THE DMM
Principle of Operation
The DMM decoders are available with either output or input multiplexing. The resolver analog signals are converted to the output digital format by a tracking resolver-to-digital converter. With input multiplexing, the analog signals are multiplexed to a single digital converter. In output multiplexing, multiple decoders are multiplexed to the parallel digital output port. The binary code at the input selects a particular resolver for output, as well as the gear ratio for the selected resolver. Output multiplexing allows for a fast response and is recommended for high-speed operations. In the input multiplexing versions, there is a 100 msec settling time after a change in resolver selection before the data is stable. The output multiplexing has only 15 ps settling time.
Variety of Outputs, Built-in PC-Handshake permit Interface to any PLC
BCD, natural Binary, or Gray Code output formats are available with a choice of TTL, PNP (sourcing) transistor, or NPN (sinking) transistor outputs. Optional PLC synchronization circuit provides an error-free method of interfacing output position data from the decoder to any PLC. Upon receipt of a data transfer command from the PLC, the stable data is latched and made available to the PLC.
Multiplexing Capability
The TTL- type of outputs have multiplexing capability, which allows more than one decoder to be connected to the same control unit for multi-axis applications. For multiplexing PNP- or NPN-type outputs, consult the factory.
Up to 1024 Counts-per-Turn Resolution at 1800 RPM
The DMM series resolver decoders are available with resolutions of 1000 or 1024 counts-per-turn to match many control needs. The high-performance ratiometric-tracking converter assures exacting performance at speed up to 1800 rpm. |
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Selectable Resolver Gear Ratios
All DMM series resolver decoders are equipped with a standard, user-selectable resolver gear ratio feature. This allows resolvers with differing gear ratios to be connected to a single DMM, providing maximum machine application flexibility. Resolver gear ratios supported by the DMM include 16: 1, 32:1, 64: 1, and 128: 1.
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, radio frequency interference, and varying ground potentials. The ratiometric converter is practically immune to temperature variations and line frequency changes.
Optional optical isolation adds another layer of protection and enhances system integrity.
Extremely Rugged and Reliable Resolver as Position Transducer
The DMM series of resolver decoders 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 shaft in any hostile industrial environment, such as mechanical shock, vibrations, extreme humidity and temperature changes, oil mists, coolants, solvents, etc. The DMM decoder can be mounted up to 2500 ft (762 m) from the resolver in a control panel. |
