FMS EMGZ473 User manual

Operation Manual EMGZ473/474
Digital microprocessor controlled Tension Measuring
Amplifier with integrated PROFIBUS®interface
Operation Manual Version 2.03 02/03 ff
Firmware Version 1.04 02/03
GSD Version 1.03 05/02
This operating manual is also available in German.
Please contact your local representative.
Diese Bedienungsanleitung ist auch in Deutsch erhältlich.
Bitte kontaktieren Sie Ihren nächstgelegenen FMS Vertreter.
© by FMS Force Measuring Systems AG, CH-8154 Oberglatt – All rights reserved.

Operating Manual EMGZ473/474
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1Safety Instructions
1.1 Description Conditions
a) 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.
When putting the housing cover to the bottom you must ensure that the D-Sub
connection in both bottom and cover is in the right position. The cover can only
be mounted in the right position! If the cover is mounted forcibly the electronic
unit may be damaged!
Bad earth connection may cause electric shock to persons, malfunction of the total
system or damage of the measuring amplifier! It is vital to ensure that proper earth
connection is done.
Improper handling may damage the fragile electronic equipment! Don’t use rough
tools such as screwdrivers or pliers! Touch earthed metal part to discharge static
electricity before touching the electronic unit!

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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 Sensor 5
4.3 Electronic Unit EMGZ473/474 5
4.4 Block Diagram 6
5Quick Installation Guide..........................................................................7
6Dimensions.................................................................................................8
6.1 Dimensions EMGZ473 8
6.2 Dimensions EMGZ474 8
7Installation and Wiring ............................................................................9
7.1 Mounting the Measuring Amplifier 9
7.2 Mounting the Force Sensors 9
7.3 Setting Elements on the Electronic Unit 10
7.4 Wiring Diagram EMGZ473 11
7.5 Wiring Diagram EMGZ474 11
7.6 Wiring of Power Supply and PROFIBUS Data Cable 12
7.7 Setting the PROFIBUS Address 13
8PROFIBUS Interface Description.........................................................14
8.1 GSD File 14
8.2 EMGZ473/474 DP Slave Functional Description 14
8.3 Initial Parameters 14
8.4 Configuration 15
8.5 Process Data 16
9Calibrating the Measuring Amplifier ...................................................18
9.1 Simulating Method, Calibration within the PLC 18
9.2 Simulating Method, Calibration using Initial Parameters 19
9.3 Simulating Method, Calibration using Control Byte 19
9.4 Mathematical method (Module 1 only) 20
9.5 Configuring the Lowpass Filter 21
10 Trouble Shooting.....................................................................................22
11 Technical Data.........................................................................................23

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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.
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.
3System Components
The EMGZ473/474 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
Electronic unit EMGZ473/474
•For supplying 1 or 2 force sensors and amplifying the mV signal
•With intergrated PROFIBUS interface for operation and parametrization
•Operates as PROFIBUS DP slave according to EN 50170
•For wall mounting, set off of the force sensor (EMGZ473)
•For control cabinet mounting (EMGZ474)
PROFIBUS master computer
•For operation of the electronic unit EMGZ473/474
•Operates as PROFIBUS DP master according to EN 50170
•Any master computer or PLC suitable
(Italic text indicates a variant or option)

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4System Description
fig. 1: Basic structure of the EMGZ473 Tension Measuring Amplifier E473001e
4.1 Functional Description
The force sensor measures the tension force in the material and transmits the
measuring value as a mV signal to the electronic unit. The electronic unit amplifies the
mV signal depending on configuration. The resulting feedback value can be read by
the PROFIBUS master. The application specific calculations will be done by the
PROFIBUS master.
4.2 Force Sensor
The force sensors are based on the flexion beam principle. The flexion is measured by
strain gauges and transmitted to the electronic unit 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 electronic unit by a very
accurate power supply.
4.3 Electronic Unit EMGZ473/474
Common
The electronic unit contains a microprocessor to handle all calculations and
communications, the highly accurate sensor power supply and the signal amplifier for
the measuring value. In addition, a PROFIBUS interface is integrated to the electronic
unit. The electronic unit can process the signals of two force sensors (sum signal).
EMGZ473: The EMGZ473 is built into a compact aluminium housing according to
IP67. The cover has an electrical function identical to the PROFIBUS standard plug
(connection of the cables and termination). This allows to disconnect the measuring
amplifier from PROFIBUS without cutting the bus line.
EMGZ474: With control cabinet mounting, the EMGZ474 can be used. Connection is
done with the PROFIBUS D-Sub-9 standard plug. This design is less robust against
environmental influences (protection class IP00).

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Strain gauge amplifier
The strain gauge amplifier provides the highly accurate 4V power supply. A highly
accurate, fixed difference amplifier rises the mV signal up to 10V. This signal will be
fed to the A/D converter. The microprocessor then calculates a standardized signal
from the digitized measuring value, which is fed to the PROFIBUS interface.
PROFIBUS interface
The EMGZ473/474 operates as PROFIBUS DP slave according to EN 50170. All
settings and the entire communication is done by the integrated PROFIBUS interface.
4.4 Block Diagram
fig. 2: block diagram EMGZ473 E473005e

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5Quick Installation Guide
•Check all your requirements such as: configuration of the PROFIBUS interface
(address number, data format, required PROFIBUS cycle time, termination, etc),
calibration mode (ref. to „9. Calibrating the measuring amplifier“)?
•Draw your final wiring diagram according to the wiring diagram (refer to „7.4
Wiring diagram EMGZ473“ / „7.5 Wiring diagram EMGZ474“)
•Install and wire all your components (refer to „7. Installation and wiring“)
•Make settings in the PROFIBUS master computer (DP master) (ref. to
„8. PROFIBUS Interface Description“)
•Set measuring amplifier into operation and calibrize it by PROFIBUS (refer to
„9. Calibrating the measuring amplifier“)
•Turn system on; proceed a test run with low speed
•If required, activate additional application-specific functions of the PROFIBUS
master computer (DP master)
Note
If a real-time control loop is implemented with the PROFIBUS, it has to be ensured
that the application-specific PROFIBUS protocol is timewise short enough to
provide sufficient control dynamics.

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6Dimensions
6.1 Dimensions EMGZ473
fig. 3 Outline drawing EMGZ473 E473003us
6.2 Dimensions EMGZ474
fig. 4 Outline drawing EMGZ474 E474001us

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7Installation 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
When putting the housing cover to the bottom you must ensure that the D-Sub
connection in both bottom and cover is in the right position. The cover can only be
mounted in the right position! If the cover is mounted forcibly the electronic unit may
be damaged!
7.1 Mounting the Measuring Amplifier
EMGZ473: The housing with the measuring amplifier is mounted to the machine
frame close to the force sensor.
EMGZ474: The measuring amplifier is snapped on a DIN mounting rail in a control
cabinet.
7.2 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 of the force sensor cables to the terminals is
done according to the wiring diagram (fig. 6 and 7). This means all analogue wiring is done.
Note
If the wiring to the force sensor is modified by the customer: Connecting the shield of
the signal cable to the measuring amplifier 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 measuring amplifier. On the „force
sensor side“, the shield should stay open.

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7.3 Setting Elements on the Electronic Unit
fig. 5: Setting elements on the electronic unit E473010e