Vega VEGAPULS 65 User manual

Operating Instructions
Radar sensor for continuous level
measurement of liquids
VEGAPULS 65
Modbus and Levelmaster protocol
Document ID: 41365

2
Contents
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
Contents
1 About this document
1.1 Function ........................................................................................................................... 4
1.2 Target group ..................................................................................................................... 4
1.3 Symbols used................................................................................................................... 4
2 For your safety
2.1 Authorised personnel ....................................................................................................... 5
2.2 Appropriate use................................................................................................................ 5
2.3 Warning about incorrect use............................................................................................. 5
2.4 General safety instructions............................................................................................... 5
2.5 CE conformity................................................................................................................... 6
2.6 NAMUR recommendations .............................................................................................. 6
2.7 Radio license for Europe .................................................................................................. 6
2.8 Radio license for USA/Canada......................................................................................... 7
2.9 Environmental instructions ............................................................................................... 7
3 Product description
3.1 Conguration.................................................................................................................... 8
3.2 Principle of operation........................................................................................................ 9
3.3 Packaging, transport and storage................................................................................... 10
3.4 Accessories and replacement parts ............................................................................... 10
4 Mounting
4.1 General instructions ....................................................................................................... 12
4.2 Mounting instructions ..................................................................................................... 13
5 Connecting to power supply and bus system
5.1 Preparing the connection ............................................................................................... 18
5.2 Connecting..................................................................................................................... 19
5.3 Wiring plan, double chamber housing ............................................................................ 21
5.4 Double chamber housing with DIS-ADAPT .................................................................... 22
5.5 Switch-on phase............................................................................................................. 23
6 Set up the sensor with the display and adjustment module
6.1 Adjustment volume......................................................................................................... 24
6.2 Insert display and adjustment module............................................................................ 24
6.3 Adjustment system......................................................................................................... 25
6.4 Measured value indication - Selection national language............................................... 26
6.5 Parameter adjustment .................................................................................................... 26
6.6 Saving the parameter adjustment data........................................................................... 44
7 Setting up sensor and Modbus interface with PACTware
7.1 Connect the PC.............................................................................................................. 45
7.2 Parameter adjustment .................................................................................................... 46
7.3 Set instrument address .................................................................................................. 48
7.4 Saving the parameter adjustment data........................................................................... 49
8 Diagnosis, asset management and service
8.1 Maintenance .................................................................................................................. 50
8.2 Measured value and event memory ............................................................................... 50
8.3 Asset Management function........................................................................................... 51
8.4 Rectify faults................................................................................................................... 54

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Contents
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
8.5 Exchanging the electronics module................................................................................ 55
8.6 Software update ............................................................................................................. 55
8.7 How to proceed if a repair is necessary.......................................................................... 56
9 Dismount
9.1 Dismounting steps.......................................................................................................... 57
9.2 Disposal ......................................................................................................................... 57
10 Supplement
10.1 Technical data ................................................................................................................ 58
10.2 Basics Modbus............................................................................................................... 63
10.3 Modbus register ............................................................................................................. 64
10.4 Modbus RTU commands ............................................................................................... 67
10.5 Levelmaster commands ................................................................................................. 70
10.6 CongurationoftypicalModbushosts ........................................................................... 73
10.7 Dimensions .................................................................................................................... 77
Safety instructions for Ex areas
TakenoteoftheExspecicsafetyinstructionsforExapplications.
These instructions are attached as documents to each instrument
with Ex approval and are part of the operating instructions manual.
Editing status: 2016-01-29

4
1 About this document
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
1 About this document
1.1 Function
This operating instructions manual provides all the information you
need for mounting, connection and setup as well as important instruc-
tionsformaintenanceandfaultrectication.Pleasereadthisinforma-
tion before putting the instrument into operation and keep this manual
accessible in the immediate vicinity of the device.
1.2 Target group
This operating instructions manual is directed to trained specialist
personnel.The contents of this manual should be made available to
these personnel and put into practice by them.
1.3 Symbols used
Information, tip, note
This symbol indicates helpful additional information.
Caution: If this warning is ignored, faults or malfunctions can result.
Warning: If this warning is ignored, injury to persons and/or serious
damage to the instrument can result.
Danger: If this warning is ignored, serious injury to persons and/or
destruction of the instrument can result.
Ex applications
This symbol indicates special instructions for Ex applications.
• List
The dot set in front indicates a list with no implied sequence.
→ Action
This arrow indicates a single action.
1 Sequence of actions
Numbers set in front indicate successive steps in a procedure.
Battery disposal
This symbol indicates special information about the disposal of bat-
teries and accumulators.

5
2 For your safety
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
2 For your safety
2.1 Authorised personnel
All operations described in this operating instructions manual must
be carried out only by trained specialist personnel authorised by the
plant operator.
During work on and with the device the required personal protective
equipment must always be worn.
2.2 Appropriate use
VEGAPULS 65 is a sensor for continuous level measurement.
Youcannddetailedinformationabouttheareaofapplicationin
chapter "Product description".
Operational reliability is ensured only if the instrument is properly
usedaccordingtothespecicationsintheoperatinginstructions
manual as well as possible supplementary instructions.
2.3 Warning about incorrect use
Inappropriate or incorrect use of the instrument can give rise to
application-specichazards,e.g.vesseloverllordamagetosystem
components through incorrect mounting or adjustment. Also the pro-
tectivecharacteristicsoftheinstrumentcanbeinuenced.
2.4 General safety instructions
This is a state-of-the-art instrument complying with all prevailing
regulations and guidelines. The instrument must only be operated in a
technicallyawlessandreliablecondition.Theoperatorisresponsible
for the trouble-free operation of the instrument.
During the entire duration of use, the user is obliged to determine the
compliance of the necessary occupational safety measures with the
current valid rules and regulations and also take note of new regula-
tions.
The safety instructions in this operating instructions manual, the na-
tional installation standards as well as the valid safety regulations and
accident prevention rules must be observed by the user.
For safety and warranty reasons, any invasive work on the device
beyond that described in the operating instructions manual may be
carried out only by personnel authorised by the manufacturer. Arbi-
traryconversionsormodicationsareexplicitlyforbidden.
The safety approval markings and safety tips on the device must also
be observed.
Depending on the instrument version, the emitting frequencies are in
the C, K or W band range.The low emitting frequencies are far below
the internationally approved limit values. When used correctly, the
device poses no danger to health.

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2 For your safety
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
2.5 CE conformity
ThedevicefulllsthelegalrequirementsoftheapplicableECguide-
lines.ByaxingtheCEmarking,weconrmsuccessfultestingofthe
product.
YoucanndtheCECerticateofConformityinthedownloadsection
of our homepage.
Electromagnetic compatibility
Instruments with plastic housing are designed for use in an industrial
environment. Nevertheless, electromagnetic interference from electri-
cal conductors and radiated emissions must be taken into account,
as is usual with class A instruments according to EN 61326-1. If the
instrumentisusedinadierentenvironment,theelectromagnetic
compatibility to other instruments must be ensured by suitable meas-
ures.
2.6 NAMUR recommendations
NAMUR is the automation technology user association in the process
industry in Germany.The published NAMUR recommendations are
acceptedasthestandardineldinstrumentation.
ThedevicefulllstherequirementsofthefollowingNAMURrecom-
mendations:
• NE 21 – Electromagnetic compatibility of equipment
• NE53–Compatibilityofelddevicesanddisplay/adjustment
components
• NE107–Self-monitoringanddiagnosisofelddevices
For further information see www.namur.de.
2.7 Radio license for Europe
The instrument is approved according to EN 302372-1/2 V1.2.1
(2011-02) for use in closed vessels.
For operation inside of closed vessels, the following conditions must
befullled:
• The instrument must be permanently mounted on a closed vessel
made of metal, reinforced concrete, or comparable attenuating
materials.
• Flanges,processttingsandmountingaccessoriesmustensure
the microwave impermeability of the vessel and not let the radar
signal escape to the outside
• If necessary, existing viewing windows in the vessel must be
coated with a microwave impermeable material (e.g. electrically
conductive coating)
• Manholesandangesonthevesselmustbeclosedandsealedto
avoid penetration of the radar signal
• The instrument should be preferably mounted on top of the vessel
with antenna orientation downward
• The instrument must only be installed and maintained by appropri-
atelyqualiedsta

7
2 For your safety
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
2.8 Radio license for USA/Canada
The instrument is in conformity with part 15 of the FCC regulations.
Take note of the following two regulations:
• This device may not cause interference, and
• This device must accept any interference, including interference
that may cause undesired operation of the device
Modicationsnotexpresslyapprovedbythemanufacturerwillleadto
expiry of the operating licence according to FCC/IC.
The instrument is in conformity with RSS-210 of the IC regulations.
The instrument may only be used in closed vessels made of metal,
concrete,orbre-reinforcedplastic.
2.9 Environmental instructions
Protection of the environment is one of our most important duties.
That is why we have introduced an environment management system
with the goal of continuously improving company environmental pro-
tection.Theenvironmentmanagementsystemiscertiedaccording
to DIN EN ISO 14001.
Pleasehelpusfulllthisobligationbyobservingtheenvironmental
instructions in this manual:
• Chapter "Packaging, transport and storage"
• Chapter "Disposal"

8
3 Product description
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
3 Product description
3.1 Conguration
Thetypelabelcontainsthemostimportantdataforidenticationand
use of the instrument:
2
1
15
13
14
12
11
5
3
6
4
7
8
10
9
Fig. 1: Layout of the type label (example)
1 Instrument type
2 Product code
3 Approvals
4 Power supply and signal output, electronics
5 Protection rating
6 Measuring range
7 Process and ambient temperature, process pressure
8 Material, wetted parts
9 Hardware and software version
10 Order number
11 Serial number of the instrument
12 Data-Matrix-Code for smartphone app
13 Symbol of the device protection class
14 ID number, instrument documentation
15 Reminder to observe the instrument documentation
The type label contains the serial number of the instrument. With it
youcanndthefollowinginstrumentdataonourhomepage:
• Product code (HTML)
• Delivery date (HTML)
• Order-specicinstrumentfeatures(HTML)
• Operating instructions and quick setup guide at the time of ship-
ment (PDF)
• Order-specicsensordataforanelectronicsexchange(XML)
• Testcerticate(PDF)-optional
Go to www.vega.com "VEGA Tools" and "Instrument search". Enter
the serial number.
Alternatively, you can access the data via your smartphone:
• Download the smartphone app "VEGA Tools" from the "Apple App
Store" or the "Google Play Store"
• Scan the Data Matrix code on the type label of the instrument or
• Enter the serial number manually in the app
Type label
Serial number - Instru-
ment search

9
3 Product description
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
Theinstrumentcontainstwodierentelectronicsinitshousingcham-
bers:
• The Modbus electronics for power supply and communication with
the Modbus-RTU
• The sensor electronics for the actual measuring tasks
2
1
Fig. 2: Position of Modbus and sensor electronics
1 Modbus electronics
2 Sensor electronics
This operating instructions manual applies to the following instrument
versions:
• Hardware from 2.1.0
• Software from 4.5.1
The scope of delivery encompasses:
• Radar sensor
• Documentation
– Quick setup guide VEGAPULS 65
– Instructions for optional instrument features
– Ex-specic"Safety instructions" (with Ex versions)
– Ifnecessary,furthercerticates
Information:
In the operating instructions manual, the optional instrument features
are described.The respective scope of delivery results from the order
specication.
3.2 Principle of operation
The VEGAPULS 65 is a radar sensor for continuous measurement of
liquids under simple process conditions. It is particularly suitable for
levelmeasurementinvesselswithsmallprocessttingsandunder
simple process conditions.
Theinstrumentcanbeusedwithproductswithanεrvalue≥1.8.The
actually achievable value depends on the measuring conditions, the
antenna system, the standpipe or bypass.
The antenna of the radar sensor emits short radar pulses with a
durationofapprox.1ns.Thesepulsesarereectedbytheproduct
and received by the antenna as echoes.The transit time of the radar
pulses from emission to reception is proportional to the distance and
Electronics design
Scope of this operating
instructions manual
Scope of delivery
Application area
Functional principle

10
3 Product description
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
hence to the level.The determined level is converted into an appropri-
ate output signal and outputted as measured value.
3.3 Packaging, transport and storage
Your instrument was protected by packaging during transport. Its
capacity to handle normal loads during transport is assured by a test
based on ISO 4180.
The packaging of standard instruments consists of environment-
friendly, recyclable cardboard. For special versions, PE foam or PE
foil is also used. Dispose of the packaging material via specialised
recycling companies.
Transport must be carried out in due consideration of the notes on the
transport packaging. Nonobservance of these instructions can cause
damage to the device.
The delivery must be checked for completeness and possible transit
damage immediately at receipt. Ascertained transit damage or con-
cealed defects must be appropriately dealt with.
Up to the time of installation, the packages must be left closed and
stored according to the orientation and storage markings on the
outside.
Unless otherwise indicated, the packages must be stored only under
the following conditions:
• Not in the open
• Dry and dust free
• Not exposed to corrosive media
• Protected against solar radiation
• Avoiding mechanical shock and vibration
• Storage and transport temperature see chapter "Supplement -
Technical data - Ambient conditions"
• Relative humidity 20 … 85 %
3.4 Accessories and replacement parts
The display and adjustment module PLICSCOM is used for measured
value indication, adjustment and diagnosis. It can be inserted into the
sensor and removed at any time.
Youcanndfurtherinformationintheoperatinginstructions"Display
and adjustment module PLICSCOM" (Document-ID 27835).
The interface adapter VEGACONNECT enables the connection of
communication-capable instruments to the USB interface of a PC. For
parameter adjustment of these instruments, the adjustment software
PACTware with VEGA-DTM is required.
Youcanndfurtherinformationintheoperatinginstructions"Interface
adapter VEGACONNECT" (Document-ID 32628).
Packaging
Transport
Transport inspection
Storage
Storage and transport
temperature
PLICSCOM
VEGACONNECT

11
3 Product description
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
The protective cover protects the sensor housing against soiling and
intense heat from solar radiation.
Youwillndadditionalinformationinthesupplementaryinstructions
manual "Protective cover" (Document-ID 34296).
Screwedangesareavailableindierentversionsaccordingtothe
following standards: DIN 2501, EN 1092-1, BS 10, ASME B 16.5,
JIS B 2210-1984, GOST 12821-80.
Youcanndadditionalinformationinthesupplementaryinstructions
manual "Flanges according to DIN-EN-ASME-JIS".
Electronics module "VEGAPULS series 60" is a replacement part for
radarsensorsofVEGAPULSseries60.Adierentversionisavailable
for each type of signal output.
Youcanndfurtherinformationintheoperatinginstructions"Elec-
tronics module VEGAPULS series 60" (Document-ID 36801).
The supplementary electronics is a replacement part for sensors with
signal output Modbus.
Youcanndfurtherinformationintheoperatinginstructions"Supple-
mentary electronics Modbus" (Document-ID 41864).
The antenna impedance cone is a replacement part used for optimum
transmission of microwaves and for sealing against the process.
Youndfurtherinformationintheoperatinginstructions"Antenna
impedance cone VEGAPULS 62 and 68" (Document-ID 31381).
Protective cap
Flanges
Electronics module
Supplementary electron-
ics Modbus
Antenna impedance cone

12
4 Mounting
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
4 Mounting
4.1 General instructions
Oninstrumentswiththreadedprocesstting,thehexagonmustbe
tightenedwithasuitablewrench.Fortheproperwrenchsizesee
chapter "Dimensions".
Warning:
The housing must not be used to screw the instrument in! Applying
tightening force can damage internal parts of the housing.
Protect your instrument against moisture ingress through the following
measures:
• Use the recommended cable (see chapter "Connecting to power
supply")
• Tighten the cable gland
• Whenmountinghorizontally,turnthehousingsothatthecable
gland points downward
• Loop the connection cable downward in front of the cable gland
This applies mainly to outdoor installations, in areas where humidity is
expected (e.g. through cleaning processes) and on cooled or heated
vessels.
Make sure that all parts of the instrument exposed to the process are
suitable for the existing process conditions.
These are mainly:
• Active measuring component
• Processtting
• Process seal
Process conditions are particularly:
• Process pressure
• Process temperature
• Chemical properties of the medium
• Abrasionandmechanicalinuences
Youcannddetailedinformationontheprocessconditionsinchapter
"Technical data" as well as on the type label.
Metric threads
In the case of instrument housings with metric thread, the cable
glands are screwed in at the factory.They are sealed with plastic
plugs as transport protection.
You have to remove these plugs before electrical connection.
NPT thread
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
free openings for the cable glands are therefore covered with red dust
protection caps as transport protection.The dust protection caps do
notprovidesucientprotectionagainstmoisture.
Screwing in
Protection against mois-
ture
Suitability for the process
conditions
Cable glands

13
4 Mounting
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
4.2 Mounting instructions
The PTFE washer of the antenna encapsulation serves also as
process seal.
To compensate the normal prestress loss due to the seal materials,
youhavetousealsodiscspringsinadditiontotheangescrewsfor
fasteningPTFEplatedanges.
Werecommendexibleretainingwashers(e.g.SchnorrVSorS)or
detent edged rings (e.g. Gross VS KD).
Suitable retaining elements are also available from us.
The retaining elements are attached with the versions for process
temperatures -196 … +200 °C (-321 … +392 °F).
Size Article no. Type
M16, 5/8" 2.32880 Detent edged ring
Gross VS KD
M20, 3/4" 2.32881 Detent edged ring
Gross VS KD
M24, 7/8" 2.32882 Retaining washer
Schnorr VS or S
Tosealeectively,thefollowingrequirementsmustbefullled:
1. Makesurethenumberofangescrewscorrespondstothenum-
berofangeholes
2. Use disc springs to compensate the preload loss of the PTFE
washer
2
1
Fig. 3: Use of disc springs
1 Single disc spring
2 Laminated disc spring
3. Tighten screws with the necessary torque (see chapter "Technical
data")
Note:
It is recommended, retightening the screws in regular intervals
depending on process pressure and temperature. Recommended
torque (see chapter "Technical data").
The emitted radar impulses of the radar sensor are electromagnetic
waves. The polarisation is the direction of the electrical wave compo-
nent.Byturningtheinstrumentintheconnectionangeormounting
Sealing to the process
Polarisation

14
4 Mounting
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
boss,thepolarisationcanbeusedtoreducetheeectsoffalse
echoes.
Thepositionofthepolarisationismarkedontheprocessttingofthe
instrument.
1
Fig. 4: Position of the polarisation
1 Marking hole
When mounting the VEGAPULS 65, keep a distance of at least
500 mm (19.69 in) to the vessel wall. If the sensor is installed in the
center of dished or round vessel tops, multiple echoes can arise.
These can, however, be suppressed by an appropriate adjustment
(see chapter "Setup").
If you cannot maintain this distance, you should carry out a false
signal storage during setup.This applies particularly if buildup on the
vessel wall is expected. In such cases, we recommend repeating the
false signal storage at a later date with existing buildup.
> 500 mm
(19.69
")
Fig. 5: Mounting of the radar sensor on round vessel tops
In vessels with conical bottom it can be advantageous to mount the
sensor in the center of the vessel, as measurement is then possible
down to the lowest point of the vessel bottom.
Installation position

15
4 Mounting
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
Fig. 6: Mounting of the radar sensor on vessels with conical bottom
Donotmounttheinstrumentsinorabovethellingstream.Makesure
thatyoudetecttheproductsurface,nottheinowingproduct.
Fig. 7: Mounting of the radar sensor with inowing medium
The active part of the antenna, i.e. the conical antenna part should
protrude completely out of the socket.
Tomeetthedierentsocketdimensions,sensorsforsocketlengths
up to 50, 100 and 250 mm (2, 4, 10 in) are available.
Inowingmedium
Socket

16
4 Mounting
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
Fig. 8: Recommended socket mounting
In case of very big socket diameters, the active antenna part can
be slightly recessed in the socket. The following rule applies to the
standard version of VEGAPULS 65: Socket diameter corresponds to
max. socket height.
In liquids, direct the sensor as perpendicular as possible to the prod-
uct surface to achieve optimum measurement results.
Fig. 9: Alignment in liquids
The mounting location of the radar sensor should be a place where no
otherequipmentorxturescrossthepathoftheradarsignals.
Vessel installations, such as e.g. ladders, limit switches, heating spi-
rals, struts, etc., can cause false echoes and impair the useful echo.
Make sure when planning your measuring point that the radar sensor
has a "clear view" to the measured product.
In case of existing vessel installations, a false echo storage should be
carried out during setup.
If large vessel installations such as struts or supports cause false
echoes, these can be attenuated through supplementary measures.
Small,inclinedsheetmetalbaesabovetheinstallationsscatterthe
radarsignalsandpreventdirectinterferingreections.
Sensor orientation
Vessel installations

17
4 Mounting
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
Fig. 10: Cover at, large-area proles with deectors
If there are agitators in the vessel, a false signal storage should be
carried out with the agitators in motion.This ensures that the interfer-
ingreectionsfromtheagitatorsaresavedwiththebladesindierent
positions.
Fig. 11: Agitators
Throughtheactionoflling,stirringandotherprocessesinthevessel,
dense foams which considerably damp the emitted signals may form
on the product surface.
If foam is causing measurement errors, the largest possible radar
antenna should be used.
As an alternative, sensors with guided microwave can be used. These
areunaectedbyfoamgenerationandarebestsuitedforsuchap-
plications.
Agitators
Foam generation

18
5 Connecting to power supply and bus system
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
5 Connecting to power supply and bus
system
5.1 Preparing the connection
Always keep in mind the following safety instructions:
Warning:
Connect only in the complete absence of line voltage.
• The electrical connection must only be carried out by trained
personnel authorised by the plant operator.
• If overvoltage surges are expected, overvoltage arresters should
be installed.
The instrument requires an operating voltage of 8 … 30 V DC. Operat-
ing voltage and digital bus signal are carried on separate two-wire
connection cables.
The instrument is connected with standard two-wire, twisted cable
suitable for RS 485. If electromagnetic interference is expected which
is above the test values of EN 61326 for industrial areas, screened
cable should be used.
Use cable with round cross section for instruments with housing and
cablegland.Toensurethesealeectofthecablegland(IPprotection
rating),ndoutwhichcableouterdiameterthecableglandissuitable
for.
Useacableglandttingthecablediameter.
Make sure that the entire installation is carried out according to the
Fieldbusspecication.Inparticular,makesurethatthebusistermi-
nated with suitable terminating resistors.
Metric threads
In the case of instrument housings with metric thread, the cable
glands are screwed in at the factory.They are sealed with plastic
plugs as transport protection.
You have to remove these plugs before electrical connection.
NPT thread
In the case of instrument housings with self-sealing NPT threads, it is
not possible to have the cable entries screwed in at the factory. The
free openings for the cable glands are therefore covered with red dust
protection caps as transport protection.
Prior to setup you have to replace these protective caps with ap-
proved cable glands or close the openings with suitable blind plugs.
With plastic housing, the NPT cable gland or the Conduit steel tube
must be screwed without grease into the threaded insert.
Max. torque for all housings, see chapter "Technical data".
In systems with potential equalisation, connect the cable screen
directly to ground potential at the power supply unit, in the connection
Safety instructions
Voltage supply
Connection cable
Cable glands
Cable screening and
grounding

19
5 Connecting to power supply and bus system
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
box and at the sensor. The screen in the sensor must be connected
directly to the internal ground terminal.The ground terminal outside
on the housing must be connected to the potential equalisation (low
impedance).
In systems without potential equalisation, connect the cable screen
directly to ground potential at the power supply unit and at the sensor.
In the connection box or T-distributor, the screen of the short stub to
the sensor must not be connected to ground potential or to another
cable screen.The cable screens to the power supply unit and to the
next distributor must be connected to each other and also connected
to ground potential via a ceramic capacitor (e.g. 1 nF, 1500 V). The
low frequency potential equalisation currents are thus suppressed,
buttheprotectiveeectagainsthighfrequencyinterferencesignals
remains.
5.2 Connecting
The voltage supply and signal output are connected via the spring-
loaded terminals in the housing.
Connection to the display and adjustment module or to the interface
adapter is carried out via contact pins in the housing.
Information:
The terminal block is pluggable and can be removed from the
electronics. To do this, lift the terminal block with a small screwdriver
and pull it out. When reinserting the terminal block, you should hear it
snap in.
Proceed as follows:
1. Unscrew the housing lid
2. If a display and adjustment module is installed, remove it by turn-
ing it slightly to the left.
3. Loosen compression nut of the cable gland and remove blind
plug
4. Remove approx. 10 cm (4 in) of the cable mantle, strip approx.
1 cm (0.4 in) of insulation from the ends of the individual wires
5. Insert the cable into the sensor through the cable entry
Connection technology
Connection procedure

20
5 Connecting to power supply and bus system
VEGAPULS 65 • Modbus and Levelmaster protocol
41365-EN-160224
Fig. 12: Connection steps 5 and 6 - Single chamber housing
Fig. 13: Connection steps 5 and 6 - Double chamber housing
6. Insert the wire ends into the terminals according to the wiring plan
Information:
Solidcoresaswellasexiblecoreswithwireendsleevesareinsert-
eddirectlyintotheterminalopenings.Incaseofexiblecoreswithout
end sleeves, press the terminal from above with a small screwdriver,
the terminal opening is then free. When the screwdriver is released,
the terminal closes again.
Youcanndfurtherinformationonthemax.wirecross-sectionunder
"Technical data - Electromechanical data"
7. Check the hold of the wires in the terminals by lightly pulling on
them
8. Connect the screen to the internal ground terminal, connect the
external ground terminal to potential equalisation