LORENZ MESSTECHNIK LCV User manual
Lorenz Messtechnik GmbH Obere Schlossstrasse 127/129/131
73553 Alfdorf Phone +49 7172 93730-0, Fax +49 7172 93730-22
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Table of Content
1 Imprint / Copyright 3
2 Important Notes / Keeping 3
2.1 General Informations 3
2.2 Intended Use 5
2.3 General Hazards in the Event of non-compliance with the Safety Instructions 5
2.4 Residual Hazards 5
3 Safety and Warning Notices 5
3.1 Symbols 5
3.2 Health Protection and Safety 6
3.3 Conversions and Changes 6
3.4 CE Marking 6
4 Preamble 7
4.1 Product Description 7
4.2 Power Supply 7
4.3 Safe and Proper Use 7
4.4 Dimensions / Weight 7
5 Instruction / Description of the Operating Mode 8
5.1 Connection Assignment 8
5.2 Switching the Device on 9
5.3 Adjustments 9
5.3.1 Presettings of the Sensor Output 9
5.3.2 Presettings of the Sensitivity 9
5.3.3 Zero Point Rough 9
5.3.4 Filter 9
5.3.5 Measuring Range 9
5.4 Adjustment Description 10
5.4.1 Adjusted and Calibrated LCV with Sensor, integrated or as a DC Voltage Cable
MeasuringAmplier 10
5.4.2 Pre-adjusted LCV as a Board or Kit 10
5.4.3 Not adjusted LCV as a Board or a Kit 10
5.4.4 Adjustment to the Sensor 10
5.5 Interfaces and Connections 11
5.5.1 Connection for SG-Sensors 11
5.5.2 Evaluation Connection 11
5.5.3 Control Input, Switch-on Control Signal 11
5.6 Mounting Instructions 11
5.7 Troubleshooting 12
6 Product Phases 12
6.1 Transportation 12
6.2 Commissioning and Installation 13
6.3 Standard Operation 13
6.4 Maintenance and Cleaning 13
7 Equipment disposal 14
8 Reference Information 14
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1 Imprint / Copyright
© 2020 Lorenz Messtechnik GmbH, D-73553 Alfdorf
These operating instructions do not constitute an agreed quality agreement or durability guarantee
within the meaning of § 443 BGB (German Civil Code).
Technical changes, errors and misprints excepted.
No part of this publication may be reprinted without the written permission of Lorenz Messtechnik
GmbH, Alfdorf.
2 Important Notes / Keeping
Before installing and commissioning the device, these operating instructions, and in particular the
corresponding safety instructions, must be read. The device may only be used as described in this
manual to prevent injury or damage.
The operating instructions have been drawn up in accordance with EN 82079-1 and must be kept in
a safe place.
2.1 General Informations
Theseoperatinginstructionsareintendedfortechnicallyqualiedpersonnelwhohaveappropriate
knowledgeintheeldofmeasurementandcontroltechnology.Qualiedpersonnelarepersonswho
are familiar with the installation, operation, maintenance and repair of the device and have the appro-
priatequalications.Thepersonnelmusthaveknowledgeofthelegalandsafetyregulationsandbe
able to apply them.
Thedevicemayonlybeusedbyqualiedpersonnelinaccordancewiththetechnicaldatainconnec-
tion with the safety regulations and rules set out below. During operation, the legal and safety regula-
tions required for the respective application must also be observed. This also applies analogously to
the use of accessories.
The exact information about all safety instructions and warnings contained in these operating in-
structions as well as their correct technical implementation are prerequisites for the safe installation,
commissioning, safe operation and maintenance of Lorenz Messtechnik GmbH devices. All measures
mustonlybecarriedoutbyqualiedpersonnel.Allpersonsinvolvedintheprojectplanning,instal-
lation and operation of Lorenz Messtechnik GmbH devices must be familiar with the safety concepts
intheautomationtechnologyandbequaliedintheabove-mentionedsense.
For reasons of clarity, these operating instructions cannot cover all details and information and not all
applications for the handling of devices from Lorenz Messtechnik GmbH. Nor can all conceivable
types of installation, operation and maintenance must be taken into account.
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If further information is desired or required, or if special problems occur which are not described in
detail in these operating instructions, please contact Lorenz Messtechnik GmbH.
The devices of Lorenz Messtechnik GmbH may only be operated in accordance with the applications
described in these operating instructions. Built-in devices may only be operated if they are properly
installed.
By connecting and commissioning the device, the purchaser accepts the General Terms and Con-
ditions of Sale and Delivery of Lorenz Messtechnik GmbH. Furthermore, the buyer accepts the possi-
ble incompleteness of this operating manual and that the information contained therein may not be
complete and informations are without guarantee. Errors, misprints and changes excepted.
Intended Use, not intended Use
A device from Lorenz Messtechnik GmbH is used for display, processing and control of processes. It
must not be used as the sole means of averting dangerous conditions on machines and systems.
Machines and systems must be designed in such a way that faulty states cannot lead to a dangerous
situation for the operating personnel (e. g. through independent limit value-switches or mechanical
interlocks). In particular, it must be ensured that a the device, its malfunction or its failure does not
lead to damage to property or a loss of that can lead to danger to people. It is also important to prevent
the precautions that are taken from being cannot be circumvented for the safety of a plant. Emergen-
cystopdevicesmustremaineectiveatalltimes.
Installation Instructions
Devices from Lorenz Messtechnik GmbH must be installed and connected in compliance with the
relevant DIN and VDE standards. They must be installed in such a way that unintentional operation
issucientlyexcluded.Topreventaninterruptionofthesupplyandsignallinesfromleadingtoan
undenedor dangerousstate, appropriatehardware andsoftware safetyprecautions mustbe ob-
served.Supply and signallines mustbeinstalled insuch a waythat theydonot interferewith the functionof
the Lorenz Messtechnik GmbH by interfering signals (such as inductive or capacitive interferences).
Notes on Malfunctions, Maintenance and Repair
The devices do not contain any parts that require or can be serviced by the user. Repairs may only
be carried out by Lorenz Messtechnik GmbH. If it can be assumed that safe operation of the device is
no longer possible, it must be put out of operation immediately and secured against unintentional
operation. This applies in particular if:
• The device is visibly damaged
• The device is no longer functional
• Parts of the appliance are loose
• The connecting lines are visibly damaged
In addition, we would like to point out that all obligations of Lorenz Messtechnik GmbH arise exclusi-
vely from the respective purchase contract in which the warranty is conclusively stated.
Lorenz Messtechnik GmbH Obere Schlossstrasse 127/129/131
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2.2 Intended Use
Devices from Lorenz Messtechnik GmbH are to be used exclusively for measuring tasks and the di-
rectly associated control tasks. Any use beyond thisis considered to be improper.
The valid legal and safety regulations must be observed during measurement. The instrument is not
a safety component in the sense of its intended use and it is transported and stored properly. The
installation and commissioning, the operation and the disassembly must be carried out professionally.
2.3 General Hazards in the Event of non-compliance with the Safety
Instructions
The device complies with the current safety requirements. Residual dangers can emanate from the
device if it is improperly used and operated by untrained personnel. Any person entrusted with the
installation, operation, maintenance and repair of the device must read and understand the operating
instructions and, in particular, the safety instructions.
Incorrect use (e. g. by untrained personnel) may result in residual hazards. The operating instructions
must be read and understood by all persons involved in the installation, commissioning, maintenance,
repair, operation and dismantling of the device is trusted. The device must not be used if visible da-
mage is visible.
2.4 Residual Hazards
The system planner, equipment supplier and operator must plan, implement and be responsible for
the safety of the equipment. Other hazards must be minimized. The residual dangers of the measure-
ment technology must be pointed out and human error must be taken into account. The design of the
system must be suitable for avoiding hazards - a hazard analysis must be carried out for the system.
The applicable regulations and laws are as follows to note.
3 Safety and Warning Notices
3.1 Symbols
Warning: There is a risk of injury to persons. Damage to the machine is possible. The
accident prevention regulations of the employer‘s liability insurance association must
be observed.
Note: Important points to be observed. A note that indicates a possible danger of da-
mage to the product, process, person or the environment.
Additional information or reference to other important detailed information.
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3.2 Health Protection and Safety
To ensure that our products are safe and do not pose a health hazard, the following points must be
observed:
1. Read all relevant sections of this manual carefully before starting work.
2. All warning signs on containers and packaging must be observed.
3. Installation, operation, maintenance and repair work may only be carried out by suitably trai-
ned personnel and in accordance with the instructions given. If one of these instructions is not
followed, the user of the product bears full responsibility for any consequences that may occur.
4. Disconnect the appliance from any power supply before opening it.
5. The safety instructions must be strictly observed in order to avoid damage to property and
bodily injury - possibly even fatal ones.
3.3 Conversions and Changes
ThedevicemaynotbemodiedintermsofdesignorsafetywithouttheexpressconsentofLorenz
MesstechnikGmbH.Anymodicationexcludesanyliabilityonourpartfordamagesresultingthere-
from.Repairsandmodicationsareprohibited.
3.4 CE Marking
With the CE marking, Lorenz Messtechnik GmbH guarantees that its product meets the requirements
of the relevant EC directives.
Lorenz Messtechnik GmbH Obere Schlossstrasse 127/129/131
73553 Alfdorf Phone +49 7172 93730-0, Fax +49 7172 93730-22
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4 Preamble
4.1 Product Description
TheLCVisaDCvoltagemeasuringamplierforstraingaugesensors.WiththeLCV,theinterferen-
ce-prone SG signals are converted into standard signals, directly. The LCV supplies the sensor with
a highly accurate reference voltage, and converts the sensor signals by means of a precision ampli-
er.
A current output and a voltage output are always available, however, only one signal output variant
canbeadjusted.Variouscurrentandvoltagevariationsareconguredviajumpers,forsubsequent
changes, however, a readjustment is required.
The LCV has a control input in order to activate the 100 % control signal in the sensor (if available).
4.2 Power Supply
Mains operation
Power supply: 12V to 28VDC, min. 300 mA, safe from reverse polarity
Ripple: ≤100mVRMS
Fuse: Self-resettable fuse 200 mA
Undershoot/overshoot: Can lead to erroneous measurements or defects
Voltage peaks: Are being discharged by fast protection components
Voltagedropouts: Voltagedropoutsupto10mshavenoeect
Use only supply voltages with ground reference, switching power supplies without ground reference
can cause measurement errors.
4.3 Safe and Proper Use
Protect the device against moisture, condensation, rain, snow, etc.
Protect the device against direct solar radiation.
Protect the device against dust and pollution.
Protect the device against excessive ambient temperature.
Protect the device against excessive vibration.
4.4 Dimensions / Weight
Device dimensions: L x W x H: 110 x 25 x 25mm
Weight: 0.1 kg
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Block Diagram LCV
+12 ... 28V +12 ... 28V
Polyfuse
0,2 A
Power Supply
Control Key
e.g. PLC Control Signal Control
Signal
Common GND
Common
Ground
Out
0 ... ±10V
Out
0 ... ±10V
Out
0 ... 20 mA
Out
0 ... 20 mA
PE PE
Customer Application
Measuring Range
Detection
Measuring Range
100 nF
100 kΩ
Shielding
Excitation -
Excitation +
Signal +
Signal -
Control Signal
Excitation -
Excitation +
Signal +
Signal -
Control Signal
Sensing +
Sensing -
Shielding
Control Signal
Option
Internal
Supply
5V
Reference
Gain
Amplifier Low-Pass
Filter
Precision
Amplifier
50 Hz Zero Point
Gain
rough
Zero Point
rough
ZP+
ZP-
0 ... ±5V
12 ±8 mA
10 ±10 mA
4 ... 20 mA
I
U
V
A
Sensing strands at 6-wire
technique, only!
Evaluation DC Voltage Measuring Amplifier LCV SG-Sensor
Meas.
Range
Gain Zero Point
ZP- ZP+
Gain
rough
50 Hz
0 ... ±5V
12 ±8 mA
10 ±10 mA
4 ... 20 mA
+12 ... 28V
Common GND
Out 0 ... ±10V
Out 0 ... 20 mA
Control Signal
(optional)
Measuring Range
PE
Excitation -
Excitation +
Signal -
Signal +
Control Signal (optional)
Shielding
Evaluation DC Voltage Measuring Amplifier LCV SG-Sensor
Zero Point rough
5 Instruction / Description of the Operating Mode
5.1 Connection Assignment
(see also chapter ‘5.4 Adjustment Description’)
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5.2 Switching the Device on
The device is switched on and ready to operate as soon as it is connected to the power supply.
5.3 Adjustments
5.3.1 Presettings of the Sensor Output
Out: ±10V The output voltage can be switched over by closing jumper ±5V.
Out: 0 ... 20 mA The current output can be switched to 4 ... 20 mA / 10 ±10 mA / 12 ±8 mA
by closing the respective jumper.
Only one signal output variant can be adjusted.
5.3.2 Presettings of the Sensitivity
By factory default, the LCV is adjustable to approx. 2 mV/V. If the sensitivity of the sensor deviates
from this value, the resistance ‘Gain rough’ must be replaced. First, the sensitivity of the sensor must
bedeterminedbythedatasheet,testcerticate,sensorlabel,etc.andmultiplythisvalueby312.
Then, insert the next value from resistance row E24, small deviations can be corrected with the pot.
Example 1: 0.7 mV/V * 312 = 220 Ohm Accuracy 1 %, Design 0805 or 1206, TC max 50 ppm
Example 2: 1.0 mV/V * 312 = 300 Ohm Accuracy 1 %, Design 0805 or 1206, TC max 50 ppm
Example 3: 2.0 mV/V * 312 = 620 Ohm Accuracy 1 %, Design 0805 or 1206, TC max 50 ppm
5.3.3 Zero Point Rough
If the zero point of the sensor is further shifted by preload or similar and can therefore not be correc-
ted with the potentiometer, a ‘ZP+’ or ‘ZP-’-jumper must be bridged and a resistance decade must be
soldered to ‘Zero Point rough’, depending on the direction. The resistance decade is detuned until the
output value is close to zero. This determined value is soldered in - a small deviation can then be
corrected with the potentiometer.
5.3.4 Filter
Thedynamicissettoapprox.1kHz...-3dB,withjumper50Hz,thedynamicgetsreduced.Thelter
is useful, if interferences are on the measuring signal. This can occur if frequency converters or power
electronics are in the vicinity, or if the sensor cables were laid parallel to power lines.
5.3.5 Measuring Range
This function is only available on request with details of the measurement range resistance.
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5.4 Adjustment Description
5.4.1 Adjusted and Calibrated LCV with Sensor, integrated or as a DC Voltage Cable
MeasuringAmplier
The complete unit was adjusted and calibrated as a measurement chain, all relevant data and pin
assignmentscanbefoundonthetestcerticate.Ifoptioncontrolsignalisavailable,itcanbeswitched
on by a positive control signal or push-button. Thus, the adjustment and the calibration of the measu-
rement chain and also subsequent measuring instruments can be checked at any time.
Warning: If the connection between sensor and LCV is changed, the adjustment and thus
the calibration is invalid.
Connection Assignment
5.4.2 Pre-adjusted LCV as a Board or Kit
All sensor cables must be connected to the LCV, use only shielded cables and keep the sensor lines
as short as possible. Connect the supply and the pre-adjusted current or voltage output. If the option
control signal is available, it can be switched on via a positive control signal or a push-button. Now,
onlyaneadjustmentmustbecarriedoutbyusingthepotentiometer.
Kit: Housing close-up, see mounting manual.
Board: Touch-safe, mechanically protected, low-vibration mounting, with non-tension leads.
If in doubt, please contact the factory.
5.4.3 Not adjusted LCV as a Board or a Kit
All sensor cables must be connected to the LCV, use only shielded cables and keep the sensor lines
as short as possible. Connect the evaluation side, connect current or voltage output according requi-
rement. In order to take this LCV into operation later, the signal output variant and the sensor sensi-
tivitymustbepre-congured,rst.
5.4.4 Adjustment to the Sensor
Once all settings have been made, and the LCV is connected to the sensor and the evaluation device,
an adjustment can be performed. After a warm-up period of about 5 min., the built-in sensor is unloa-
ded and the zero value e. g. 0.00V (0 mA) is set by the zero point potentiometer. If the zero point
potentiometerisnotsucient,seechapter‘5.3.3ZeroPointRough’.
Then, 100 % load is applied, or 100 % control signal is switched and the 100 % value e. g. 10.00V
(20.00 mA) is adjusted by the gain potentiometer. After this, the zero point must be controlled and if
necessary, the adjustment must be repeated.
Green Common Ground (GND)
Shielding PE
Brown Excitation +
Yellow Signal +
Gray Control signal (option)
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5.5 Interfaces and Connections
5.5.1 Connection for SG-Sensors
Supply via LCV: 5.00V, max. 20 mA, short-circuit protected
Bridge resistance: Min. 350 Ohm, only full bridge, 4- or 6-wire
Sensitivity: Up to 0.3 mV/V - 3.5 mV/V, other values upon request
100 % control signal: Is switched via the control input
5.5.2 Evaluation Connection
Voltage output : ±10V or ±5V, max. 5 mA, output resistance < 1 Ohm
Current output: 0 ... 20 mA, 4 ... 20 mA, 12 ±8 mA, 10 ±10 mA, burden max. 400 Ohm
Only one signal output variant can be adjusted.
Note: The device must be disconnected from mains during any connection procedures. Note
the safety precautions.
5.5.3 Control Input, Switch-on Control Signal
By the control signal on the LCV, the 100 % control signal in the sensor (if available / see sensor data
sheet) can be switched on. The sensor electrically simulates a 100 % value (like 100 % load). Thus,
re-adjustment and system control of subsequent evaluation systems is possible, without having to
use a highly precise reference weight or torque on the sensor.
Control signal on: 5V ... 28V
Controlsignalo: 0V...2Vorifnodeviceisconnected
5.6 Mounting Instructions
Makesurethattheampliersideandthesensorsidecanbeclearlyassigned.Checkthedatasheet,
if necessary.
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Disassembly
• Detach the cable screw joint on the sensor side
• Turnthebluehousingpartofthereductionontheampliersidewithoutturningthecableon
the sensor side
• Then, gently pull the housing over the cable on the sensor side
Assembly
• Shift the blue housing part with the sensor sided bolted reduction, but open cable screw joint
over the board and carefully pull the sensor cable
• Screwthebluehousingpartwiththereductionontheampliersidewithoutturningthesensor
cable with the blue housing part
• Tighten the screw joint
5.7 Troubleshooting
No Output Signal available
• No supply voltage
• Sensor not connected or open circuit in the sensor cable
Voltage or Current Output in Control Limit
• Signal input is not connected or wrongly connected
• Open circuit in the sensor cable
• Sensor was overloaded
Inverted Output Signal
• Signal lines have been swapped
6 Product Phases
6.1 Transportation
Please pack the equipment suitable for transportation
The equipment may not be able to move back and forth in the package
Please protect the equipment against moisture
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6.2 Commissioning and Installation
Safety measures before the installation
Caution: The device may not be connected to the power supply system, directly. The speci-
cationsofthesupplyvoltageinchapter4.2mustbeconsidered.
Cable connections: Never connect voltage levels to unoccupied pins
6.3 Standard Operation
EMC
Caution: The device may not be exposed to higher EMS transients than determined by the
standard.
Cable
Caution: Never disconnect the connectors by pulling the cables. Always separate the connec-
tor at the plug directly.
Storage
Store the device in dry and dust-free spaces, only.
6.4 Maintenance and Cleaning
Warning: The device must be disconnected from the power supply before cleaning!
Clean the housing with a soft and slightly moisturized cloth. While cleaning, ensure that no liquids
enter the device or the connections
Preventive maintenance and inspection
Check the plug connections
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7 Equipment disposal
The device must be disposed of in accordance with the applicable legal regulations - see also our
„General Terms and Conditions of Delivery and Sale“ at www.lorenz-messtechnik.de
8 Reference Information
080987: Data sheet of the strain gauge sensor-interface LCV.
Table of contents
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