Series 51

Product catalog summary

Overview: This document provides technical specifications and details for Grayhill's Series 51 mechanical encoders, which are used for binary or binary complement code generation. The encoders are designed for PC mounting with a 30° angle of throw and offer 2 to 12 positions.

Specifications: The encoders have a diameter of 0.562 inches and can handle a current of 200 mA. They feature adjustable stop versions and are available in both sealed and unsealed styles. The electrical rating includes making and breaking 125 mA at 30 Vdc resistive load for 25,000 cycles. Contact resistance is initially 20 milliohms, with a maximum of 300 milliohms after life. Insulation resistance starts at 50,000 megohms, reducing to 10,000 megohms after life. Voltage breakdown is rated at 500 Vac between mutually insulated parts.

Features: The encoders include a shaft and panel seal, with the panel sealed by an o-ring at the base of the bushing and the shaft sealed by an o-ring inside the bushing. Adjustable stops allow for setting and resetting to limit rotation, with options for continuous rotation by removing stop blades.

Materials and Construction: The encoders are constructed with thermoset plastic bases, nylon detent rotors, and stainless steel components for the shaft, stop blades, stop arm, thrust washer, and retaining ring. Detent balls are steel and nickel-plated, while the bushing is zinc and tin-zinc-plated. Terminals are brass with a silver contact surface and gold-plated. The rotor contact is made of beryllium copper with a silver contact surface.

Ordering Information: The document provides part numbers for various configurations, including fixed stop, continuous rotation, and adjustable stop versions. The suffix '-C' indicates continuous rotation, while '-F' indicates a fixed stop between positions 1 and 12.

Additional Characteristics: The encoders use wiping contacts, with the switch position defined as opposite the shaft flat. The document includes detailed circuit diagrams and truth tables for binary and binary complement codes.

Catalog excerpts

Mechanical Encoders Binary or Binary Complement Code Features • PC Mount, 30° Angle of Throw • 2 to 12 Positions • .562" Diameter, 200 mA • Shaft and Panel Seal • Adjustable Stop Versions Dimensions in Inches (and millimeters) .250 – .015 (6,35 – 0,38) .537 + .020 .030 (13,64 + 0,51 0,76) .382 (9,70) TERMINAL CIRCLE OF CENTERS See circuit diagrams for omitted terminals. All switches are provided with PC mount terminals. Grayhill part number and date code marked on label. Customer part number marked on request. CIRCUIT DIAGRAMS Switch is viewed from the shaft end and shown in switch position number 1, which is decimal number zero and BCD number zero. Indicates Terminal is present. Indicates Terminal is omitted. Note: Connections must be made on PC board to generate code output. Switch position numbers do not correspond to the decimal input or binary output. See Truth Tables. TIED TOGETHER ON PC BOARD 1 OUTPUT TIED TOGETHER ON PC BOARD TIED TOGETHER ON PC BOARD TIED TOGETHER ON PC BOARD ROTATING CONTACTS TIED TOGETHER ON PC BOARD TIED TOGETHER ON PC BOARD Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois TIED TOGETHER ON PC BOARD Optical and Mechanical Encoders .232 (5,89) COMMON CIRCLE OF CENTER

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Mechanical Encoders Grayhill, Inc. • 561 Hillgrove Avenue • LaGrange, Illinois 60525-5997 • USA • Phone: 708-354-10

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