We have been manufacturing rugged, mill duty, designs for over
35 years. We continue to support the thousands of units now operating in the
field. Avtron has over 30 models presently being manufactured at our factory in
Cleveland, Ohio.
THE AVTRON SMARTachª FOR STATE-OF-THE-ART DRIVE FEEDBACK
The M285, M485, and the M685 are SMARTachs. All SMARTachs have
special features that make them ideal feedback devices for continuous process
industries where reliability is critical and downtime is costly. Among these are
field-replaceable sensors with Adaptive Electronics and Fault Check Outputs with
diagnostic LEDs for Predictive Maintenance.
M285 SMARTach |
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M485 SMARTach |
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M685 SMARTach |
| Showing field replaceable
sensor |
Adaptive Electronics: (U. S. Patent #5,502,376) Every SMARTach
is equipped with a microprocessor that monitors and controls the duty cycle of
the output waveform. Pulse generators with replaceable sensors can have
variations in the output when new sensors are installed. Sensors cannot be
perfectly set at the factory due to unknown field conditions. Adaptive
Electronics will correct for any field variable to ensure a consistent, accurate
waveform throughout the life of the unit. This includes variations caused by
changes in thermal and mechanical conditions.
Fault Check: If the Adaptive Electronics attempts to correct
the signal but the waveforms continue to be out of specification, then the Fault
Check output will send an early warning signal, before the problem causes
unscheduled downtime. If the unit is equipped with the diagnostic LED option
shown below, the LED will change from green to red.
SMARTach Models are the M285 in the Heavy Mill Duty Class and
the M485 and M685 in the Severe Duty Class. ALL SMARTachs carry the CE label.
PULSE GENERATOR SELECTION
There are four basic factors that
need to be considered when choosing a pulse generator: The duty class,
mechanical mounting, sensor technology, and the electrical requirements.
1. ENVIRONMENTAL RATINGS
Mill Duty (MD): For use in most industrial environments like
paper, plastics, and metals. Not recommended for environments with frequent
temperature changes and chronically wet conditions. Models available in this
class include the M3 M945.
Heavy Mill Duty (HMD): For more rugged environments with
periodic temperature fluctuations and increased levels of contamination. Models
available in this class include the M285, M585, and M785.
Severe Duty (SD): This rating is for very wet and dusty
environments with large and frequent temperature extremes. This includes outdoor
applications. Models in this class include the M485 and M685.
2. MECHANICAL MOUNTING
Avtron pulse generators can be mounted several different ways. The standard
mounting methods include:
NEMA FC Face Mounting: Requires 8.5" C-face flange. Maximum shaft
diameter is 3.500". Model M285. |
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Shaft Mounting: Stub shaft required. Shaft depends on the pulse generator
selected. Models M3, M4 and M685 |
NEMA 56C Flange Mounting: Requires 4.5" C-face and adapter/coupling.
Models M945, M785, M3, M4, and M485. |
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Foot Mounting: This method is usually used when pulse generators are
coupled directly to rolls, gear boxes, or motors without C-faces. Models M945,
M785, M3, M4, and M485 |
3. SENSOR TECHNOLOGY:
Avtron uses two different sensor technologies to generate the
signals in our pulse generators, photoelectric and magneto-resistive. Both
technologies are field proven with thousands of successful installations. The
electrical requirements, mounting style, and environmental conditions will
influence the choice of sensors.
Photoelectric: Photoelectric sensing technology has been used
in our pulse generators since 1975. It has the capability of providing precise,
reliable waveforms when used in most industrial environments. The photoelectric
sensing circuit uses an LED light source that shines through a rotating disk.
The disk is made of either metal or plastic. On the opposite side of the disk is
a stationary mask assembly with corresponding slots, and a photocell. As the
disk rotates, the photocell sees an interrupted light source and generates a
corresponding waveform. A high performance line driver is used to amplify and
transmit the signal to the receiving device.
Photoelectric Models include the M3 and M945 in Mill Duty
Designs and the M585 and M785 in the Heavy Mill Duty Class.
Magneto-resistive: Avtron has used magneto-resistive technology
in our rotary pulse generators since 1983. Because dust or moisture does not
affect it, it is ideal for severe duty applications like paper mills, mines, and
dockside cranes. A magneto-resistive sensor detects a rotating wheel that is
encoded with a series of magnetic poles on its surface. As the poles pass the
sensor, a small change in resistance is detected and pulses are generated as a
result. A high performance line driver is used to amplify and transmit the
signals to the receiving device. Magneto-resistive Models include the M4 in the
Heavy Mill Duty Class and the M485 and M685 in the Severe Duty Class.
4. ELECTRICAL REQUIREMENTS
The electrical requirements that need to be defined are the
operating voltage, the pulses per revolution (PPR), the number of outputs, and
the marker pulse. The operating voltage options range from five to 24 volts DC.
The PPR choices range from one to 8,192. See pages 12 and 13 of the Avtron
Rotary Pulse Generator Brochure for more details.
APPLICATIONS
Avtron rotary pulse generators can be mounted on both AC and DC
motors. They are compatible with just about any motor enclosure, TEFC, TENV, or
motors equipped with a brake or other accessory. Motor Compatibility:
ABB
Baldor
Bull Electric
Emerson
General
Electric
Leeson
Lincoln
Marathon
Reliance
Rockwell
Siemens
TECO-Westing
house
Toshiba
USEM
WEG
Industries Served:
