FMS EMGZ300 User manual

Operating Manual EMGZ300
Analog multi channel Tension Measuring Amplifier
Version 2.03 04/02 fg
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 die Vertretung im zuständigen Land.
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 italiano, francese e tedesco.
Vogliate cortesemente contattare la locale rappresentanza.
© by FMS Force Measuring Systems AG, CH-8154 Oberglatt – All rights reserved.

Operating manual EMGZ300
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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 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.
Improper mounting may damage the hybride module! The black mark on the hybride
module must match to the edge shown on the printed circuit board. Avoid static
electricity!
The thin ceramic plate of the hybride module is very sensitive. Breaking hazard! Avoid
high forces while mounting! Do not unmount modules once fitted!

Operating manual EMGZ300
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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 sensors 5
4.3 Electronic unit EMGZ300 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 Configuring gain and offset 10
7.3 Configuring the outputs 11
7.4 Configuring the lowpass filter 11
7.5 Calibrating the measuring amplifier 12
8Upgrade with additional channels.........................................................13
9Trouble shooting......................................................................................14
10 Technical Data.........................................................................................14

Operating manual EMGZ300
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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 (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.
3System components
The EMGZ300 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 EMGZ300
•Hybrid module for supplying the force sensors and amplification of the mV signal
•One single electronic board may contain up to 4 hybrid modules
•Variable or fixed values for gain and offset
•Freely configurable lowpass filter
•Freely configurable outputs (±10V; 0...20mA; 4...20mA)
•For mounting into insert card support block EMGZ555959 (by mounting into control
cabinet)
•With aluminium front panel for mounting into 19“ rack
•Supports connection of an external feedback display
(Italic components as variant or option)

Operating manual EMGZ300
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4System Description
fig. 1: Basic structure of the EMGZ300 Tension Measuring Amplifier (picture shows
single channel version) E300001e
4.1 Functional description
The force sensors measure the tension force in the material and transmit the measuring value
as a mV signal to the hybrid module in the electronic unit EMGZ300. The electronic unit
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 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 EMGZ300 by a very accurate power supply.
4.3 Electronic unit EMGZ300
The EMGZ300 is an analog Tension Measuring Amplifier with 1 to 4 channels. Each channel
consists of a separate hybrid module which can be connected to 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 by 2 trimmers and 4 jumpers for each channel. Each channel can be set
independent of the other channels. Offset and gain are set using the trimmers. For filtering of
the signals, a non-polarized capacitor can be soldered.
The jumpers enables also to operate the amplifier with fixed gain and offset. This will provide
better thermal stability. But the signal then has to be processed digitally (for ex. by a PLC), so
that offset and gain can be calculated.

Operating manual EMGZ300
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4.4 Block Diagram
fig. 2 E300002e

Operating manual EMGZ300
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5Dimensions
fig. 3: Dimensions. The insert card support block EMGZ555959 has to be ordered
separately. The aluminium front panel is optional. E300003us
If the electronic unit should be mounted into a 19“ rack, the electronic unit has to be ordered
with aluminium front panel (EMGZ300-x channel.581748). Instead of the support block, a
multipoint plug can be used.

Operating manual EMGZ300
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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 insert card support block can be mounted in a control cabinet. Wiring to the terminals is
done according to wiring diagram (fig. 4). The electronic card then will be inserted into the
insert block. It will be locked by a stop hook (fig. 3).
Caution
Improper handling may damage the fragile electronic equipment! Don’t use rough tools as
screwdrivers or pliers! Touch earthed metal part to discharge static electricity before touching
the electronic unit!
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).
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.

Operating manual EMGZ300
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6.3 Wiring
fig. 4: Wiring diagram E300004e
There can be connected 1 or 2 force sensors to each channel. Using 2 force sensors in
1 channel, the connection cables 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.
The terminals 10d and 10z have to be connected to earth.
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 EMGZ300
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7Setting into operation
7.1 View of the setting elements
fig. 5: Setting elements for all channels E300005e
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 variable
If gain and offset will be adjusted on the
electronic unit, the jumpers will be set to
„variable“ (fig. 6). Gain and offset then may
be adjusted using the trimmers (refer to „7.5
Calibration of the measuring amplifier“).
Gain and offset fixed
If the signal is processed by a control unit (for
ex. a PLC), configuration with fixed gain and
offset is recommended (offset = 0; gain =
1111). Therefore, the jumpers will be set to
„fixed“ (fig. 7). This configuration takes the
highest advantage of the good thermal
characteristics of the hybrid module. The
output signal will be 10V resp. 20mA when
nominal force of the sensor is applied.
fig. 6: Jumper setting for variable gain
and offset E300006a
fig. 7: Jumper setting for fixed gain
and offset E300006b