Cleveland Motion Controls Classic Series DIN Rail Amplifier Non-Isolated MWI-13466 REV CA - Manual (Page 5)

MAN-13466 R EV CA C LASSIC S ERIES N ON -I SOLATED A MPLIFIER
P AGE 5 OF 26
1 P RODUCT O VERVIEW
1.1 G ENERAL D ESCRIPTION
The Classic Series DIN Rail amplifier (non-isolated) provides a complete signal conditioning solution for
amplifying and reporting signals from a pair of strain-gage-based load cells. Either semiconductor or foil-based load
cells can be used. Note that the non-isolated version of the Classic Series DIN Rail amplifier shares the same
ground reference (common) between the 24VDC supply, output signals, and strain-gage bridge.
The Classic Series DIN Rail amplifier uses an Instrumentation Amplifier (IA) to amplify the signal from a pair of
half-bridge transducers. The IA stage amplifies the millivolt level signals generated by the load cells, while
effectively rejecting common-mode noise. A wide range of switch selectable gains can be used to provide the most
appropriate level of initial amplification. Low drift Surface Mount Technology (SMT) components, Multi-layer
Printed Circuit Boards (PCB) and optimum circuit topologies are incorporated to promote load cell signal integrity.
A variable gain stage further amplifies the output of the instrumentation amplifier. The gain of this stage is
adjustable over a 10:1 range to allow span calibration of the analog outputs.
A precision voltage source is provided for exciting the strain gage elements in the inter-connected load cells (tension
transducers). The circuit includes a short circuit current limit feature to protect the amplifier in the event of mis-
wiring. Output voltage is selectable to either of the following:
• 5.0 VDC
• 10.0 VDC
The final analog tension signal is available in a variety of forms. The un-damped output signal is provided from a
+/-10V analog buffer stage.
A damped (low pass filtered) version of the tension signal is available for driving displays or recording devices. The
damping is switch selectable for a cutoff frequency of either 0.3 Hz or 3.7 Hz. Damping is useful for improving the
readability, effectively masking higher frequency fluctuations superimposed on the tension signal. This damped
output stage can be configured to be either:
• +/- 2V analog output - intended primarily for driving Digital Panel Meters (DPM).
• +/-1 mA current source - When configured as the current source, the 1 mA output is
typically used to drive D’Arsonval style analog meters.
1.1.1 CE EMC R ESPONSIBILITY
Cleveland Motion Controls DIN Rail Amplifier MWI-13466 Classic Series module can be considered a component
performing a direct function and therefore is subject to the provisions of the EMC Directive.
The Cleveland Motion Controls DIN Rail Amplifier MWI-13466 module may be used by a manufacturer as a
component of a larger system, along with other components, which may or may not bear the CE mark. The system
assembler is responsible for the compliance of the system as a whole with the EMC Directive.
To assist manufacturers, suppliers, and installers of relevant apparatus, the Cleveland Motion Controls DIN Rail
Amplifier MWI-13466 module is compliant to EN61326:1997 when installed according to these instructions.
Manufacturers, suppliers, and installers of relevant apparatus may use this compliance as a contributing basis for
their own justification of overall compliance with the EMC Directive.
Before installing the Classic Series DIN Rail Amplifier you must clearly understand who is legally responsible for
conformance with the EMC Directive. Misappropriation of the CE mark is a criminal offense.