Shinkawa VM-21 Series User manual

MANUAL No. 20606E1.2
Published in Jul. 2006
Revised in Sep. 2010
zCarefully read and understand this manual before using this equipment.
zAfter reading this manual, store it in a safe location where it can be
consulted at any time.
VM-21 Series
VM-21P
3-WIRE LVDT SIGNAL CONDITIONER
INSTRUCTION MANUAL

VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
Thank you for purchasing the VM-21 Series VM-21P 3-Wire LVDT Signal Conditioner.
This instruction manual explains the operation of and cautionary instructions for the VM-21 Series
VM-21P 3-Wire LVDT Signal Conditioner.

Important Information
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 1 -
▌Important Information▐
►Carefully read and understand this manual before using this product. After reading this manual,
store it in a safe location where it can be consulted at any time.
►If you have any questions regarding this manual or the product, contact the sales office where it
was purchased for assistance.
►When using this product, it is necessary to be knowledgeable about not only the information in
this manual, but also any instrumentation that is connected to this product. Also, general
knowledge about safety is required in addition to the safety information provided in this manual.
►The VM-21 Series uses a variety of noise tests to evaluate EMC (electro-magnetic compatibility).
However, since the following environmental conditions will cause fluctuations in EMC
characteristics, it is important to ensure the stability of the system according to the cautionary
instructions found in this manual.
yVolume of noise produced
yTemperature and humidity
yEquipment layout
►If this product is combined with other instrumentation and then resold or transferred as part of an
assembly, be sure that this manual is given to the end user.
►When disposing of this product, follow all local laws and regulations.
►This product is used in combination with the VM-21G Signal Conditioner socket and the VM-21H
backplane unit (sold separately). Some descriptions of these parts are included in this manual,
when explaining how to install and wire this product.
►The illustrations in this manual of parts that are sold separately may differ from their actual
appearance.
►The company and product names appearing in this manual are the trademarks and registered
trademarks of those companies.
►Shinkawa Sensor Technology, Inc. owns the copyright to this manual. No part of this manual
may be made public or copied/duplicated in any manner without permission.

Important Information
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 2 -
▌Liability▐
►Shinkawa Sensor Technology, Inc. shall not be liable for any damage or injury that occurs as a
result of failure to observe the instructions in this manual, or careless operation or installation of
this product.
►Compensation shall not be made for any damage, injury, or loss that occurs as a direct or
indirect result of the incorrect use, improper use, modification, or disassembly of this product.
►Shinkawa Sensor Technology, Inc. does not provide, implicitly or otherwise, any guarantee for
merchantability, specific uses, or patent violation, beyond what is indicated in this manual and
warranty provisions.
►The warranty provisions for this product are included at the back of this manual. In the event of
trouble with this product, repairs will be performed according to these warranty provisions.
►Shinkawa Sensor Technology, Inc. shall not be liable for any trouble that occurs as a result of
the use of parts other than those that have been recommended.
▌Checking the Product and Packaging▐
Shinkawa Sensor Technology, Inc. performs vigorous quality control and quality inspections, to
provide highly reliable products.
When this product is delivered, make sure it is the product that was ordered, and check for any
damage that may have occurred during shipment and any missing accessories.
If the product is damaged or accessories are missing, contact the sales office where the product
was purchased for assistance.
In addition to this manual, the following product is included:
●VM-21P 3-Wire LVDT Signal Conditioner (this product)
●VM-21G Signal Conditioner Socket
1章

Contents
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 3 -
▌Contents▐
Page
Important Information .............................................................................................................1
Liability ...................................................................................................................................2
Checking the Product and Packaging....................................................................................2
Section 1 Safety Information ..............................................................................................4
1.1 Warning symbols........................................................................................4
1.2 Cautions .....................................................................................................4
Section 2 Introduction.........................................................................................................6
2.1 Scope of application...................................................................................6
2.2 Specifications .............................................................................................6
2.2.1 Product specifications .....................................................................6
2.2.2 VM-21G Signal Conditioner Socket
Specifications ..................................................................................8
2.2.3 VM-21H Backplane Unit (sold separately) Specifications ...............9
2.2.4 VM-21H Backplane Unit (sold separately)
Expansion Specifications ..............................................................11
2.3 External dimensions and part names .......................................................12
2.3.1 External dimensions and part names............................................12
2.3.2 VM-21G Signal Conditioner Socket
External dimensions and part names............................................12
2.3.3 VM-21H Backplane Unit (sold separately)
External dimensions and part names............................................13
Section 3 Installation ........................................................................................................14
3.1 Installation environment ...........................................................................15
3.2 Installing the product ................................................................................17
3.2.1 Using a signal conditioner socket for installation ..........................17
3.2.2 Using a backplane unit for installation...........................................19
3.3 Wire connections......................................................................................20
3.3.1 Connecting the transducer ............................................................20
3.3.2 Connecting the output signal receiver...........................................25
3.3.3 Connecting the power supply........................................................26
3.3.4 Checking connections ...................................................................27
Section 4 Corrections .......................................................................................................28
4.1 Correction preparation..............................................................................28
4.2 Correcting the product..............................................................................29
Section 5 Maintenance and Inspections...........................................................................30
5.1 Regular inspections..................................................................................30
5.2 Product life ...............................................................................................30
5.3 Troubleshooting........................................................................................30

Section 1 Safety Information
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 4 -
ATTENTION
ATTENTION
Section 1 Safety Information
Read this section carefully in order to use this product safely.
1.1 Warning symbols
The following symbols are shown with information in this manual that must be observed in order
to prevent situations that are hazardous to the user and/or could cause property damage, and to
use this product safely. Carefully read and follow the instructions.
Warning symbol Meaning
This symbol is used to warn against the possibility of serious or
fatal injury. Follow the instructions to ensure safety.
This symbol is used to caution against the possibility of injury.
Follow the instructions to ensure safety.
This symbol is used to draw attention to the possibility of property
damage.
Follow the instructions to prevent damage to equipment.
Point Point is used to emphasize important instructions, and provide helpful
information.
1.2 Cautions
Be sure to observe the following to ensure safety when using this product.
▌Prohibited Actions▐
DO NOT disassemble or modify this product. Also, do not use it with any standards other than
what is indicated in the specifications.
Doing so could result in damage to the product, fire, or injury.
Do not use wireless equipment, such as transceivers, or handy phones around this product.
Exposing this product, the signal cables, or the transducer to electromagnetic waves could
result in a reduction in the precision indicated in the specifications.
WARNING
CAUTION
WARNING

Section 1 Safety Information
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 5 -
ATTENTION
▌Required Actions▐
When installing this product, be sure to follow the procedure explained in “Section 3
Installation”.
Failure to do so could result in damage to the product, fire, or injury.
●Before using this product, be sure to read the instruction manuals for the equipment to
which it is connected.
Specialized knowledge of both equipment and related instrumentation is required to use
this product.
●Before touching this product, be sure to touch a nearby metal area to discharge any static
electricity.
Failure to do so could cause this product to be damaged by static electricity that has built
up in your body.
●Use a delayed circuit protector.
Failure to do so could result in the product becoming damaged by the inrush electrical
current when the power supply is turned on. The level of inrush current is several times
greater than normal input current. (The level of inrush current will differ depending upon
the timing when the power supply is turned on, and the impedance of the supply source.)
●When performing a mega test (insulation test) on signal transmission cables, be sure to
remove the cables from the driver (transducer) and signal conditioner.
In addition, be sure to short-circuit the cables before reconnecting them after a mega test
to discharge any electrical charge.
Connecting cables with an electrical charge to the driver or signal conditioner could result
in damage to the product.
●Perform the following measures to ensure the stability of the system.
-Be sure to install surge killers on the product and related equipment, as well as on the
relays around the signal cables connecting the equipment.
-Tighten installation screws to securely fix all units.
-Install an interlock function on the system to prevent misoperation in the event of
trouble with the product.
●If any of the following situations occur, stop using the product and contact the sales office
where it was purchased for assistance.
Continuing to use the product in abnormal conditions could result in fire or damage.
-When the product emits foul odors
-When the product becomes abnormally hot
-When the product falls or is dropped
-When the product’s case becomes damaged
●When storing the product, place it in a location free from direct sunlight. Store it in a
location free from high temperature, high humidity, and corrosive gas.
-Temperature:
−40 to 70°C
-Humidity: 10 to 90％RH (no condensation)
WARNING

Section 2 Introduction
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 6 -
Section 2 Introduction
2.1 Scope of application
This product is used in combination with either the VM-21G Signal Conditioner Socket, or the
VM-21H Backplane Unit (sold separately), and receives signals from a 3-WIRE LVDT SIGNAL
CONDITIONER (LVDT), and converts them to insulated 4 to 20mA DC or 1 to 5V DC.
Do not use for any other purposes.
2.2 Specifications
2.2.1 Product specifications
Power supply Measuring range Input LVDT Full range of
input LVDT Output Conditioner socket
1 24VDC 20 25mm
S LS Series 050 50mm 1 1 to 5VDC 0 Without
2 100 to 240VAC/DC 21 50mm 100 100mm 2 4 to 20mADC 1 Include
22 75mm 150 150mm
23 100mm 200 200mm
24 150mm 250 250mm
25 200mm 300 300mm
26 250mm 350 350mm
27 300mm 400 400mm
28 350mm 450 450mm
30 400mm
31 450mm
*1 Abnormal condition
• When there is an abnormality in the LVDT or signal cable (breaking in LVDT wiring, breaking or short circuit in signal cable).
• When there is an abnormality in LVDT excitation output (oscillation has stopped).
Input LVDT LS Series
Measuring Range See Model Code above
Output (isolated) 1 to 5VDC (output resistance: 250) or 4 to 20mADC (permissible load resistance: 600or less)
I/O Conversion Accuracy
±1% of F.S. at 25°C, ±2% of F.S. at 0 to 50°C
Deviation from an ideal linear output of voltage or current in combination with LS Series LVDT.
However, when measuring range and full range of input LVDT are the same.
Response Speed τ=45ms, 90% response
Polarity Can be changed by wiring
Burn-down Function *1 Detects transducer failure and causes the 4 to 20mADC (1 to 5VDC) output to go to less than
0.8mADC (0.2VDC).
T.P. Output (test point
output for confirmation null
point)
Output 0V when core position is on Null point.
Output impedance: 100
Output for LVDT Excitation Voltage: 5Vrms, Frequency: 3kHz, Max. current: 50mA, Sine wave
Supply Permissible Voltage 24VDC±10% or 85 to 264VAC/DC (50/60Hz)
Power Consumption 24VDC: 3.5W, 100-240VDC: 3.5W, 100-240VAC: 10VA
Insulation Resistance 100 Mminimum at 500VDC between input-output-power-GND mutually.
Withstanding Voltage 2000VAC for one minute between input-output-power-GND mutually.
(With VM-21H: 1,000VAC between output-GND.)
Operating Temperature 0 to 50°C (32 to 122°F REF.)
Relative Humidity 10 to 90%RH (no condensation)
Casing Material (color) Modified polyphenylene oxide (black)
Weight Approx. 110g (0.24lb)
CE Marking Only as for 24VDC power supply specifications.
VM-21P - S-
Standard

Section 2 Introduction
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 7 -
ATTENTION
●Standard specifications, when measuring range and full range of input LVDT are the same.
●Satisfy the following when using LS Series LVDT :
1 ≦≦2
●Satisfy the following when using single coil type LVDT except LS Series LVDT :
1)Impedance At 50% (Null point) 500 to 700Ω
(between A and C) Within LVDT stroke More than 400Ω
Core comes out Less than 250Ω
2) 4.33 × LVDT sensitivity (mV/mm/V) × Measuring range (mm) ≧1,000
●This signal conditioner does not support the zero shift function, so the null point is always the center
position of measurement.
●Abnormal condition
- When there is an abnormality in the LVDT or signal cable (breaking in LVDT wiring, breaking or short
circuit in signal cable).
However, there may be some instances where these conditions will not be detected.
-When there is an abnormality in LVDT excitation output (oscillation has stopped).
Burn-down function:
The burn-down function is used to reduce output to indicate that the product is not taking measurements.
The burn-down function is used in the following situations to reduce output to F.S. –20% (0.8mA DC or
0.2V DC) or lower.
●When there is an abnormality in the LVDT or signal cable (breaking in LVDT wiring, breaking or short
circuit in signal cable)
●When there is an abnormality in LVDT excitation output (oscillation has stopped)
The delay will be triggered and the burn-down function continued in the following situations.
●Approximately 10 seconds after a normal input signal is recovered
●Approximately 10 seconds after the power supply is turned on
Full range of input LVDT
Measuring range

Section 2 Introduction
VM-21P 3-Wire LVDT Signal Conditioner Instruction Manual
- 8 -
2.2.2 VM-21G Signal Conditioner socket specifications
Terminal screw size M3
Number of signal
conditioner mounting
stands
1
Operation temperature 0 to 50°C
Relative humidity 10 to 90%RH (no condensation)
Installation method DIN Rail, Wall-mounted
Case material (color) Polyphenylene oxide with glass fiber (black)
Mass Approx. 50g (0.11lb)
▌Terminal Arrangement▐
Terminal
No. Signal
1 INPUT(A)
2 INPUT(B)
3 INPUT(C)
4
5 T.P.OUT－
6 T.P.OUT＋
7 OUTPUT＋
8 GND
9 OUTPUT－
10 SUPPLY＋(L)
11 SUPPLY－(N)
When using above signals, refer to “3.3 Wire connections” (☞Page 20)