The Model RH encoder, also known as a Pulse Position Indicator (PPI), generates tracking pulses for web applications, and in particular for material handling sortation applications when used with bar code laser scanners or CCD vision systems. 12" or 30cm circumference measuring wheels ride directly on the conveyor belt or web eliminating any slippage problems typically encountered with shaft encoders. With its double wheel construction, the encoder is self-aligning when allowed to pivot freely from its integral arm. The encoder’s weight is sufficient to maintain contact when mounted above the moving material. For mounting below the belt use MB-UB1 under belt mounting accessory.
Shaft rotation is converted into square wave output pulses to provide an accurate means of digitizing position, rate or direction of rotation. A shatter-proof optical disk attached to the encoder shaft interrupts an infrared light beam and photo sensor. Internal wave shaping circuitry provides a square wave output that is compatible with all popular counters and digital tachometers. When used with measuring wheels it can accurately measure inches, feet, centimeters, inches/min., feet/min., and many others.
Configurations consist of: unidirectional that produces a single output (output A) with the specified number of counts per revolution regardless of which direction the shaft is rotating; and quadrature that produces 2 outputs (A and B) for indicating amount and direction of shaft rotation. Both are also available with optional index output (output Z).
The Anti-Jitter option was designed for conveyor and web systems that require continuous and accurate measurement of the web's movement even if the system must be stopped and restarted without reset. “Anti-Jitter eliminates the effects of mechanical vibration and the possible dither that results in false output pulses and the subsequent erroneous counts when the system is actually “stopped”. “Anti-jitter” is available on single output models with up to 60 counts per revolution.
Features and Options:
Ultra heavy duty construction
Accurate linear measurement. Tracks conveyor movement independent of conveyor roller diameters.
Exclusive "Anti-Jitter" circuit for conveyor applications
Single (A), quadrature (A, B), and index (Z) outputs
3-pin is C-5015 style 97-3102A-10SL-3P or equivalent 6-pin is C-5015 style 97-3102A-14S-6P or equivalent; or 16mm Amphenol T3402000 or equivalent 4-pin is 12mm Turck FS4.4/14.5 or equivalent
Blue or Green
Yellow or Green
Orange or Brown
6-pin is C-5015 style 97-3102A-14S-6P or equivalent 8-pin is 16mm Amphenol T3506000 or equivalent 10-pin is C-5015 style 97-3102E-18-1P or equivalent see M226 modification drawing for additional details.
DC Supply Voltages: (specify when ordering)
5 ± 5%, 5-26 vdc, or 8-30 vdc
50 ma max (no load)
100 ma max (differential line driver)
Pulse Rate: 0 - 30 kHz
Counts per Revolution: (specify when ordering)
1 to 1200
1 to 2400 (single output only)
Operating Temperature: 0° to 70° C
Output Circuit: (specify when ordering) Output voltage level is approximately the same as the input voltage (unless specified)
Single Ended: 50ma max current
Current sinking NPN with pull-up
NPN open collector (30 vdc max)
Current sourcing PNP with pull-down
Differential Line Driver:
7272 line driver
RS422 - 5vdc output voltage level (requires 5 or 8-30 supply voltage)
Output Waveshape: Square wave; outputs A and B are 50/50 duty cycle nominal; output Z (index output) is approximately the width of one cycle on output A or B. Output A leads B by 90° for clockwise rotation viewed from shaft end farthest from the connector.
Pulse symmetry: 180°±30%
Pulse interval jitter: 30% max
Quadrature: 90°±30% max
Phase jitter: 30% max
Anti-jitter: Increases pulse hysteresis to ½ of a pulse width, eliminating the dither caused by excess mechanical vibration and the resulting false output pulses. Call for details.
Wheels & Couplings Information
Here is a listing of the Measuring Wheels for the RH. For more information, please click on the part number. Each RH encoder comes with a two measuring wheels.