Operating Manual EMGZ480
7
4.2
Force Sensor
The force measuring sensors base on the flexion or dual flexion beam principle. The
flexion in the sensor body is measured by strain gauges as a mV signal. In order to
minimize the power supply influence to the strain gauges Wheatstone Bridge and achieve
a clean and accurate amplification, the force sensors are supplied with a very stable,
controlled supply voltage.
4.3
Electronic Unit EMGZ480, EMGZ480.M16
General Information
A microprocessor in the electronic unit handles all calculation and communication tasks.
The electronic unit contains a signal amplifier with a highly accurate sensor power supply
section. The integrated CAN-BUS interface block handles the CAN-Bus protocol.
EMGZ480 and EMGZ480.M16 can process the signals of two force sensors (sum signal).
Strain Gauge Amplifier
The strain gauge amplifier section provides the highly accurate 5V DC supply voltage for
one or two force measuring sensors. A highly accurate, fixed difference amplifier raises
the mV signal to the Volt-range (up to10V). This signal is fed to 14-Bit A/D converter.
The microprocessor conditions the signal and calculates all application specific
parameters like Offset, Gain, Filter and Limit values. The digitalised signal can then be
read by the CAN-BUS master.
CAN-BUS Interface
The EMGZ480 and EMGZ480.M16 operate the CAN Open / CiA-DS 301 interface. The
interface is galvanically isolated.
Operation
The entire parameter setting is done over the CAN-BUS. Parameters and settings are
stored in a none-volatile memory, completely fail-save
Fig. 3: Block Diagram EMGZ480
E480005e