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       Products: Encoders: 21AL Series Modular Encoder       
       Electrical Connections
       Output Charateristics
       Ordering Information
       Outline Dimensions
       Standard Mounting Pattern
FEATURES
  • Cast base and cover
  • Self Gapping
  • Resolution 20 - 1250 pulses per revolution
  • Frequency response to 200 KH
  • Wide Selection of Hub Bore sizes and terminations
  • 12 Month Warranty

DESCRIPTION
The 21Al series Modular is highly reliable, low cost encoder using the latest SMT technology.

Installation and set-up is dramatically simplified with the gap/cam mechanism. The modular is aligned and gapped with the clockwise 90∞ turn of the cam. No further adjustments are required.

ELECTRICAL
  • Code— Incremental
  • Resolution—20-1250 cycles per revolution
  • Supply Voltage—5VDC
  • Supply Current—140 MA max
  • Light Source—LED
  • Output Format
    • Two count channels electrically phased 90° ± 25°
    • One (optional) Zero Reference signal see fig#2
  • Output Signal
    • Vhigh=Vs thru 4.7K pull-up
    • Vlo = .5 volts max
    • Rise/fall time 1.0 µsec max
  • Symmetry (duty cycle)—180° ± 10°
  • Frequency Response—0 -200 KHz
  • Output Device
    • TTL 7404
    • TTL 7406 Open Collector
    • CMOS — MC4069
    • Line Driver SN 75183D or 26LS 31CM
MECHANICAL
  • Dimensions— See outline drawing
  • Weight—3 oz. max
  • Moment of Inertia—1 x 10-4 oz.-in. sec2
  • Hub Bore Size
  • Nominal 1/4", 3/8", 1/2", 5/8" are standard, special sizes and mm diameters are available
  • Operating Temp
    • 0° to 70°C (32° to 158°F)
    • -25°C to 125°C
  • Slew Speed —10,000 rpm
  • Accuracy — ±.2 min of ARC
  • Materials— CAST ALUM.BASE/COVER
  • Code Disc Material— Acrylic , Metal
  • Precision Chrome on glass
ELECTRICAL CONNECTIONS

OUTPUT CHARACTERISTICS

ORDERING INFORMATION

OUTLINE DIMENSIONS

STANDARD MOUNTING PATTERN

FIGURE 1