LS Series Linear Variable Differential Transformer

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MANUAL NO. 29341E3.0
Published in Aug.1993
Revised in Feb.2009
LS Series
Linear Variable Differential Transformer
INSTRUCTION MANUAL
FOREWORD
LS Series
For Use in Safety.....
Thank you for your using our LS Series Linear Variable Differential Transformer (LVDT).
SHINKAWA Sensor Technology applies strict quality control and inspections to ensure the high reliability of
its products.
To assure efficient use, please carefully read both this instruction manual and those of any related equipment
you may be using in combination with the LVDT.
! CAUTION
1. Megger (insulation) test of signal cable
When testing the insulation of the signal cable, be sure to disconnect the cable from the
LVDT and monitor.
After the test, discharge the charged electric load before connecting the cable to the LVDT
and monitor.
2. Extension rod with core
1) Handling of extension rod with core
Insert the extension rod with core straight into the LVDT. The unit will be damaged if the
extension rod is inserted diagonally or subjected to lateral pressure.
2) Insertion direction of extension rod with core
Be sure to insert the extension rod with core from the lead wire side of the LVDT.
If inserted from the opposite side, the unit cannot produce the specified accuracy.
3) Installation of extension rod with core
When the LVDT is used for measuring the valve opening, etc., it is usually not sufficient
to fix the extension rod with setscrews, because these could loosen due to the vibrations
acting on the mount. We, therefore, recommend that you fix the extension rod by welding
or the like.
4) Replacement of extension rod with core
Use the LVDT in combination with a core and extension rod having the same Serial No.
for reasons such as breakage may influence the accuracy or characteristics of the unit.
Therefore, be sure to conduct
characteristic check prior to use.
3. Cable outlet of terminal box
The terminal box of the terminal board type LVDT is provided with a ø22 hole for leading out
the cable. When shipped the cable outlet points into the direction opposite to the core
insertion port. It can be changed by 90° from each position to face into any of the other 3
directions (refer to pages 6 and 7) . For this reason, the cable outlet should be located at the
bottom, if at all possible.
i
FOREWORD
LS Series
4. Don’t step on
Never use the LVDT as a step, since this will damage the unit.
The top cover of the terminal board type bearing a below warning sign is square and fixed
with screws at its four corners to the terminal box. Therefore, its position should be changed
as desired in steps of 90
to easily visible location with respect to the installation position of
the LVDT.
取扱注意:NOTICE
足掛禁止:NO STEP
5. Environmental limits
Use the LVDT within the specified environmental limits.
If operating temperature condition exceed the maximum guaranteed limit, the irreversible
damage will result.
6. Do not measure insulation resistance and dielectric strength other than those at places
specified.
If measured, transducer damage may result.
7. Do not remodel unit without permission. Otherwise the guarantee can not be made.
8. This unit is designed for use by specialists or persons thoroughly familiar with the field.
9. Make sure that the end user receives this Instruction Manual delivered with the unit.
Before Use.....
When the unit is received, inspect it for damage suffered in transport and check whether it is the item you
ordered. In the unlikely event that it was damaged in transport or does not function according to specifications,
please contact the SHINKAWA Office or dealer nearest you.
Store the unit under the ambient conditions given in the specification.
Avoid places where it is exposed to high humidity or corrosive gases.
ii
TABLE OF CONTENTS
LS Series
1. GENERAL INFORMATION
1.1
GENERAL ······································································································
1
1.2
OPERATING PRINCIPLE
·············································································
1
2.1
SPECIFICATIONS ··························································································
2
2.2
EXTERNAL DIMENSIONS ·············································································
5
2. SPECIFICATIONS
3. INSTALLATION
3.1
PROCEDURE ·································································································
3.2
CHANGING THE DIRECTION OF
6
THE TERMINAL BOX CABLE OUTLET ·················
6
4.1
MODEL LS-C AND VM-11P ·············································································
8
4.2
MODEL LS-T AND VM-11P ·············································································
9
4.3
MODEL LS-C , VM-11P AND VM-5G······························································· 10
4.4
MODEL LS-T , VM-11P AND VM-5G ······························································· 11
4.5
MODEL LS-C , VM-11P AND VM-5Y1,2,3 ······················································· 12
4.6
MODEL LS-T , VM-11P AND VM-5Y1,2,3························································ 13
4.7
MODEL LS-C AND VM-21P ············································································· 14
4.8
MODEL LS-T AND VM-21P ············································································· 15
4.9
MODEL LS-C , VM-21P AND VM-5G/VM-5Y··················································· 16
4. INTERCONNECTION
4.10 MODEL LS-T , VM-21P AND VM-5G/VM-5Y ··················································· 17
iii
1. GENERAL INFORMATION
LS Series
1.1 GENERAL
The LS Series Linear Variable Differential Transformers (LVDT) are 3wire type LVDTs which, due to their
highly reliable design, are ideal for measuring the valve opening and thermal case growth on turbines.
• 9 types of strokes from 50 to 450 mm
• Superior vibration resistance
• High linearity of ±0.2%
1.2 OPERATING PRINCIPLE
As shown in Fig. 1, the LS Series LVDTs are 3wire type LVDTs.
B-C as Fig. 1 are contained in the casing.
The two identically wound coils, A-B and
When the extension rod is operated, the core moves in the coils
across A-B-C as shown Fig. 2 (a), (b) and (c).
According to Fig.2 (a), when a constant voltage and constant
frequency signal (VEX) is supplied across coil A-C, the relationship between impedance ZAB across coil A-B
and impedance ZBC across coil B-C becomes ZAB < ZBC, and the relationship between voltage VAB across
coil A-B and voltage VBC across coil B-C becomes VAB < VBC. Similar to above, VAB=VBC in Fig. 2 (b)
and VAB > VBC in Fig.2 (c).
ZAB and ZBC vary in proportion to the displacement of the core.
Therefore, a voltage proportional to the
displacement as shown in Fig.2 (d) can be obtained by detecting the difference between VAB and VBC.
They are not rectified before this differential calculation, phase detection is required because the phase is
inverted around the null position and the voltage value becomes symmetrical.
A
B
VEX
C
VAB
A
Core
B
VBC
C
|VBC|
Extension rod
Fig. 1 Structure
VAB<VBC
A
B
|VAB|
VAB=VBC
C
A
B
+V
0%
VAB>VBC
C
A
B
0V
Null
point
100%
C
|VAB|-|VBC|
-V
(a) 0%
(b) 50%(Null position)
(c) 100%
Fig. 2 Operating Principle
-1-
(d) Output characteristic
2. SPECIFICATIONS
LS Series
2.1 SPECIFICATIONS
2.1.1 LS-C SPECIFICATION
Model Code
•
Sensor
LSStroke
050
100
150
200
250
300
350
400
450
•
Transmission cable
50mm
100mm
150mm
200mm
250mm
300mm
350mm
400mm
450mm
C
Thread of extension rod
M
U
5m
10m
15m
20m
25m
30m
35m
40m
45m
50m
LW-
055 55m 105
060 60m 110
065 65m 115
070 70m 120
075 75m 125
080 80m 130
085 85m 135
090 90m 140
095 95m 145
100 100m 150
Max. length
105m
110m
115m
120m
125m
130m
135m
140m
145m
150m
LWLWLW-
CE marking
M5×0.8
10-32UNF
-
Cable length(L)
005
010
015
020
025
030
035
040
045
050
/CEM
155 155m 205
160 160m 210
165 165m 215
170 170m 220
175 175m 225
180 180m 230
185 185m 235
190 190m 240
195 195m 245
200 200m 250
A- -0 : 300m
B- -0 : 150m
- -1 : 15m
205m
210m
215m
220m
225m
230m
235m
240m
245m
250m
-2-
255
260
265
270
275
280
285
290
295
300
-
Temperature
range of cable
255m A
-40 to +80°C
260m B
-40 to +125°C
265m
270m
275m
280m
285m
290m
295m
300m
Connector type
R
S
Angle type
Straight type
Standard
39311E3.0
Armor
0
1
Without
With
2. SPECIFICATIONS
LS Series
SPECIFICATIONS
Stroke
50, 100, 150, 200, 250, 300, 350, 400, 450mm
Output voltage
Approx. (-0.8 to +0.8V)/full stroke to approx. (-1.3 to +1.3V)/full stroke at relay signal 5Vrms
(measured with the test circuit)
Excitation
3kHz, 5 to 20Vrms
Coil Impedance
600Ω±100Ω (3kHz)
±0.2% of 100% stroke, ±1.5% of 110% stroke
Linearity
(measured with the test circuit)
Operating temperature
-40 to +125°C (-40 to +257°F REF.)
Operating humidity range
95% RH or less (noncondensing, non-submerged)
Temperature drift
(0.03% of F.S./°C or less
Insulation Resistance
More than 10M( at 500VDC (between each pins and body)
Dielectric Strength
1mA or less at 500VAC for one minute (between each pins and body)
Shock Vibration
490m/s (50g REF.) at 2kHz
Magnetically Shielding
Internal magnetically shielded
2
2
3-cond.shielded cable with mating connector (5m, 0.75mm (AWG No.20))
Standard Cable
Connected equipment
• LW-
A-S-0(-40 to +80°C, straight type connector, without armor)
• LW-
A-S-1(-40 to +80°C, straight type connector, with armor)
• LW-
A-R-0(-40 to +80°C, angle type connector, without armor)
• LW-
A-R-1(-40 to +80°C, angle type connector, with armor)
• LW-
B-S-0(-40 to +125°C, straight type connector, without armor)
• LW-
B-S-1(-40 to +25°C, straight type connector, with armor)
• LW-
B-R-0(-40 to +125°C, angle type connector, without armor)
• LW-
B-R-1(-40 to +125°C, angle type connector, with armor)
VM-11P,VM-21P
2.5kΩ
2.5kΩ
A
B
Smoothing
Circuit
Output
C
Osc.
5Vrms, 3kHz, sine wave
current capacity 50mA or more
LVDT
Core
Test Circuit
-3-
39311E3.0
2. SPECIFICATIONS
LS Series
2.1.2 LC-T SPECIFICATION
Model Code / Additional Spec. Code(
LS-
/DF
Thread of extension rod
Stroke
050
100
150
200
250
300
350
400
450
T
50mm
100mm
150mm
200mm
250mm
300mm
350mm
400mm
450mm
M
U
M5×0.8
10-32UNF
No entry if additional
spec. code is not specified.
/CEM
Additional spec.
1
)
CE marking
Hydrogen sulfide spec.
SPECIFICATIONS
Stroke
50, 100, 150, 200, 250, 300, 350, 400, 450mm
Output voltage
Approx. (-0.8 to +0.8V)/full stroke to approx. (-1.3 to +1.3V)/full stroke at relay signal 5Vrms
(measured with the test circuit)
Excitation
3kHz,5 to 20Vrms
Coil Impedance
600Ω±100Ω(3kHz)
Linearity
±0.2% of 100% stroke, ±1.5% of 110% stroke
(measured with the test circuit)
Operating Temperature
-40 to +150°C (-40 to +302°F REF.)
Operating humidity range
95% RH or less (noncondensing, non-submerged)
Temperature drift
±0.03% of F.S./°C or less
Insulation Resistance
More than 10MΩ at 500VDC (between each terminal and body)
Dielectric Strength
1mA or less at 500VAC for one minute (Between each terminal and body)
Shock Vibration
490m/s (50g REF.) at 2kHz
Screws of terminal block
M4
Applicable wire gauge
0.75 to 2mm
Connected equipment
VM-11P,VM-21P
2
2
2.5kΩ
2.5kΩ
A
B
Smoothing
Circuit
Output
C
Osc.
5Vrms, 3kHz, sine wave
current capacity 50mA or more
LVDT
Core
Test Circuit
-4-
39312E3.0
2. SPECIFICATIONS
LS Series
2.2 EXTERNAL DIMENSIONS
Model
LS-050
LS-100
LS-150
LS-200
LS-250
LS-300
LS-350
LS-400
LS-450
Stroke (mm)
50
100
150
200
250
300
350
400
450
A
---
---
---
203
254
279
330
381
432
B
101.6
203.2
311
406
521
616
718
819
921
Dimensions
(mm)
C
---
---
---
241
292
323
374
425
476
D
63.5
89
114
140
165
206
232
257
282
E
152.4
257
362
470
584
686
787
889
991
F
25.4
25.4
25.4
38
38
44
44
44
44
G
25.4
25.4
25.4
38
38
38
38
38
38
Remarks) LS-050, LS-100 and LS-150 are provided with mounting base *2 (shown by broken line) instead of *1.
Models LS-200 to LS-450 are provided with mounting base *1 instead of *2 (shown by broken line)
-5-
3. INSTALLATION
LS Series
3.1 PROCEDURE
It is recommended that you use the LS Series Linear Variable Differential Transformer (LVDT) in
combination with the VM-11P/VM-5E, VM-11P/VM-5A or in the configuration shown in Fig.3.
A connection example for combination with the VM-11P/VM-5E, VM-5A is shown on page 8. If you use
LVDT in combination with the VM-11P/VM-5E, VM-11P/VM-5A, please also carefully read the instruction
manual of the VM-11P/VM-5E, VM-11P/VM-5A.
The null position which lies in the center (50% point) of the measuring range is marked substitutively in white
on the extension rod.
When aligned it with the end of the case, this mark can be used as a rough standard for the null position. The
exact electric null position is the point where the output voltage in the circuit shown in Fig.3 is 0V.
Changing the cable length slightly affects sensitivity. In case of a 0.75mm2 3-core shielded cable, for instance,
the sensitivity decreases by approx. 0.03% for every additional meter of cable length.
When the cable length exceeds 300m, linearity will begin to get worse.. Therefore please keep the cable
length below 300m.
3.2 CHANGING THE DIRECTION OF THE TERMINAL BOX CABLE OUTLET
The terminal box of the terminal board type LVDT is provided with a φ22 hole for leading out the cable.
When shipped the cable outlet points into the direction opposite to the core insertion port as shown in Fig.5.
However it can be changed by 90° to face into any of the other 3 directions by following the procedures. Also
refer to Fig.6.
1) Loosen the top cover setscrew ( 1 ), and take off the top cover ( 2 ).
2) Loosen the terminal box setscrew ( 5 ) inside the terminal box, and take the terminal box ( 4 ) off the
terminal board mounting base ( 9 ).
3) Both the terminal box ( 4 ) and the terminal board mounting base ( 9 ) are 72×72mm square, so that the
cable outlet (10) can be pointed into the desired direction by turning it in steps of 90°. After having made
the adjustment, fix the terminal box ( 4 ) with the terminal box setscrews ( 5 ) on the terminal board
mounting base ( 9 ).
4) Install the top cover ( 2 ) with the top cover setscrews ( 1 ) on top of the terminal box ( 4 ).
-6-
3. INSTALLATION
LS Series
10 Cable outlet
(ø22)
ø51
1
Top cover setscrew × 4 (M3)
2
Top cover
3
Silicon rubber
4
Terminal box
5
Terminal box setscrew × 4 (M3)
6
Connection screw × 3 (M4)
7
Terminal board (steatite ø50)
8
Silicon rubber
9
Terminal board mounting
4-M3
42
Dimensions: mm
The terminal board used has changed as below-note, outline dimension is the same.
As usual (old) drawing for terminal box assembly.
Supplied before Mar., 28, 1995
A new drawing for terminal box assembly.
(since supplier’s working No. 94001798 to)
9 Terminal board mounting
4-M3
9 Terminal board mounting
6 Connection screw (M4)
4-M3
6 Connection screw (M4)
A
C
A
72
42
BC
42
72
Changed
B
42
42
72
72
Fig.6 Terminal box assembly drawing
-7-
Dimensions: mm
4. INTERCONNECTION
LS Series
4.1 MODEL LS-C AND VM-11P
-8-
4. INTERCONNECTION
LS Series
4.2 MODEL LS-T AND VM-11P
-9-
4. INTERCONNECTION
LS Series
4.3 MODEL LS-C AND VM-11P AND VM-5G
-10-
4. INTERCONNECTION
LS Series
4.4 MODEL LS-T VM-11P AND VM-5G
-11-
4. INTERCONNECTION
LS Series
4.5 MODEL LS-C AND VM-11P AND VM-5Y1,2,3
-12-
4. INTERCONNECTION
LS Series
4.6 MODEL LS-T AND VM-11P AND VM-5Y1,2,3
-13-
4. INTERCONNECTION
LS Series
4.7 MODEL LS-C AND VM-21P
-14-
4. INTERCONNECTION
LS Series
4.8 MODEL LS-T AND VM-21P
-15-
4. INTERCONNECTION
LS Series
4.9 MODEL LS-C AND VM-21P AND VM-5G/VM-5Y
-16-
4. INTERCONNECTION
LS Series
4.10 MODEL LS-T AND VM-21P AND VM-5G/VM-5Y
-17-
Warranty
The warranty period for the delivered product shall be 3 years from the date of delivery from
our factory. But the warranty period for the special order product and software shall be 1 year,
and for the repairing parts shall be 6 months. In the event that the delivered product develops
any defects within the warranty period for which Shinkawa Electric is liable, the defective part
will be replaced or repaired in our factory at our own expense.
In the event that an engineer needs to be dispatched for repair purposes during the warranty
period, travel expenses for the said engineer will be changed in accordance with the above
item. The cost of repair will be borne by Shinkawa Electric.
However, the following are excluded from our warranty:
(1) Any defects due to improper handling or operation by the user.
(2) Any defects, the case of which is not attributable to Shinkawa Electric.
(3) Any modifications or repairs made by others then Shinkawa Electric or persons
commissioned by Shinkawa Electric.
(4) Any handling, storage and operation under severe environmental conditions that exceed
the design specifications.
(5) Any defects due to fire, flood, earthquake, lightning and other Acts of God.
(6) The consumables
(7) Other defects considered not to be attributable to Shinkawa Electric.
This warranty applies exclusively to the delivered product units.
Shinkawa Electric will not be held liable for consequential damage caused either directly or
indirectly through a defect of the delivered product.
The warranty period and scope of machinery and equipment made by manufacturers other
than Shinkawa Electric shall be in accordance with the conditions of the respective
manufacturer, regardless of the provisions made above.
Hiroshima Factory
4-22 Yoshikawa-kogyodanchi, Higashi-hiroshima 739-0153, Japan
Tel. +81-82-429-1118 Fax. +81-82-429-0804
[Field support & Repair Dept] E-Mail : service@sst.shinkawa.co.jp
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