FMS EMGZ300, Руководство по эксплуатации

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Operating manual EMGZ300
5
4 System 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 350
Ω
.
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.