DM7 - Advanced Features

Programmable Full Scale Offset for Easy Set-Up

The resolver can be mounted on the machine without any concern for mechanically aligning the resolver zero to the machine zero. Once the resolver is coupled to the machine shaft, the only thing you have to do is to bring the machine to a known position, say home position, and set an offset number from the front panel keypad until the display reads zero posi-tion. This is especially useful during initial start up in that it reduces the set-up time. The offset can also be used to com-pensate for any machine wear.

Programmable Resolution: 20-4096 Counts-per-Turn

The programmable scale factor feature provides you the flexi-bility of selecting the resolution in the field. Now you do not have to worry about defining the resolution at the time of ordering the unit. The scale factor can be programmed from the front panel and can be any number between 19 and 4095 resulting in resolution of 20 to 4096 counts per turn. This feature allows you to scale the position to desired engineering units (inches, mm, etc.), if required.

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.

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 integrity 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 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.