FMS EMGZ307 User manual

Operating Manual EMGZ307
Analogue Tension Measuring Amplifier
Version 1.1 10/2009 ff
This operation manual is also available in German, French and Italian.
Please contact your local representative.
Diese Bedienungsanleitung ist auch in Deutsch, Französisch und Italienisch erhältlich.
Bitte kontaktieren Sie Ihren nächstgelegenen FMS Vertreter.
Ce mode d'emploi est également disponible en Français, en Italien et en Allemand.
Veuillez contacter la représentation locale.
Queste manuale d’installazione è disponibile anche in lingua italiana, francese e tedesco.
Vogliate cortesemente contattare la locale rappresentanza.
© by FMS Force Measuring Systems AG, CH-8154 Oberglatt – All rights reserved.

Operating manual EMGZ307
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1Safety 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) Note for proper function
Note
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.

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Table of Contents
1Safety Instructions ....................................................................................2
1.1 Description conditions 2
1.2 List of safety instructions 2
2Definitions..................................................................................................3
3System components...................................................................................4
3.1 Different EMGZ307 Variants 4
4System Description....................................................................................5
4.1 Functional description 5
4.2 Force sensors 5
4.3 Measuring amplifier EMGZ307 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 8
6.3 Wiring 9
7Setting into Operation.............................................................................10
7.1 View of the Setting Elements 10
7.2 Settings for EMGZ307.582388 10
7.3 Configuring Gain and Offset 11
7.4 Configuring the Outputs 12
7.5 Configuring the Lowpass Filters 13
7.6 Calibrating the Measuring Amplifier 14
8Trouble shooting......................................................................................15
9Technical Specification...........................................................................15
2Definitions
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 changes its resistance when its length changes. Strain
gauges are used in the FMS force sensors for acquisition of the feedback value.

Operating manual EMGZ307
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3System Components
The EMGZ307 consists of the following components (refer also to fig. 1):
Force sensors
•For mechanical/electrical conversion of the tension force
•Force measuring bearing
•Force measuring roller
•Force measuring journal
•Force measuring bearing block
Measuring amplifier EMGZ307
•Hybrid module for supplying the force sensors and amplification of the mV signal
•Robust design with compact aluminium housing (IP67)
•Gain and offset alternatively configurable for infinitely or fixed adjustment
•Freely configurable lowpass filter
•Freely configurable outputs (±10V; 0...20mA; 4...20mA)
•Supports connection of an external feedback display
(Components in italic letters indicate a variant or option)
3.1 Different EMGZ307 Variants
The tension measuring amplifier EMGZ307 is available in two variants:
EMGZ307: Standard 1-channel analogue amplifier
EMGZ307.582388: 1-channel analogue amplifier for rotating applications.
Electronics board is covered with moulding compound to
secure the components and provide protection from centrifugal
forces.
Note
This manual describes the possible setting of the standard amplifier EMGZ307. Some
options, however, are not available in the EMGZ307.582388. For more details refer to
chapter 7 “Setting into Operation”.

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4System Description
fig. 1: Basic structure of the EMGZ307 Tension Measuring Amplifier E307001e
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
EMGZ307. 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.
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 EMGZ307 by a very
accurate power supply.
4.3 Measuring Amplifier EMGZ307
The EMGZ307 is a single channel analog Tension Measuring Amplifier based on a
hybrid circuit. It is developed specially for use under hard conditions. It is delivered in
a sealed housing compliant with IP67. There can be connected 1 or 2 force sensors of
350Ω. The hybrid module provides the highly accurate 5V power supply and amplifies
the mV signal 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.
All settings are done alternatively by 2 trimmers or fixed by jumpers. For filtering of
the signals, non-polarized capacitors can be soldered.

Operating manual EMGZ307
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Infinite adjustment of gain and offset
Setting by trimmers is used to get a standardized output signal (for ex. 10V) from any
kind of sensor signal. This ensures accurate amplifying of the signal and maximum
immunity to any interference of the signal cable.
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 (i.e. by PLC), so that offset and gain can be calculated.
4.4 Block Diagram
fig. 2: Block diagram E307002e

Operating manual EMGZ307
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5Dimensions
fig. 3: Outline drawing EMGZ307 E307003us

Operating manual EMGZ307
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6Installation 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.
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. 4).
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.
4).
Note
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.

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6.3 Wiring
fig. 4: Wiring diagram E307004e
There can be connected 1 or 2 force sensors to the measuring amplifier. Using 2 force
sensors, the connections are internally 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
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!
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.
Note
The housing complies with IP67 only if no cable bushing stays open. Therefore, not
needed PG glands have to be closed.

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7Setting into Operation
7.1 View of the Setting Elements
fig. 5: Wire terminals, switches EMGZ307 E307005e
7.2 Settings for EMGZ307.582388
The special type EMGZ307.582338 for rotating applications has different setting
options as the standard EMGZ307.
For the EMGZ307.582338 following differences exist:
•The offset is preset to “offset fix” see fig.7
•The gain is preset to “gain fix” = 1111 see fig. 7.
•The output current signal is preset to “4..20mA”, see fig. 9
•The electronics board of the amplifier is protected with moulding compound
•The unit is pre-assembled with cables of 8m length.
The wiring of the pre-assembled cables is described in the table below:
Cable Type Terminal Colour Signal Name
Force sensor, 4 wire cable 1 yellow +5V excitation
2 white +signal
3 brown -signal
4 green -5V excitation
Power supply, 2 wire cable 1 brown +24V
2 blue GND
Signal, 3 wire cable 1 brown 0-10V
2 black or
yellow/green GND
3 blue 4-20mA