LS Series Linear Variable Differential Transformer ... · PDF fileMANUAL NO. 29341E3.0...

MANUAL NO. 29341E3.0 Published in Aug.1993 Revised in Feb.2009

LS Series

Linear Variable Differential Transformer

INSTRUCTION MANUAL

FOREWORD LS Series

i

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.

FOREWORD LS Series

ii

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.

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.

取扱注意:NOTICE

足掛禁止:NO STEP

TABLE OF CONTENTS LS Series

iii

1. GENERAL INFORMATION

1.1 GENERAL ······································································································ 1

1.2 OPERATING PRINCIPLE ············································································· 1

2. SPECIFICATIONS

2.1 SPECIFICATIONS ·························································································· 2

2.2 EXTERNAL DIMENSIONS ············································································· 5

3. INSTALLATION

3.1 PROCEDURE ································································································· 6

3.2 CHANGING THE DIRECTION OF

THE TERMINAL BOX CABLE OUTLET ················· 6

4. INTERCONNECTION

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

4.10 MODEL LS-T , VM-21P AND VM-5G/VM-5Y··················································· 17

1. GENERAL INFORMATION LS Series

-1-

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. The two identically wound coils, A-B and

B-C as Fig. 1 are contained in the casing. 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.

VAB=VBC

A B C

VAB VBC

VAB<VBC VAB>VBC

A B C A B C A B C

(a) 0% (b) 50%(Null position) (c) 100%

Fig. 1 Structure

Fig. 2 Operating Principle

(d) Output characteristic

A B C

Core Extension rod

VEX

100%0% Null point

|VBC|

|VAB|

|VAB|-|VBC|

0V

+V

-V

2. SPECIFICATIONS LS Series

-2-

2.1 SPECIFICATIONS 2.1.1 LS-C SPECIFICATION

• Sensor

• Transmission cable

LS-

Stroke Thread of extension rod CE marking

050 50mm M M5×0.8 100 100mm U 10-32UNF 150 150mm 200 200mm 250 250mm 300 300mm 350 350mm 400 400mm 450 450mm

C

Model Code

LW-

Cable length(L) Temperature range of cable Connector type Armor

005 5m 055 55m 105 105m 155 155m 205 205m 255 255m A -40 to +80°C R Angle type 0 Without010 10m 060 60m 110 110m 160 160m 210 210m 260 260m B -40 to +125°C S Straight type 1 With 015 15m 065 65m 115 115m 165 165m 215 215m 265 265m 020 20m 070 70m 120 120m 170 170m 220 220m 270 270m 025 25m 075 75m 125 125m 175 175m 225 225m 275 275m Standard 030 30m 080 80m 130 130m 180 180m 230 230m 280 280m 035 35m 085 85m 135 135m 185 185m 235 235m 285 285m 040 40m 090 90m 140 140m 190 190m 240 240m 290 290m 045 45m 095 95m 145 145m 195 195m 245 245m 295 295m 050 50m 100 100m 150 150m 200 200m 250 250m 300 300m

Max. length LW- A- -0 : 300m LW- B- -0 : 150m

LW- - -1 : 15m

- -

39311E3.0

/CEM


-3-

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 +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/s2 (50g REF.) at 2kHz

Magnetically Shielding Internal magnetically shielded

Standard Cable

3-cond.shielded cable with mating connector (5m, 0.75mm2(AWG No.20)) • 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)

Connected equipment VM-11P,VM-21P

SPECIFICATIONS

5Vrms, 3kHz, sine wave current capacity 50mA or more

Smoothing Circuit

Osc.

A

2.5kΩ

2.5kΩ Output

B C

LVDT

Core

Test Circuit

39311E3.0


-4-

2.1.2 LC-T SPECIFICATION

Stroke Thread of extension rod Additional spec. CE marking

050 50mm M M5×0.8 1 Hydrogen sulfide spec. 100 100mm U 10-32UNF 150 150mm 200 200mm 250 250mm 300 300mm 350 350mm 400 400mm 450 450mm

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/s2 (50g REF.) at 2kHz

Screws of terminal block M4

Applicable wire gauge 0.75 to 2mm2

Connected equipment VM-11P,VM-21P

LS- T /DF

SPECIFICATIONS

5Vrms, 3kHz, sine wave current capacity 50mA or more

Smoothing Circuit

Osc.

A

2.5kΩ

2.5kΩ Output

B C

LVDT

Core

Test Circuit

Model Code / Additional Spec. Code( ) No entry if additionalspec. code is not specified.

39312E3.0

/CEM


-5-

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 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

Dimensions (mm)

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)

3. INSTALLATION LS Series

-6-

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 ).

3. INSTALLATION LS Series

-7-

Fig.6 Terminal box assembly drawing

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)

6 Connection screw (M4)

42

72

72 Changed

ABC

42

42

72

72

C AB

42

4-M3

9 Terminal board mounting

10 Cable outlet (ø22)

1 Top cover setscrew × 4 (M3)

2 Top cover

3 Silicon rubber

4 Terminal box

5 Terminal box setscrew × 4 (M3)

7 Terminal board (steatite ø50)

8 Silicon rubber 9 Terminal board mounting

42

ø51

4-M3

6 Connection screw × 3 (M4)

Dimensions: mm

6 Connection screw (M4) 4-M3

9 Terminal board mounting

Dimensions: mm

4. INTERCONNECTION LS Series

-8-

4.1 MODEL LS-C AND VM-11P


-9-

4.2 MODEL LS-T AND VM-11P


-10-

4.3 MODEL LS-C AND VM-11P AND VM-5G


-11-

4.4 MODEL LS-T VM-11P AND VM-5G


-12-

4.5 MODEL LS-C AND VM-11P AND VM-5Y1,2,3


-13-

4.6 MODEL LS-T AND VM-11P AND VM-5Y1,2,3


-14-

4.7 MODEL LS-C AND VM-21P


-15-

4.8 MODEL LS-T AND VM-21P


-16-

4.9 MODEL LS-C AND VM-21P AND VM-5G/VM-5Y


-17-

4.10 MODEL LS-T AND VM-21P AND ＶＭ-5G/VM-5Y

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 Factory4-22 Yoshikawa-kogyodanchi, Higashi-hiroshima 739-0153, Japan Tel. +81-82-429-1118 Fax. +81-82-429-0804 [Field support & Repair Dept] E-Mail : [email protected]

LS Series Linear Variable Differential Transformer ... · PDF fileMANUAL NO. 29341E3.0...

Documents

Transcript of LS Series Linear Variable Differential Transformer ... · PDF fileMANUAL NO. 29341E3.0...