Wheeled Encoder - R21 Series
R21 - Compact size and Rugged Construction
The model R21 is an optical shaft encoder in a 2" diameter x 1-7/8" (Ø51mm x 48mm) housing with an integral mounting arm, compatible with a variety of mounting accessories for installation either above or below a moving web or conveyor. When used with the MW-8 (8.00" circumference) or MW-20 (20.00cm circumference) measuring wheel it can accurately track the web or conveyor to within ±.007" or ±.016cm per revolution. This is not a light duty encoder - it was built with heavy duty bearings and solid construction for reliable, long-term operation in continuous duty applications.
Standard Features and Options:
• Generates pulses for accurate linear measurement
• Heavy Duty construction
• Compact size
• Precision 8" or 20cm circumference measuring wheel
• 16mm or M12 connector, or attached cable
• "Anti-Jitter" and other material handling features
• ESD, Short Circuit, Reverse Voltage protection
• Various mounting hardware kits are available
MECHANICAL
- Maximum Speed: 6,000 rpm
- Shaft Loading:
- Radial: 40 lbs. / 18.1 kg
- Axial: 30 lbs. / 13.6 kg
- Bearing Life: 32 x 1,000,000/rpm = hours
- Materials:
- Case: Aluminum, anodized
- Shaft: 303 Stainless steel
- Weight: 12 oz. (340 grams)
- Protection: IP50 (IP64 is available)
ELECTRICAL CONNECTIONS
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Optional 6-Pin
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Optional M12 4-pin
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Function
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Wire Color
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1
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3
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Common
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Black
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2
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1
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+vdc
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Red
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3
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-
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Output Z
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Brown
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4
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4
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Output A
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White
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5
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2
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Output B
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Green
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6
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-
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not used
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-
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6-pin connector is Amphenol T3402000 or equivalent M12 4-pin is Turck FS4.4/18.25 or equivalent
- Differential Line Driver Outputs:
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Optional 8-Pin Connector
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Function
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Wire Color
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1
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Output +A
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White
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2
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Output +B
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Green
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3
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Output +Z
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Yellow
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4
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Supply Voltage
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Red
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5
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Common
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Blac
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6
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Output -A
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Blue or Green
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7
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Output -B
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Brown
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8
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Output -Z
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Orange
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8-pin connector is Amphenol T3506000 or equivalent
Standard cable length is 10 ft / 3 meters. Other lengths are available
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ELECTRICAL
- Supply Voltages: (specify when ordering)
- Current:
- 50 mA max (no load)
- 100 mA max (line driver)
- Pulse Rate: 0 - 30 kHz
- Pulses per Revolution: (specify when ordering) 1 to 1200 (call for values up to 4800)
- Operating Temperature: 0° to 70° C
- Single Ended:
- 7273 open collector (30 VDC max, 50 mA max)
- 7272 Push-Pull (50 mA max source or sink)
- Differential Line Driver:
- 7272 differential line driver (also with optional 5vdc output level)
- Pulse symmetry: 180°±30%
- Pulse interval jitter: 30% max
- Quadrature: 90°±30% max
- Phase jitter: 30% max
- Output Circuit: (specify when ordering)
Output voltage level is approximately the same as the input voltage level.
- 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 outputs A or B. Output A leads B by 90° for clockwise rotation viewed from end by handle.
- Anti-jitter: (single output models only) Increases the pulse hysteresis to ½ of a pulse width, eliminating the effects of mechanical vibration and possible false output pulses. For example a 10 pulse per revolution output has 18° hysteresis (i.e. 360° ÷ 10 × ½ ).
Popular Models:
R21-1000/8-30C
R21-16AJ/8-30S3
R21QZ-1024/5DS
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