Cleveland Motion Controls DIN Rail Amplifier MWI-13262 Ultra Series Non-Isolated REV BA User Manual

Page 5

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MAN-13262

R

EV

BA

DIN

R

AIL

A

MPLIFIER

,

MWI-13262

U

LTRA

1 P

RODUCT

O

VERVIEW

1.1 G

ENERAL

D

ESCRIPTION

The Ultra 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 Ultra Series DIN Rail amplifier shares the same ground reference
(common) between the 24VDC supply, output signals, and strain-gage bridge.

The Ultra Series DIN Rail amplifier uses a dedicated Instrumentation Amplifier (IA) for each transducer channel.
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 summing amplifier stage combines the left and right IA channels. The gain of this stage is adjustable over a 10:1
range to allow span calibration of the analog outputs. To improve rejection of “out of band” signals, the summing
stage is followed by a DC accurate 2-pole active filter.

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 can be provided
from a +/-10V analog buffer stage, as well as a standard 4-20 mA current loop stage. The voltage supply for the
current loop bias is internally provided. The current loop scaling has been specially designed so that minor negative
excursions of the tension signal can continue to be reported as currents below 4 mA.

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-13262 Ultra 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-13262 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-13262 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 Ultra 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.

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