FMS EMGZ308 Manuale utente

Operating Manual EMGZ308

Analog Tension Measuring Amplifier

Version 2.03 04/08 st

This operation manual is also available in German.

Please contact your local representative.

Diese Bedienungsanleitung ist auch in Deutsch erhältlich.

Bitte kontaktieren Sie die Vertretung im zuständigen Land.

Operating manual EMGZ308

1 Safety Instructions

1.1 Description conditions

a) High danger of health injury or loss of life

Danger

This symbol refers to high risk for persons to get health injury or loss life. It has to be

followed strictly.

b) Risk of damage of machines

Caution

This symbol refers to informations, that, if ignored, could cause heavy mecanical damage.

This warning has to be followed absolutely.

c) Notice for proper function

Notice

This symbol refers to an important information about proper use. If not followed,

malfunction can be the result.

1.2 List of safety instructions

Proper function of the Tension Measuring Amplifier is only guaranteed with the

recommended application of the components. In case of other arrangement, heavy

malfunction can be the result. Therefore, the installation instructions on the

following pages must be followed strictly.

Local installation regulations are to preserve safety of electric equipment. They are

not taken into consideration by this operating manual. However, they have to be

followed strictly.

Improper handling may damage the fragile electronic equipment! Don’t touch the

electronic unit! Don’t use rough tools as screwdrivers or pliers! Touch earthed metal

part to discharge static electricity before touching the electronic unit!

Bad earth connection may cause electric shock to persons, malfunction of the total

system or damage of the electronic unit! It is vital to ensure that proper earth

connection is done.

Operating manual EMGZ308

Table of contents

1Safety Instructions ....................................................................................2

1.1 Description conditions 2

1.2 List of safety instructions 2

2Definitions..................................................................................................4

3System components...................................................................................4

4System description ....................................................................................5

4.1 Functional description 5

4.2 Force sensors 5

4.3 Measuring amplifier EMGZ308 5

4.4 Block diagram 6

5Dimensions.................................................................................................7

6Installation and wiring..............................................................................8

6.1 Mounting and wiring of the electronic unit 8

6.2 Mounting the force sensors 9

6.3 Wiring 9

7Setting into operation ..............................................................................10

7.1 View of the setting elements 10

7.2 Configuring gain and offset 10

7.3 Configuring the output 11

7.4 Configuring the lowpass filter 12

7.5 Calibrating the measuring amplifier 13

7.6 Scaling the integrated display 13

8Trouble shooting......................................................................................14

9Technical Data.........................................................................................15

Operating manual EMGZ308

2 Definitions

Offset:

Correction value for compensation of the zero point difference. Thanks to the offset, it is

ensured that a force of 0N will generate a signal of 0V exactly.

Gain:

Amplification factor for the measuring signal. Use of proper value will set the measuring

range of the sensor exactly corresponding to the signal output range (0...10V).

Strain gauge:

Electronic component that will change its resistance while its length has changed. Strain

gauges are used in the FMS force sensors for acquisition of the feedback value.

3 System components

The EMGZ308 consists of the following components (refer also to fig. 1):

Force sensors

• For mechanical/electrical conversion of the tension force

• Force measuring bearing (load cell)

• Force measuring roller

• Force measuring journal

• Force measuring bearing block

Measuring amplifier EMGZ308

• Hybrid module for supplying the force sensors and amplification of the mV signal

• One single electronic board may contain up to 2 hybrid modules

• Design with robust aluminium housing

• Gain and offset alternatively configurable for infinitely or fixed adjustment

• Freely configurable lowpass filter

• Freely configurable outputs (±10V; 0...20mA; 4...20mA)

• Integrated digital display

• Supports connection of an external feedback display

(Italic components as variant or option)

Operating manual EMGZ308

4 System description

fig. 1: Basic structure of the EMGZ308 Tension Measuring Amplifier (picture shows

single channel version) E308001e

4.1 Functional description

The force sensors measure the tension force in the processed material and transmit the

measuring value as a mV signal to the hybrid module in the measuring amplifier

EMGZ308. The measuring amplifier amplifies the mV signal depending on configuration.

The resulting feedback value can be transmitted to an analog instrument, a PLC or

equivalent devices. In addition, the force value is shown in the integrated digital display.

4.2 Force sensors

The force sensors are based on the flexion beam principle. The flexion is measured by

strain gauges and transmitted to the measuring amplifier as mV signal. Due to the

wheatstone wiring of the strain gauges, the measured value is according also to the power

supply. So, the force sensors are supplied from the EMGZ308 by a very accurate power

supply.

4.3 Measuring amplifier EMGZ308

The EMGZ308 is a single or double channel analog Tension Measuring Amplifier based

on a hybrid circuit per channel. It is delivered in a robust aluminium housing. All

connections are led through glands to screw terminals. There can be connected 1 or 2

force sensors of 350Ωto each channel. The hybrid modules provide the highly accurate

5V power supply and amplify the mV signals of the force sensors to a level of 10V and

20mA. Tension and current output are active the same time. The hybrid technology

ensures both good thermal and electrical characteristics. Measuring circuit and power

supply are galvanic insulated.

Setting of gain and offset is done by 2 trimmers. For filtering of the signals, non-

polarized capacitors can be soldered.

Infinite adjustment of gain and offset

Setting by trimmers is used to get a standardized output signal (i.e. 10V) from any kind of

sensor signal. This ensures accurate amplifying of the signal and maximum immunity to

any interference of the signal cable.

Operating manual EMGZ308

Fixed setting of gain and offset

Fixed setting is used when maximum thermal stability and vibration-proof conditions are

needed. The signal is pre-amplified with a fixed value and has to be evaluated digitally

(for ex. by a PLC), so that offset and gain can be calculated.

4.4 Block diagram

fig. 2: The block diagram shows the single channel version. E308002e

Operating manual EMGZ308

5 Dimensions

8 x M16 x 1.5

EMGZ308 SERIES

CHANNEL 1

CHANNEL 2

fig. 3 E308013e

Operating manual EMGZ308

6 Installation and wiring

Caution

Proper function of the Tension Measuring Amplifier is only guaranteed with the

recommended application of the components. In case of other arrangement, heavy

malfunction can be the result. Therefore, the installation instructions on the following

pages must be followed strictly.

Caution

Local installation regulations are to preserve safety of electric equipment. They are not

taken into consideration by this operating manual. However, they have to be followed

strictly.

Caution

Improper handling may damage the fragile electronic equipment! Don’t touch the

electronic unit! Don’t use rough tools as screwdrivers or pliers! Touch earthed metal part

to discharge static electricity before touching the electronic unit!

6.1 Mounting and wiring of the electronic unit

The aluminium housing of the measuring amplifier may be mounted to any place in the

machine, but usefully a position close to the force sensors is chosen. Wiring to the

terminals is done according to wiring diagram (fig. 5).

fig. 4: Screw terminal arrangement on the electronic pc board E308009e

Operating manual EMGZ308

6.2 Mounting the force sensors

Mounting of the force sensors is done referring to the FMS Installation manual which is

delivered together with the force sensors.

Wiring to the terminals of the electronic unit is done according to wiring diagram (fig. 5).

Notice

Connecting the shield of the signal cable to the electronic unit and to the force sensor

may cause ground circuits which may interfere the measuring signal massively.

Malfunction can be the result. The shield should be connected only to the electronic unit.

On the „force sensor“ side, the shield should stay open.

6.3 Wiring

fig. 5: Wiring diagram E308007e

There can be connected 1 or 2 force sensors per channel. Using 2 force sensors, the

connections will be wired parallel. The output signal of the measuring amplifier then will

correspond to the average value of the 2 sensors.

The connection between force sensors and measuring amplifier has to be done using

2x2x0.75mm2[AWG 18] shielded twisted-pair cable. (With cable length below 15m,

2x2x0.25 mm2[AWG 23] is also suitable.) The cable must be installed separate from

power lines.

Caution

Bad earth connection may cause electric shock to persons, malfunction of the total system

or damage of the electronic unit! It is vital to ensure that proper earth connection is done.

Operating manual EMGZ308

7 Setting into operation

7.1 View of the setting elements

fig. 6: Setting elements E308008e

7.2 Configuring gain and offset

Gain and offset are configured by jumpers. The settings can be made individually for

each channel.

Gain and offset with infinite setting

If gain and offset are adjusted with the

trimmers, the jumpers have to be set

according to fig. 7. Gain and offset then

may be adjusted using the trimmers (refer

to „7.5 Calibrating the measuring

amplifier“).

fig. 7: Jumper setting for infinite gain

and offset adjustment E308010a

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