20 MUBE 0/2 - Vollmer Americavollmeramerica.com/wp-content/uploads/Mube2-e1.pdf · 20 MUBE 0/2...

Service Instructions

LVDT Transducer

20 MUBE 0/2

MUBE2-e1 erstellt am 1.3.2005 geprüft am: 1.3.2005 freigegeben am: 2.3.2005 Bemerkungen:Rev.01 Seiten:22 Name: Rietdorf Name: Alder/Hertel Name: König für P 18547-Z1

2 20 MUBE -0/2 Service Instructions

measuring - controlling - recording - automation - documentation

MUBE2-e1

Table of content

Subject to change without notice

20 MUBE 0/2 .................................................................................................. 1

Table of content ............................................................................................. 2

Intended use of this product .......................................................................... 3

Spare parts ordering information .................................................................. 3Transducer with ceramic slide bushing ................................................ 5

Design and function ....................................................................................... 7

Functional check ............................................................................................ 8Transducer ram easily movable? .......................................................... 8Measurement tip OK? .......................................................................... 8Cable connections damaged? ............................................................... 8

Special tools ................................................................................................... 9

To remove the transducer ram ....................................................................... 9

To replace the measurement tip .................................................................. 10Important! ........................................................................................... 11

To clean the transducer ................................................................................ 13

To assemble the transducer ram .................................................................. 13

To insert the transducer ram ........................................................................ 14

Dismantling and assembly of the transformer unit .................................... 15

To assemble the differential transformer ................................................... 16

To fit in a new transducer ram ..................................................................... 17To remove the ferrite core .................................................................. 18To install and adjust the ferrite core ................................................... 18

Transducer adjustment ................................................................................ 20Linearization data ............................................................................... 20Linkorr installation ............................................................................. 20Connect PC to VMF ........................................................................... 20LINKORR start .................................................................................. 20Linearization data transfer .................................................................. 21

3Service Instructions 20 MUBE 0/2

FRIEDRICH VOLLMER Feinmeßgerätebau GMBH D-58093 Hagen Verbandsstraße 60 � +40 2334/507-0 Fax +49 2334/53015

MUBE2-e1

Intended use of this product

This transducer may be used only as a fix mounted component of a Vollmermeasurement machine for the measurement of cold strip or profile. It mustbe firmly installed in its intended position, must be covered and connectedas intended by the Vollmer company. Any other use might cause dam-age.

Spare parts ordering information

Please state the figures in the parts list and the drawings of this manualwhen ordering spare parts. If you use numbers taken out of another drawinginstead, please always state the number of that drawing with your sparepart order.



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*1 There are different pressure springs and different hoods installed depend-ing on the measurement direction (from the top or from the bottom side) anddepending on the type of measurement tip (round = R or edge = S).

*2 There are different coil holders used, onefor a straight outlet of the transducer cable, onefor an angular outlet.

*3 Depending on the application, these trans-ducers have a ceramic or a metal slide bush-ing. The ceramic inset is permanently connectedto the support bushing.

Spare parts for LVDT Transducer 20 MUBE 0/2

number part name order number/in part numberservice- in drawinginstruction No. W061/45/10-Bl.1

1 housing W061/45.02 D 11.1 metal slide bushing *3 W061/45.02 D 1.11.2 reduction bushing (for transformer) W061/45.02 D 1.21.4 support bushing *3 W061/45.02 D 1.41.6 ceramic slide bushing *3 W061/45.02 D 1.63.1 guide ram W061/45.02 D 3.14 protection cover (top R *1) W061/45.02 D 44.1 protection cover (top S *1) W061/45.02 D 4.14.3 protection cover (bottom R *1) W061/45.02 D 4.34.4 protection cover (bottom S *1) W061/45.02 D 4.45 dog screw W061/45.02 D 56 shoulder washer bottom W061/45.02 D 67 coil holder (angular *2) W061/45.02 D 77.1 lid W061/45.02 D 7.17.2 coil holder (straight *2) W061/45.02 D 7.17.3 coil holder (sep. comp. air conn. *2) W061/45.02 D 7.28 cable guide W061/45.02 D 88.1 plastic cable restrain W061/45.02 D 8.19 transformer coil W061/45.02 D 910 ferrite core W061/45.02 D 1011.1 rod (for ferrite core) W061/45.02 D 11.112 measurement ram W061/45.02 D 1213 measurement tip W061/45.02 D 1314 overtravel spring W061/45.02 D 1414.1 pressure spring W061/45.02 D 14.115 measurement spring W061/45.02 D 1516 grub screw W061/45.02 D 1617 grub screw W061/45.02 D 1718 grub screw W061/45.02 D 1819 coil sleeve W061/45.02 D 1920 cap nut W061/45.02 D 2024 pressure bushing W061/45.02 D 2425 rubber ring W061/45.02 D 2527 rubber ring W061/45.02 D 2728 rubber ring W061/45.02 D 2829 lock nut W061/45.02 D 2931 rubber ring W061/45.02 D 31

The part numbers in thismanual were taken fromthe drawingNo. W061/45/10-Bl.1



MUBE2-e1

2MUB0-1.TIF

Transducer with ceramic slide bushing



MUBE2-e1

A transducer cable LIYDDY 4 x 0,11B clear cable protection pipe PUR 7 x 1,5C DAV-connector with nozzle Ø 0,9mmD extension cable connector

(female, 5 contacts) CA 01 COM - E 14S - 5S - F42F plug (6 contacts) IL ST T 03000

The soldering pins on the coil are isolated with rubber sleeves of size 0,but size 1 sleeves are used for the pins in the connectors

Address: Friedrich VollmerFeinmeßgerätebau GmbHVerbandsstraße 60 bD-58093 Hagen - BerchumGermany

Phone: *49 2334 / 507-0 switchboardFax: *49 2334 / 507-199



MUBE2-e1

Design and function

Inductive transducers work as a transformer with a movable core (differ-ential transformer)

A diamond tip, especially designed for each kind of application, slidesover the surface which is to be measured. A ram passes the movementsof the tip to a ferrite core. This moves the ferrite core within the trans-former coil if the measured surface is not absolutely even.

A Vollmer measurement amplifier generates a continuous signal to theprimary winding of the transformer coil. Depending on the position ofthe ferrite core between the other (secondary) windings, the amplifier receivesa signal of different level.

The 20 MUBE 0 transducer has been designed to measure sensitive sur-faces. The ram is guided by a slide bushing of metal or ceramic. Themeasurement stroke from the zero position is +2,1 /- 2,3 mm.

The measurement pressure of the spring suspended transducer ram canbe increased pneumatically during the measurement. By switching thispressure to vacuum (DAV), the transducer ram can be lifted off the strip.This keeps the transducer tip from hitting the strip edge while the gaugeis moved on or off strip.



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Functional check

In order to avoid unnecessary dismantling of a transducer, please checkthe following points before:

Transducer ram easily movable?

Remove the ram only if the transducer measures wrong or if it has to becleaned when it is sticky because of dirt. The transducer ram has easilyto be pushed in, and must spring back immediately. If it sticks, the guidebushing is dirty or worn. The transducer ram must be easily movable alongthe full length of its stroke. If it is still not moving easy after cleaning,check the slot in the ram and the dog screw for wear. If the ram remainssticking, it has to be replaced together with the guide bushing. Or thetransducer must be sent to Vollmer for repair. Do not change parts fromone transducer to another, as some parts were fit on each other duringmanufacturing.

Clean the differential transformer with dry cloth, but do not use solvents.

If the guide ram is worn or damaged, it should be replaced. The lengthof the guide ram must then be shaped by turning off excess material on alathe, until the mechanical stroke of the transducer ram matches with thestroke of the differential transformer. This work may also be necessaryafter the transformer coil was replaced. It should only be done by serv-ice personnel who attended a special training by Vollmer. Otherwise itis recommended to send the transducer to Vollmer for servicing, withouttrying to repair it by yourself.

Measurement tip OK?

The measurement diamond has to be spherical. Worn diamonds with flatsections cause measurement errors. The diamond tip might get damagedor broken with strip breakages. Then it might leave marks on the stripand needs to be changed.

Cable connections damaged?

If the transducer doesn't measure any deflections or only deflections toone side, the cable connection to the amplifier might be damaged. Whendismantling and reinstalling a transducer, take care that no dirt falls intothe connectors and make sure that the transducers are installed in theircorrect position. Please replace damaged cables only by original Voll-mer cables. They are specially made for this application.



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Special tools

The gauge was delivered with a set of special tools. This kit contains anumber of pliers, clamping devices and spanners which were put togeth-er individually for your gauge. The following instructions refer to thesetools.

If you can't avoid to move the ferrite core rod, you need a Vollmer VMFamplifier, a connector cable and some Loctite® adhesive for readjustment.In addition, Vollmer decade switch FS3/4 or FS4/0000, a 500 or 800 µmslip gauge and a Vollmer C-frame with a fine adjustment is required forthe adjustment of the transducer and its cable, To adjust The installationof a new transducer ram requires a lathe.

To remove the transducer ram

To remove the transducer ram: First unscrew the dog screw, and then pull out theram carefully.

Transducer ram and slide bushing: After dog screw 5 has been turned out, the ram3.1 with its protection cover 4 can be removed and bushing 1.1 can be pulled offthe transducer housing.



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To replace the measurement tip

Dismantling of the transducer ram: First unscrew the two grub screws 16 whichconnect the hood and the guide ram,

... and then pull the hood 4 off the guide ram 3.1. Check and replace rubber ring28 if damaged

The measurement tip can only be replaced after the measurement ram waspushed out of the guide ram.



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Without dismantling of the ram: After the hood 4 was removed, push the guide ramback. Hold the neck of the measurement ram with the special pliers, possibly restthe pliers on a support. The ferrite core rod and the transducer ram must not getbend.

Now clamp the measurement tip into a 7,8mm clamping device and hold the neckof the measurement ram with the 4mm clamp of the pliers...

Important!

Do not put the pliers or the clamp on the narrow area (see arrow) of the measure-ment tip. This might cause deformation of the tip and lead to measurement errors.



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..while unscrewing the measurement tip

Please pay attention to the instructions for re-assembly and insertionof the transducer ram!

Transducer ram completely disassembled: 3.1 guide ram, 12 measurement ram,13 measurement tip and 4 hood with the two grub screws 16 for fastening thehood and the two rams. Do not change the position of the ferrite core unless it isgoing to be replaced.



MUBE2-e1

To clean the transducer

For cleaning, the transducer needs to be dismantled as far as to take outthe transformer unit and the complete ram. Clean housing, bushing andram thoroughly and dry them with compressed air. The bushing and theram should not be lubricated as, in this case, a lubricant would cause friction.

The transformer unit must not be cleaned with solvents but only with drycloths.

To assemble the transducer ram

Measurement tip 13 should be firmly tightened to measurement ram 12,but the small thread must not be overtightened.

Then insert the measurement ram 12 into guide ram 3.1 without pushingit in completely.

Now rotate measurement tip 13 into such a position, that the marks onthe side of the measurement tip line up with the holes for the grub screwsin the guide ram 3.1. The marks are caused by the two grub screws 16,and they are only existing on measurement tips which have already beeninstalled before.

In this position push the measurement ram completely into the guide ramuntil it stops. Put the hood on top and lock all parts firmly together withthe two grub screws 16.



MUBE2-e1

To insert the transducer ram

To insert the slide bushing: After cleaning, the bushing is inserted as shown, withthe two holes lined up.

Insertion of the transducer ram: The ram is inserted so that its slot is aligned withthe holes in the bushing and the transducer housing.

Use a small screwdriver to align bushing and ram before tightening the dog screw.It should be easily screwed in without showing considerable resistance before thescrew head is flush with the transducer housing.



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Dismantling and assembly of the transformer unit

To remove the transformer unit: Clamp the transducer housing into a 20 mm clampingdevice (supplied with the gauge) and unscrew the cap nut 20. During assemblypress down the coil holder, while tightening the cap nut.

After the transformer unit S was removed, the coil sleeve 19, overtravel spring 14and washer 6 can be removed. Do not use solvent to clean the transformer unit.



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To assemble the differential transformer

Transformer unit disassembled: Cap 7.1, cap nut 20, coil holder 7, rubber ring 25,plastic pressure bushing 24, differential transformer 9 (coil with ferrite sleeve), cableguide 8 with plastic cable restrain 8.1 and grub screw 18.

First solder off the plug and pull the cable protection hose from the ca-ble guide. Then remove screw 18 and carefully pull the coil out of itsholder. Do not overheat the new coil by soldering too long, and do notcrack the ferrite sleeve which cannot stand heat. The transducer needs acomplete adjustment after transformer replacement or repairs.

At the end of this manual there is a connection diagram for the differen-tial transformer. The drawing shows the position of the soldering pins atthe coil and at the cable plug. Important: The shield must not be con-nected to the coil or to any other part of the transducer. Cut it off to-gether with the black isolation.

.

Assembly of the connector at the transducer cable: Take special care to install allsealing elements correctly.



MUBE2-e1

To fit in a new transducer ram

When the guide ram needs to be changed, its length needs to be adjust-ed. First remove the measurement ram together with the measurement tipand the ferrite core and put this unit into the new guide ram:

First remove the two grub screws, which connect the hood with the ram. Do nothold the ram by the ferrite core !

Next step after the removal of the hood is to push the measurement ramout of the guide ram.

After the protection cover was removed, push the guide ram back. Hold the neckof the measurement ram with the special pliers, possibly rest the pliers on a sup-port. The ferrite core rod and the transducer ram must not get bend.

Now insert the old measurement ram with its measurement tip and fer-rite core into the new guide ram. Them put the complete ram into thetransducer and connect it to a VMF measurement amplifier. Then meas-ure the stroke of the transducer and adjust the length of the ram by turn-ing off excess material on a lathe. Example:



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The VMF amplifier indicates +1800µm when the ram is pushed in to itslimit stop, and it measures -2100 µm when the ram is released (use a nominalsize selector). That means, the entire stroke is 3900 µm.

But a transducer must have a stroke from +2100µm to -2300 µm, i.e. overall4400 µm. In our example the difference between the actual and the nom-inal stroke is 500 µm. That means, distance A needs to be reduced by0.5 mm at the rear end of the guide ram. After that, set the ferrite core tosuch a position, that it measures + 2100µm when the transducer ram ispushed in.

To remove the ferrite core

Unscrew the small nut 29 from the top end of the ferrite core and thenpull the core together with rubber ring 31 off the ferrite core rod. Thisprocedure is only necessary if the ferrite core is going to be replaced.

The new ferrite core is put onto the rod, then the O-ring is put on andthe nut is set onto the thread but is not tightened. The nut needs to besecured with Loctite® 270. Please read the instructions on the paper whichcomes with the new ferrite core.

To install and adjust the ferrite core

The ferrite core's position in the measurement ram can be adjusted by screwingthe retaining rod further into or further out of the thread in the measure-ment ram. Before this adjustment, the adhesive in the thread must be softenedby a lighter for about 30 seconds.

The ferrite core needs to be adjusted in order to synchronize its electri-cally indicated position in the coil with the mechanical position of theram. During measurement the amplifier indicates plus and minus devia-tions from the ferrite core‘s zero (middle) position.

The ferrite core needs to be adjusted to such a position, where the trans-ducer measures plus 2100 µm if the ram is pushed in to the limit stop ofthe soft measurement spring. The measurement amplifier VMF 1000 or2000 should be adjusted to measurement range 3000µm.



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If the indication is higher or lower, take out the ram and adjust the rodof the ferrite core.

If the ferrite core rod is screwed clockwise into the measurement ram,the indicator needle will move to minus.

If the ferrite core rod is screwed anticlockwise out of the measurementram, the indicator needle moves to plus. One full turn of the ferrite corerod means an adjustment difference of 400 µm.

Do not put the adhesive on the thread of the ferrite core rod. Put a dropof adhesive in the hole of the measurement ram before screwing in theferrite core rod. This prevents the adhesive from being wiped off whilethe rod is screwed into the ram. The adhesive will remain soft long enoughto allow a proper adjustment.



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Transducer adjustment

Other than previous types, this transducer has no resistor installed in itsconnector.

The linearity range is now coarsely adjusted by means of a capacitor whichis soldered into the extension cable. The fine adjustment is done at theVMF measurement amplifier. For this, a file with linearization data (comeswith new transducer or with new set of coil/ferrite core) is transferred tothe VMF electronics.

Please do not use other cables than those which were delivered by Voll-mer with this individual gauge. Do not swap, replace or shorten cableswithout having discussed this with your Vollmer representative before.

Linearization data

Each new transducer (and each new set coil/core) comes with a diskettestoring the linearization data separate for each of the transducers. The diskettedoes also contain the Linkorr software for transferring the data from aPC into the VMF measurement electronics.

Data transfer requires measurement amplifiers VMF 1000 from version2.01 and VMF 2000 from Version 3.12. Older VMF 1000/2000 may beadapted by means of an upgrade kit.

Linkorr installation

Copy the files Linkorr.exe and supercom.dll in a directory of the PC e.g.C\Program\Linkorr.

Connect PC to VMF

Connect the COM-interface of the PCs to the interface X9 of the VMF2000 or to the interface PC of the VMF1000. Setting on the VMF2000:

E/A-Para Computer 1Baud 9600Prot —Char 8n1

LINKORR start

Double-Click on the Linkorr.exe file to startthe software. If there is no connection, an errormessage pops up.

Data transfer problems are most likely causedby a wrong cable. Please use a zero-modemcable. The VMF2000 does not use control linesfor the communication but does loop them backto the PC.



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A successfully established connection is indicated by the following win-dow:

Linearization data transfer

Linearization data need to be transferred individually for each transduc-

er from the PC into the VMF.

File / OpenThe are two types of files, indicated by their extension:*.prw generated by Optimar 100*.tkd previously transferred from a VMF 2000 to a PC

Both kinds of file have the same data structure. The *.prw file is gener-ated by an Optimar 100 and contains additional information on the transducer.

ChannelSelect channel A or B, e.g. channel A for the file Test1_A.tkd. This isimportant to ensure that the correction data are linked to the correct transducerdata input of the VMF.

Sendtransfers the selected file into the VMF.



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View

Indicates the correction tables after they were transferred into the VMF.The options Load and File / open do not update the data indicated inthe View window.

Position A: Correction point on the transducer graph. This is the uncorrect-ed value minus the correction value.

Deviation A: Correction value at this point of the probe graph. The value inbrackets is the difference between the correction data for this point andthe correction data for the previous point.

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