M1890 PROGRAMMABLE POSITION
TRANSDUCER AND PROGRAMMABLE SELSYN INDICATOR
absolute position sensor,
resolver input, 5-digit BCD output
electromechanical Selsyn systems
presettable; yet absolute
Simple front panel
programming of counts-per-
turn, no mechanical gear trains
nonvolatile EEROM memory
PC handshake for PLC
Reliable under extreme
oil-tight front plate
1 Part in 100,000
resolution and repeatability
Add limit settings
Optional serial link to
computers or remote displays
AVG Automation would like to introduce you to a unique position encoder, the Programmable Position Transducer or PPT. The PPT is an absolute position sensing device which accepts resolver inputs, converts position data to 5-digit BCD output, and is prescalable and presettable over a wide-range of electronic gear ratios. It operates in a single-or multi-turn mode with high-accuracy and can resolve linear distances of I part in 100,000 whether it be 0.00 1 " (0.025 mm) over 100" (2540 mm) or 1 foot (304.8 mm) over 18.93 miles (30.46 km) of travel. The versatile electronic design assures simple interface to other limit setting or control devices.
The PPT consists of two parts, one is a position sensor mounted on the machine shaft and the other is a programmable unit mounted in the machine control panel. The position data from the sensor is converted to binary data by an internal ratiometric converter in the programmable unit, processed in the microprocessor together with other program variables and displayed on the front panel display. A parallel BCD output is also made available to provide information to other systems requiring positional data.
Prescalable, Presettable; Yet Absolute
A wide-range of easy to set programmable scale factors eliminates the need of mechanical gear trains and prescales the display to readout directly in engineering units. Any preset number can be jammed into the position "counter" by a front panel switch or an external signal, thus "offsetting" or "rezeroing" the machine in no time.
The PPT is unique in that it can be prescaled and preset and still is absolute over the entire-range in single-turn operation. In multi-turn applications it keeps track of the true position, if the resolver movement does not exceed half-a-revolution (<180°) after power loss.
Simple Front-Panel Programming
The PPT is fully front-panel programmable for all variables, and yet secure against any unauthorized program changes. Opening of an external user-provided keyswitch inhibits any program changes on the front panel.