Specifications

Front-Panel-Selectable Output Formats: BCD,
Binary, or Gray Code
The DM7 is an extremely versatile resolver to digital decoder.
Now you do not have to define the output format at the time
of ordering the unit. Depending upon your application, the
output format such as BCD, Natural Binary, or Gray code can
simply be selected from the front panel keypad. This means
one unit for various applications.
Built-in PC synchronization
PC synchronization is built in as standard in DM7 resolver-to-
digital decoder. Depending upon the application it can be
selected from the front panel keypad to operate with or with-
out PLC synch circuit. When selected to operate with PLC
synch circuit, it provides an error-free method of interfacing
BCD or binary position data from the decoder to any PLC in
the market. Upon receipt of a data transfer command from the
PLC the stable data is latched and made available to the PLC.
When selected to operate without PLC synch circuit (transpar-
ent or Microfreeze mode), the position data is continuously
updated. At the data transfer command from a microcomput-
er, the data is latched for 100 ±10 µs to enable the microcom-
puter to read the information.
Self-Diagnostics with Fault Output
The DM7 is provided with an
internal self-check circuit that con-
tinuously monitors if the micro-
processor is not in reset, input 120
VAC power, DC power supplies,
resolver cable, and output enable
circuit. In case a fault occurs in any
one of the above critical functions,
the unit goes into fault mode and a
transistor output changes state
from ON to OFF. For failsafe oper-
ation, the fault output is ON for
normal operation and turns OFF
when a fault occurs. During the
fault mode all outputs are disabled
automatically.
Highly Noise Immune
Circuitry
The ratiometric tracking converter
technique employed for resolver-to-
digital decoding provides the best
protection against electrical noise
generated by power line transients
and varying ground potentials. This
decoding method is inherently
immune to temperature changes and line frequency variations.
The optical isolation adds an additional layer of protection
against electrical noise and enhances the environmental integri-
ty of the system.
Built-in Tachometer & Over/Under Speed
Switch
The shaft RPM is continuously displayed on the front panel.
Two additional outputs, one over-speed and the other under-
speed, are provided. The reference speed values are entered
from the front panel.
Program Security
A supervisory input is needed to make any changes to the pro-
gram to protect against unauthorized tampering.
Rugged and Reliable Resolver as Position
Transducer
The DM7 series of resolver decoder combines the ruggedness
of a resolver and reliability of an advanced solid-state control.
The rugged, heavy-duty NEMA 13 IP54 resolver can be
mounted on a machine in any hostile industrial environment
such as mechanical shock vibrations, extreme humidity and
temperature changes, oil mist, coolants, solvents, etc. And the
resolver-to-digital decoder can be mounted up to 2500 feet
away in a control panel.
800-TEC-ENGR
www.avg.net
A-28
Position Transducers/Sensors