DFE RFA Manuale utente

INSTRUCTION MANUAL

Ribbon-Filament Transducer

Model RFA

DOC 801-0784 R4

Dover Flexo Electronics

307 Pickering Road

Rochester, NH 03867- 4630

U.S.A.

FOR ASSISTANCE:

TECHNICAL SERVICE - Installations, Start-Up, Troubleshooting, Repairs, Field Service

or Returns. Call (603) 332-6150 and ask for Technical

Support or email us at: [email protected]

CUSTOMER SERVICE - Replacement Parts, Individual Products, Questions about

Orders, Manuals. Call (603) 332-6150 and ask for Customer

Service or email us at: cust[email protected]

SALES - Product Information, System Application Questions or Placing

Orders, Please e-mail us at: [email protected] or call

(603) 332-6150 and ask for Sales.

Telephone: (603) 332-6150 Fax: (603) 332-3758

E-mail: [email protected] Internet: www.dfe.com

this document. However, NO WARRANTY, whether expressed or implied, is given regarding the completeness or correctness of

information in this document. Dover Flexo Electronics shall not be liable for damages of any kind arising from the use or misuse of

this document. Dover Flexo Electronics reserves the right to make changes, additions, and deletions to this document without notice

and without obligation.

This label indicates: “Read The Manual”

Make sure you read and understand all instructions and safety precautions listed in this manual

before installing or operating your Model RFA Tension Transducer. If you have any questions

concerning the operation of your device or the information in this manual, please contact us.

Email: [email protected]

Telephone: (603) 332-6150

•Observe all warning labels.

•Never remove warning labels.

WARNING: During installation care should be taken not to drop the Model RFA

transducer, handle the unit with care, sudden jolts or drops can damage its components

and serious injury could result.

WARNING: If this equipment is not connected or operated in the manner specified, the

operating safety of this unit or of connected equipment cannot be guaranteed.

WARNING: Do not connect a standard excitation (5V) tension transducer to a DFE

amplifier with the Extended Range (XRE) option enabled (10V), the transducer may be

damaged.

Table of Contents

DOCUMENT CONVENTIONS ................................................................................................... 5

1GENERAL DESCRIPTION ................................................................................................. 6

1.1 CONSTRUCTION AND MECHANICAL OPERATION (see Figure 1)........................... 6

1.2 SPECIFICATIONS....................................................................................................... 7

1.3 STANDARD FEATURES ............................................................................................. 7

1.4 CONFIGURATION CHOICES...................................................................................... 7

1.5 OPTIONS .................................................................................................................... 8

2INSTALLATION.................................................................................................................. 9

2.1 DIMENSIONS .............................................................................................................. 9

2.2 PRE-INSTALLATION REQUIREMENTS ....................................................................10

2.3 INSTALLATION ..........................................................................................................11

2.4 ELECTRICAL OPERATION........................................................................................12

3CALIBRATION AND SETUP.............................................................................................13

3.1 INTRODUCTION ........................................................................................................13

3.2 ZERO THE TENSION METER....................................................................................13

3.3 CALIBRATE THE TENSION METER..........................................................................13

4CARE AND MAINTENANCE.............................................................................................14

4.1 BEARING LIFE ...........................................................................................................14

4.2 DISASSEMBLY AND REASSEMBLY - TOOLS REQUIRED ......................................14

4.3 CHANGING THE BEARING(S) AND/OR WHEEL.......................................................14

5TROUBLESHOOTING.......................................................................................................15

APPENDIX A: SELECTION OF LOAD RATING ......................................................................17

APPENDIX B: TYPICAL TENSIONS FOR VARIOUS MATERIALS.........................................19

TERMS AND CONDITIONS OF SALE AND SHIPMENT .........................................................20

DOCUMENT CONVENTIONS

NOTES - Highlight important concepts, decisions you must make, or the implications of those

decisions.

CAUTIONS - Tell you when equipment may be damaged if the procedure is not followed

properly.

WARNINGS - Tell you when people may be injured, or equipment may be damaged if the

procedure is not followed properly.

Numbered lists indicate tasks that should be carried out in sequence:

1. First do this

2. Then do this

1 GENERAL DESCRIPTION

The Model RFA “Ribbon-Filament” Tension Transducer is an electro-mechanical device that converts ribbon,

web, or filament tension into a DC voltage proportional to tension. The voltage is amplified in external electronic

circuitry such as a DFE Tension Amplifier, Indicator or Closed-Loop Controller which is calibrated to output and/or

display actual tension. The tension reading is expressed in pounds, ounces, grams, kilograms, newtons, or any

other desirable units. It can also be supplied to a regulator circuit to control tension automatically.

The RFA Tension Transducer is typically used in applications where the machine has only one side frame and

the idler wheels are cantilevered. The information in this section will help give a clear understanding of the RFA

Tension Transducer system - how it works and how it’s used.

1.1 CONSTRUCTION AND MECHANICAL OPERATION (SEE FIGURE 1)

The standard RFA Transducer wheels are manufactured of aluminum to be lightweight and of low inertia,

and the ribbon wheels and filament wheels are given a hard coat anodized surface finish to be durable.

The bearings are standard deep-groove ball type with shields to discourage entry of contaminants.

Custom wheel geometries and/or finishes are available including those made by the customer to be

mounted on the adapter wheel, subject to specific DFE engineering approval.

Inside the transducer is a single beam having two parallel cantilevered webs with strain gages mounted

on each. When tension is applied, the beam deflects a small amount, causing an electrical output from

the strain gages which is directly proportional to the filament tension.

The bore of the housing acts as a mechanical stop, preventing damage to the beam and gages from

accidental overloads. The stop is functional through 360 degrees, so the overload condition may occur

from any direction, not just the load direction. In all cases, the beam is prevented from deflecting far

enough to cause any damage.

Figure 1 - CUT-AWAY VIEW OF RFA TRANSDUCER

1.2 SPECIFICATIONS

ELECTRICAL SPECIFICATIONS

Excitation Voltage: 5 VDC max (Std), 10 VDC max (XR Option)

Output: 100 mV/V, nominal

Strain Gages: Semiconductor, 100 ohms nominal resistance

Repeatability: +/- 1/4% FS

Linearity and Hysteresis Combined: +/- 1/2% FS

Temperature Range: -10° F to +200° F (-23° C to +93° C)

Temperature Coefficient: 0.02% per degree F, typical (0.01% per degree C, typical)

Electrical Connector: MIL Spec - PT02E10-6P

Electrical Connections:

Pin A (White): Signal Output (-)

Pin B (Black): Excitation (+)

Pin C (Red):Excitation (-)

Pin D (Green):Signal Output (+)

Pin E (Blue): Excitation (-)

Pin F (Brown): Excitation (+)

Mating Electrical Connector:

MIL Spec (Standard) - 6 socket, female, PT06E10-6S

MECHANICAL SPECIFICATIONS

Materials: 303 stainless steel and 7075-T6 aluminum, black anodized hard coat wheel finish.

Maximum Overload Capacity: Four times the load rating.

Deflection: .005" typical (0.127 mm typical)

Standard Connector Position:

S, FL styles - 6 o'clock

PB style - Rear with reference to force direction

Load Ratings: 10, 25, 50, 100, 150 (45, 111, 222, 445, 670 N)

Note: The information below is only applicable if a DFE Wheel or shaft assembly is used.

Break-Away Torque: 0.25 in-oz (18 gram-cm) typical

Basic Dynamic Load Rating of Bearings: 4300 lbs (19120 N)

Wheel Weights:

Filament 0.49 lbs (222 g)

Ribbon 0.45 lbs (204 g)

Adapter 0.65 lbs (295 g)

1.3 STANDARD FEATURES

Dual Cantilever Beam: Provides high strength and accuracy at low tension.

Stainless Steel and Aluminum Construction: Excellent durability and corrosion resistance.

Compact Size: For easy mounting--even in small spaces.

1.4 CONFIGURATION CHOICES

These are explanations of standard choices of various configurations that were specified for your

application.

Mounting Styles: Screw or Bolt mount (S) uses a single bolt to mount to machine frame. Pillow Block

bracket (PB) uses a right-angle bracket to mount onto the machine frame. Flange mount (FL) uses a

four-bolt flange mounted onto the machine frame which can be rotated to any position for precise

orientation.

Load Ratings:10, 25, 50, 100, 150 lbs (45, 111, 222, 445, 670 N)

DFE Wheel Types: Ribbon Wheel (specify width of 1 to 4 inches), Filament Wheel, Adapter Wheel (hub

for custom applications).

Connector Positions:

S, FL: 1:30, 3:00, 4:30, 6:00 (std.), 7:30, 9:00, 10:30, 12:00.

PB: Rear (std.), 1:30, 3:00, 9:00, 10:30, 12:00 with reference to force direction.

1.5 OPTIONS

Extended Range (XR): Accepts 10V excitation from a supported amplifier, indicator, or controller with

(XRE) option.

Metric Mounting Screw (MMS): Metric mounting thread for S type transducers.

2 INSTALLATION

2.1 DIMENSIONS

Figure 2 – DIMENSIONS

2.2 PRE-INSTALLATION REQUIREMENTS

Note: No brakes, clutches, belts, chains, or gears should be attached to the transducer

wheel. It cannot be a nip roll or be in contact with a nip wheel. Nothing must contact the wheel except

the ribbon or filament.

1. TENSION ZONE

The transducer must be located in the tension zone which is to be monitored or controlled. The

beginning or end of any tension zone is always at a nip (driven or braked), unwind shaft, rewind

shaft, or drag bar. Any element in the filament path that can change tension is at one end of a tension

zone.

Figure 3- TENSION ZONES

2. WRAP ANGLE

The web or filament must always contact the transducer wheel in the same way. The wrap angle

must not change as the unwind or rewind reel diameter changes. Therefore, there must be at least

one idler wheel between the transducer and the unwind or rewind shaft. If the machine has more

than one web path, be sure to choose a location that is wrapped the same for each. Otherwise, it will

be necessary to install an additional idler roll or transducer, or dual calibration circuitry, or all three. If

the wrap angle is allowed to change, the transducer output will change with angle as well as tension,

and accuracy will be reduced.

3. MOUNTING SURFACE

The structure on which the transducers are mounted must be very stable and strong. Any

movement of the structure may be sensed by the transducers and may cause inaccurate tension

readings. The surfaces must also be smooth and flat so the transducers can be properly aligned

during installation. The RFA Transducer is sold in three different mounting styles and attached to the

machine frame by one of three methods: A single bolt (S) through the back of the unit, a four-bolt

flange (FL), or a pillow-block type bracket (PB).

Figure 4 – RFA MOUNTING STYLES

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