optional).
ðResult of action (optional).
Multi-step instructions
Instructions which consist of several process steps are structured as follows:
Aim of action
üRequirements (optional).
1. Step 1.
ðResult of step (optional).
2. Step 2.
ðResult of step (optional).
ðResult of action (optional).
1.4.4 Typographic conventions
Typographic convention Purpose Example
UPPERCASE Operating controls, switches ON/OFF
[Brackets] PC keyboard [Ctrl] + [Alt]
Bold Software operating controls Press Continue button
…>…>… Menu paths Parameter > Control parameter
Italics System messages, error messages,
signals
Function monitoring alarm triggered
[► Number of pages] Cross reference [► Page 41].
Dotted underscore
.............................................
Glossary entry, abbreviations, defini-
tions, etc.
Glossary entry
........................
Table3: Typographic conventions used in this technical file

2 Safety
Maschinenfabrik Reinhausen GmbH 2021 116796573/02 EN MSENSE® VAM
2 Safety
▪ Read this technical file through to familiarize yourself with the product.
▪ This technical file is a part of the product.
▪ Read and observe the safety instructions provided in this chapter.
▪ Read and observe the warnings in this technical file in order to avoid func-
tion-related dangers.
▪ The product is manufactured on the basis of state-of-the-art technology.
Nevertheless, risks to life and limb for the user or impairment of the prod-
uct and other material assets due to the function may arise in the event of
improper use.
2.1 Appropriate use
The product is a monitoring system for monitoring on-load tap-changers on
power transformers/reactors. You can use the product to detect time and
amplitude anomalies in the progression of the vibro-acoustic signal sent by
the on-load tap-changer and receive event messages when anomalies are
detected.
The product is designed solely for use in electrical energy systems and facili-
ties. It may only be used in compliance with the requirements and conditions
listed in this technical file as well as the warnings in this technical file and the
warnings posted on the product. This applies throughout the service life of
the product, from delivery, installation and operation to removal and dis-
posal.
The following is considered appropriate use:
▪ Only use the product with the on-load tap-changer and the motor-drive
unit specified in the order.
▪ Only use the product for on-load tap-changers that have not already been
damaged.
▪ Operate the product in accordance with this technical file, the agreed-
upon delivery conditions and the technical data.
▪ Ensure that all necessary work is performed by qualified personnel only.
▪ Only use the equipment and special tools included in the scope of delivery
for the intended purpose and in accordance with the specifications of this
technical file.
▪ Only use the product on transformers with insulated add-on parts after ap-
proval by Maschinenfabrik Reinhausen GmbH (special version required).
▪ Only operate the product in industrial areas. Observe the notices in this
technical file regarding electromagnetic compatibility and the technical
data.

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2.2 Inappropriate use
▪ The product is not suitable for extending the permitted service life of the
on-load tap-changer specified by the on-load tap-changer manufacturer.
▪ The product is not a protective device. Do not use it to handle safety-re-
lated functions.
▪ Risk of explosion and fire from highly flammable or explosive gases, va-
pors, or dusts. Do not operate the product in areas at risk of explosion.
▪ The product is not intended for use in environments subject to strong cor-
rosion effects.
▪ Unauthorized or inappropriate changes to the product may lead to per-
sonal injury, material damage and operational faults. Only modify the
product after consultation with Maschinenfabrik Reinhausen GmbH.
2.3 Fundamental safety instructions
To prevent accidents, malfunctions and damage as well as unacceptable ad-
verse effects on the environment, those responsible for transport, installa-
tion, operation, maintenance and disposal of the product or parts of the prod-
uct must ensure the following:
Personal protective equipment
Loosely worn or unsuitable clothing increases the danger of becoming
trapped or caught up in rotating parts and the danger of getting caught on
protruding parts. This poses a danger to life and limb.
▪ Wear appropriate personal protective equipment such as a helmet, work
gloves, etc. for the respective activity.
▪ Never wear damaged personal protective equipment.
▪ Never wear rings, necklaces, or other jewelry.
▪ If you have long hair, wear a hairnet.
Work area
Untidy and poorly lit work areas can lead to accidents.
▪ Keep the work area clean and tidy.
▪ Make sure that the work area is well lit.
▪ Observe the applicable laws for accident prevention in the relevant coun-
try.
Working during operation
The product may only be operated in a sound, operational condition. Other-
wise it poses a danger to life and limb.
▪ Regularly check the operational reliability of safety equipment.
▪ Comply with the inspection work, maintenance work and maintenance in-
tervals described in this technical file.

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Securing the motor-drive unit
If you open the motor-drive unit during operation, there is a danger of electric
shock due to live components behind the swing frame.
▪ Secure the motor-drive unit against unauthorized opening during opera-
tion by using a padlock.
▪ The motor-drive unit may only be opened by an electrically skilled person.
Safety markings
Warning signs and safety information plates are safety markings on the
product. They are an important aspect of the safety concept.
▪ Observe all safety markings on the product.
▪ Make sure all safety markings on the product remain intact and legible.
▪ Replace safety markings that are damaged or missing.
Ambient conditions
To ensure reliable and safe operation, the product must only be operated
under the ambient conditions specified in the technical data.
▪ Observe the specified operating conditions and requirements for the in-
stallation location.
Modifications and conversions
Unauthorized or inappropriate changes to the product may lead to personal
injury, material damage and operational faults.
▪ Only modify the product after consultation with Maschinenfabrik Rein-
hausen GmbH.
Spare parts
Spare parts not approved by Maschinenfabrik Reinhausen GmbH may lead
to physical injury, damage to the product and malfunctions.
▪ Only use spare parts that have been approved by Maschinenfabrik Rein-
hausen GmbH.
▪ Contact Maschinenfabrik Reinhausen GmbH.
2.4 Personnel qualification
The person responsible for assembly, commissioning, operation, mainte-
nance and inspection must ensure that the personnel are sufficiently quali-
fied.

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Electrically skilled person
The electrically skilled person has a technical qualification and therefore has
the required knowledge and experience, and is also conversant with the ap-
plicable standards and regulations. The electrically skilled person is also pro-
ficient in the following:
▪ Can identify potential dangers independently and is able to avoid them.
▪ Is able to perform work on electrical systems.
▪ Is specially trained for the working environment in which (s)he works.
▪ Must satisfy the requirements of the applicable statutory regulations for
accident prevention.
Electrically trained persons
An electrically trained person receives instruction and guidance from an
electrically skilled person in relation to the tasks undertaken and the poten-
tial dangers in the event of inappropriate handling as well as the protective
devices and safety measures. The electrically trained person works exclu-
sively under the guidance and supervision of an electrically skilled person.
Operator
The operator uses and operates the product in line with this technical file.
The operating company provides the operator with instruction and training
on the specific tasks and the associated potential dangers arising from im-
proper handling.
Technical Service
We strongly recommend having maintenance, repairs and retrofitting carried
out by our Technical Service department. This ensures that all work is per-
formed correctly. If maintenance is not carried out by our Technical Service
department, please ensure that the personnel who carry out the mainte-
nance are trained and authorized by Maschinenfabrik Reinhausen GmbH to
carry out the work.
Authorized personnel
Authorized personnel are trained by Maschinenfabrik Reinhausen GmbH to
carry out special maintenance.
2.5 Personal protective equipment
Personal protective equipment must be worn during work to minimize risks to
health.
▪ Always wear the personal protective equipment required for the job at
hand.
▪ Never wear damaged personal protective equipment.
▪ Observe information about personal protective equipment provided in the
work area.

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Protective clothing Close-fitting work clothing with a low tearing strength,
with tight sleeves and with no protruding parts. It mainly
serves to protect the wearer against being caught by
moving machine parts.
Safety shoes To protect against falling heavy objects and slipping on
slippery surfaces.
Safety glasses To protect the eyes from flying parts and splashing liq-
uids.
Visor To protect the face from flying parts and splashing liq-
uids or other dangerous substances.
Hard hat To protect against falling and flying parts and materials.
Hearing protection To protect against hearing damage.
Protective gloves To protect against mechanical, thermal, and electrical
hazards.
Table4: Personal protective equipment

3 IT security
Maschinenfabrik Reinhausen GmbH 202116 6796573/02 ENMSENSE® VAM
3 IT security
Observe the following recommendations for secure operation of the product.
General
▪ Ensure that only authorized personnel have access to the device.
▪ Only use the device within an ESP (electronic security perimeter). Do not
connect the device to the Internet in an unprotected state. Use mecha-
nisms for vertical and horizontal network segmenting and security gate-
ways (firewalls) at the transition points.
▪ Ensure that the device is only operated by trained personnel who are fa-
miliar with IT security.
Commissioning
Observe the following recommendations for device commissioning:
▪ User IDs must be unique and assignable. Do not use a "Group account"
function or the "Auto login" function.
▪ Activate the "Auto logout" function.
▪ Restrict the rights of the individual user groups as much as is feasible; this
helps avoid errors during operations. A user with the "Operator" role, for
example, should only perform operations and should not be able to
change any device settings.
▪ Delete or disable the default "admin" user ID. This requires first creating a
new user account with the "Administrator" role. You can then use it to
delete or disable the default "admin" account.
▪ Deactivate service user access.
▪ Enable SSL/TLS encryption; access to the device is then only possible us-
ing the SSL/TLS protocol. In addition to encrypting communication, this
protocol also checks the authenticity of the server.
▪ Use TLS version 1.2 or higher wherever possible.
▪ Integrate the device into a public key infrastructure. Create your own SSL
certificates for this if necessary and then import them.
▪ Connect the device to a central log server by using the syslog interface
[►Section 8.7.4, Page 100].
Operation
Observe the following recommendations during device operation:
▪ Change the password at regular intervals.
▪ Export the security log at regular intervals.
▪ Check the log files regularly for unauthorized system access and other se-
curity-related events.
Interfaces
The device uses the following interfaces for communication:

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Figure1: ETH1.1 interface on the OT1205 assembly
Interface Protocol Port Description
ETH1.1 TCP 21 FTP service access 1)
ETH1.1 TCP 80 Web visualization 1)
ETH1.1 TCP 443 SSL-protected web visualization
ETH1.1 TCP 990 SSL-protected FTP service access
ETH1.1 TCP 8080 Web visualization (alternative port) 1)
ETH1.1 TCP 8081 SSL-protected web visualization (alternative
port)
Table5: Interfaces and open ports of the OT1205 assembly
1) Port is closed if you activate the device's SSL encryption.
Figure2: Interfaces of the CPU assembly

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Interface Protocol Port Description
CAN 1 - - Connection of the DIO assembly
CAN 2 - - Communication with other ISM® devices
(e.g. parallel operation)
COM 1 - - Internal system interface
COM 2 - - Serial interface (SCADA)
USB - - Import or export of data
ETH 1 TCP 80 HTTP for web-based visualization1), 2)
ETH 1 TCP 443 HTTPS for web-based visualization1), 2)
ETH 1 TCP 102 IEC61850
ETH 1 TCP 502 Modbus3)
ETH 1 TCP 20000 DNP33)
ETH 2.x TCP 21 FTP1) (only for MR service)
ETH 2.x TCP 80 HTTP for web-based visualization1)
ETH 2.x TCP 443 HTTPS for web-based visualization1)
ETH 2.x TCP 990 FTPS (only for MR service)
ETH 2.x TCP 8080 HTTP for web-based visualization1)
ETH 2.x TCP 8081 HTTPS for web-based visualization1)
Table6: Interfaces and open ports of the CPU assembly
1) Port is closed if you activate the device's SSL encryption.
2) Depending on the setting of the parameter Visualization release.
3) Default setting; if you have modified the port for the control system proto-
col, only the set port is opened.
Encryption standards
The device supports the following TLS versions:
▪ TLS 1.0
▪ TLS 1.1
▪ TLS 1.2

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Maschinenfabrik Reinhausen GmbH 2021 196796573/02 EN MSENSE® VAM
The device uses the following cipher suites for a TLS-secured connection:
Key exchange Authentication Encryption Key length Operating
mode
Hash func-
tion
TLS ECDHE RSA WITH AES 128 CBC SHA1)
DHE SHA265
ECDHE ECDSA GCM SHA256
ECDH 256 CBC SHA1)
RSA1) SHA256
GCM SHA384
Table7: Cipher suite
1) Not available with TLS version >= 1.2
The device uses the SHA256 hash function to save passwords.

4 Product description
Maschinenfabrik Reinhausen GmbH 202120 6796573/02 ENMSENSE® VAM
4 Product description
4.1 MSENSE®VAM monitoring system versions
The device is available in the following versions:
▪ MSENSE® VAM:
– Standalone version in the control cabinet
▪ ETOS® ED/TD with MSENSE® VAM function:
– Integration solution in the motor-drive unit
▪ ETOS® IM with MSENSE® VAM function:
– Integration solution in the customer control cabinet (pluggable modules)
▪ MSENSE® BM with MSENSE® VAM function
4.2 Scope of delivery
Please note the following:
▪ Check the shipment for completeness using the shipping documents.
▪ Store the parts in a dry place until installation.
Depending on the product version, the following MSENSE®VAM monitoring
system assemblies are included in the scope of supply. Depending on the
order, additional ETOS® modules that are not listed in these instructions
may also be used. Also observe the corresponding operating instructions.
MSENSE® VAM: Standalone version in the control cabinet
▪ VI4 vibration sensor input module
▪ VAM sensor assembly (including VS1 vibration sensor, adapter screw
and kick guard)
▪ Sensor cable for VS1 vibration sensor
▪ Analog AIO2 or AIO4 inputs/outputs
▪ G1PULSDIMENSIONQS3.241 power supply
▪ Digital DIO28-15 or DIO42-20 inputs/outputs
▪ CPUII (central processing unit)
▪ Control cabinet
▪ Optional: MC2-2 media converter
▪ Optional: SW3-3 media converter with managed switch
▪ Optional: Display
▪ Optional: PT100 for OLTC oil temperature (temperature pocket must be
available in the on-load tap-changer head cover)1)