DEWESOFT DSI-LVDT Series Product manual

DSI-LVDT ADAPTERS
TECHNICAL REFERENCE MANUAL
DSI-LVDT V20-1
1

DSI-LVDT
TECHNICAL REFERENCE MANUAL
1. Table of contents
1. Table of contents 2
2. About this document 3
2.1. Legend 3
3. Technical data 4
3.1. Electrical specifications 4
3.1.1. Output bandwidth - Magnitude and Phase response 5
3.2. Theory of operation 7
4. Connectors 11
4.1. Input connector pinout 11
4.2. Output connector pinout 13
5. Operation 15
5.1. Connections 16
6. DSI adapters / TEDS sensor supporSt 17
6.1. Manual operation 18
7. Warranty information 20
7.1. Calibration 20
7.2. Support 20
7.3. Service/repair 20
7.4. Restricted Rights 20
7.5. Printing History 21
7.6. Copyright 21
7.7. Trademarks 21
8. Safety instructions 22
8.1. Safety symbols in the manual 22
8.2. General Safety Instructions 22
8.2.1. Environmental Considerations 22
8.2.2. Product End-of-Life Handling 22
8.2.3. System and Components Recycling 22
8.2.4. General safety and hazard warnings for all Dewesoft systems 23
9. Documentation version 26
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2. About this document
2.1. Legend
The following symbols and formats will be used throughout the document.
Important
It gives you important information about the subject.
Please read carefully!
Hint
It gives you a hint or provides additional information about a subject.
Example
Gives you an example of a specific subject.
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3. Technical data
3.1. Electrical specifications
DSI - LVDT adapter is powered by EXC voltage. LVDT adapter is compatible with SIRIUS(i) (variable EXC)
or DEWE 43A type instrument (fixed +/-5V EXC).
General specifications
Parameter
Description
Power supply Exc. Voltage
10 V – 15 V, from EXC+ to EXC- outputs
Power supply Exc. Current
44 mA, from EXC+ to EXC- outputs1
Output voltage
1.00 V = 500 mV/V2
Output bandwidth
1 kHz
Gain error
1% of Full Scale
Output TCR
55 ppm/K of Full Scale
Sensor VTR = S x d, Sensitivity
2000 mV/V maximum
Sensor supported type
Differential LVDR or RVDT, Inductive Half-Bridge LVDT
Sensor Exc. voltage
2.88 Vrms (differential)3
Sensor Exc. frequency
Selectable 4.02 kHz / 9.60 kHz typical; 2.5% error
Phase compensation
-50 °C to +85 °C at 4 kHz; -75 °C to +70 °C at 10 kHz
TEDS
1024-Bit, 1-Wire EEPROM4
Electrical specifications
4Only one device per TEDS line is supported. Can be set to internal (adapter) or external (sensor).
3Sinusoidal, 50dB THD typical, not possible to sync from adapter to adapter.
2For sensor VTR (Voltage Transfer Ratio) = 1000mV/V.
1Absolute maximum rating, specified for SIRIUSi.
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3.1.1. Output bandwidth - Magnitude and Phase response
Figure 1: Typical magnitude response for 4kHz EXC
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Figure 2: Typical phase response for 4kHz EXC
Figure 3: Typical magnitude response for 10kHz EXC
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Figure 4: Typical phase response for 10kHz EXC
3.2. Theory of operation
DSI - LVDT Adapter uses a unique ratiometric architecture to eliminate several of the disadvantages
associated with traditional approaches to LVDT interfacing. The benefits of this new circuit are: minimal
adjustments are required; temperature stability is improved; and transducer interchangeability is
improved.
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TECHNICAL REFERENCE MANUAL
Figure 5: Functional block diagram
LVDT adapter SENSE inputs are connected as B-Inputs and adapters IN are connected as A-Inputs.
Phase Lead / Lag circuit will compensate for the difference of the sensor output in reference to Exc. and
Sense inputs.
Output signal level will depend on the phase difference between sensor output and Sense inputs.
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TECHNICAL REFERENCE MANUAL
Figure 6: LVDT adapter output sensitivity to input signal phase lead/lag , 1:1 sensor
Two examples are shown for sensors with sensitivity = 0,5. Output signal level is
1 2 of the Exc. Signal. Sensor
output phase lag is 45⁰. LVDT adapter output is ≈0,35 (≈1Vexc ∙ sensitivity ∙ 0,70) according to Figure 2.
When phase compensation matches phase lead / lag of sensor output LVDT adapter output will be at its
maximum = 0,5 (=1Vexc ∙ sensitivity ∙ 1,00).
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Figure 7: Example: 45⁰ sensor output , no compensation
Figure 8: Example: 45⁰ sensor output, 45⁰ compensation
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4. Connectors
4.1. Input connector pinout
DSUB 9 connector
Figure 9: 9 pin DSUB plug
Pin
Name
I/O
Description
1
PS+
I, Power
Power Supply +
2
Out+
O, Signal
Adapter Output (Single ended) +
3
PSEn-
I, Signal
Power Supply Enable -
4
AGND
I
Analog Ground
5
Reser.
I/O
Reserved / Not Connected
6
PSEn+
I, Signal
Power Supply Enable +
7
Out-
O, Signal
Adapter Output (Ground) -
8
PS-
I, Power
Power Supply -
9
TEDS
I/O, Signal
TEDS
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LEMO 2B.308 connector
Figure 10: Lemo 8-pin plug
Pin
Name
I/O
Description
1
PS+
I, Power
Power Supply +
2
Out-
O, Signal
Adapter Output (Ground) -
3
Out+
O, Signal
Adapter Output (Single ended) +
4
PS-
I, Power
Power Supply -
5
MGND
I
Mechanical Ground, chassis
6
TEDS
I/O, Signal
TEDS
7
AGND
I
Analog Ground
8
Reser.
I/O
Reserved / Not Connected
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4.2. Output connector pinout
DSUB 9 connector
Figure 11: 9 pin DSUB receptable
Pin
Name
I/O
Description
1
Exc+
O, Power
Sensor supply, excitation +
2
In+
I, Signal
Sensor Output +
3
Sns-
I, Signal
Sense -
4
AGND
I
Analog Ground
5
Reser.
I/O
Reserved / Not Connected
6
Sns+
I, Signal
Sense +
7
In-
I, Signal
Sensor Output -
8
Exc-
O, Power
Sensor supply, excitation -
9
Reser.
I/O
Reserved / Not Connected
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LEMO 2B.308 connector
Figure 12: Lemo 8-pin receptable
Pin
Name
I/O
Description
1
Exc+
O, Power
Sensor supply, excitation +
2
In-
I, Signal
Sensor Output -
3
In+
I, Signal
Sensor Output +
4
Exc-
O, Power
Sensor supply, excitation -
5
MGND
I
Mechanical Ground, chassis
6
Reser.
I/O, Signal
Reserved / Not Connected
7
AGND
I
Analog Ground
8
Reser.
I/O
Reserved / Not Connected
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5. Operation
Connect the LVDT Adapter to your SIRIUS or DEWE43 channel and connect to SENSOR input your
sensor probe.
Figure 13: Adapter setting, frequency, phase
Depending on the sensor used, select excitation frequency of the adapter as close as possible to
frequency in sensors specifications.
With phase compensation adjust the measured output to maximum output value.
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5.1. Connections
LVDT – Differential
Half-Bridge LVDT
* 6-wire connection only shown. 4-wire also possible, connect Sns and Exc signals on the adapter
side of connector.
* Input - (pin7) shall be connected to half bridge completion resistor divider assembled with
discrete resistors with the following recommended specifications: Resistance 1kΩ, Tolerance 0.1%,
Temperature coefficient 15ppm, Power 0,125W. This connection is preferred over the previous
connection IN- to GND (so called “noisy GND”).
Figure 14: Solder side of the DB9 male, HB divider resistors
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6. DSI adapters / TEDS sensor supporSt
Since there is an inbuilt TEDS device in the adapter itself and if DSI adapters/TEDS sensors under
Hardware setup are selected, adapter will be recognised and proper EXC. Voltage will be set
automatically.
Please check if you are using the latest software where LVDT Adapter is supported.
Figure 15: Options - Settings
Figure 16: DSI adapters/TEDS sensors checkbox
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Figure 17: DSI-LVDT adapter is recognized and set automatically
6.1. Manual operation
If DSI adapters/TEDS sensors are left unchecked under Hardware setup then sensor supply and range
has to be set manually.
Figure 18: DSI adapters/TEDS sensors checkbox is left unchecked
Under Channel setup for channel N, set Excitation voltage from 10V to 15V maximum according to
Electrical Specifications.
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Figure 19: Excitation voltage setting
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7. Warranty information
Notice
The information contained in this document is subject to change without notice.
Note:
Dewesoft d.o.o. shall not be liable for any errors contained in this document. Dewesoft MAKES NO
WARRANTIES OF ANY KIND WITH REGARD TO THIS DOCUMENT, WHETHER EXPRESS OR IMPLIED.
DEWESOFT SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. Dewesoft shall not be liable for any direct, indirect, special, incidental, or
consequential damages, whether based on contract, tort, or any other legal theory, in connection with
the furnishing of this document or the use of the information in this document.
The copy of the specific warranty terms applicable to your Dewesoft product and replacement parts can
be obtained from your local sales and service office. To find a local dealer for your country, please visit
https://dewesoft.com/support/distributors
7.1. Calibration
Every instrument needs to be calibrated at regular intervals. The standard norm across nearly every
industry is annual calibration. Before your Dewesoft data acquisition system is delivered, it is calibrated.
Detailed calibration reports for your Dewesoft system can be requested. We retain them for at least one
year, after system delivery.
7.2. Support
Dewesoft has a team of people ready to assist you if you have any questions or any technical difficulties
regarding the system. For any support please contact your local distributor first or Dewesoft directly.
Dewesoft d.o.o.
Gabrsko 11a
1420 Trbovlje Slovenia
Europe Tel.: [phone]
Web: http://www.dewesoft.com
The telephone hotline is available Monday to Friday from 07:00 to 16:00 CET (GMT +1:00)
7.3. Service/repair
The team of Dewesoft also performs any kinds of repairs to your system to assure a safe and proper
operation in the future. For information regarding service and repairs please contact your local
distributor first or Dewesoft directly on https://dewesoft.com/support/rma-service.
7.4. Restricted Rights
Use Slovenian law for duplication or disclosure. Dewesoft d.o.o. Gabrsko 11a, 1420 Trbovlje, Slovenia /
Europe.
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