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INTERBUS PROGRAMMABLE RESOLVER DECODER
MODEL DM7-IBS 

Front- PaneI-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.

Self-Diagnostics with Fault Output 
The DM7 is provided with an internal self-check circuit that continuously monitors if the microprocessor 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 operation, 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 integrity of the system.

 

Built-in Tachometer
The shaft RPM is continuously displayed on the front panel. Two additional outputs, one over-speed and the other under-speed, are provided as a front panel indicator only.

Program Security
A supervisory input is needed to make any changes to the program 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.

DM7-IBS SPECIFICATIONS

Input Power:
     AC:  105 to 135 VAC, 7 VA
     DC:  VCC1 VCC 1 5 V ±7.5%,160 mA
Operating Temperature:  -10°Fto+130°F(-23°Cto+55°C)
Position Transducer:  AVG Automation's series RL100, E7R, E8R, or RLI01 resolvers
Resolver Cable length:  2500 ft. (762 m) max., shielded

OUTPUTS:
InterBus Output:
Position Output Format:  Front panel selectable BCD,
     Gray Code, Binary

INPUTS:
Program Enable Input:
     Enable:  0.8 V max. @ 5 mA
     Disable:  4-28 VDC

  

NOTE: The output data generated by the DM7 module is sampled asynchronously by the InterBus interface within the unit. Therefore, there is a small possibility that the position data presented by the DM7-IBS module could have been changing when the Interbus interface read it, resulting in an erroneous reading. That reading could be any combination of the bits from two successive reads of the position. Use of the Grey Code output option should limit the error to one count. If your application cannot use the Grey Code output format and the position data is critical to the operation of equipment, it is recommended that the position data read from the DM7-IBS data be qualified by some means before it is used. One possible way to qualify the data would be to wait for two successive reads with the same position.

 
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