Specifications

A-33
800-TEC-ENGR
www.avg.net
Position Transducers/Sensors
SECTION
A
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 convert-
er. 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 recom-
mended 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 multi-
plexing has only 15 µs settling time.
Variety of Outputs, Built-in PC-Handshake
permit Interface to any PLC
BCD, natural Binary, or Gray Code output formats are avail-
able 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 resolu-
tions 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.
Selectable Resolver Gear Ratios
All DMM series resolver decoders are equipped with a stan-
dard, 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 tempera-
ture 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 rugged-
ness of a resolver and reliability of an advanced solid-state con-
trol. The rugged, heavy-duty NEMA 13 (IP54) resolver can be
mounted on a machine shaft in any hostile industrial environ-
ment, 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.
DMM MULTI-AXIS MULTI-TURN
RESOLVER DECODERS