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The HEDS and also have a third channel index output in addition to the two channel quadrature. This index output is a 90 electrical degree, high true index pulse which is generated once for each full rotation of the codewheel. The HEDM series is nont available with a third channel index.
These encoders may be quickly and easily mounted to a motor. The quadrature signals and the index pulse are accessed through five 0. Standard resolutions between 96 and counts per revolution are presently available. Consult local Agilent sales representatives for other resolutions.
Quick and Easy Assembly? No Signal Adjustment Required? External Mounting Ears Available? Low Cost? Resolutions Up to Counts Per Revolution? Small Size? TTL Compatible? Typical applications include printers, plotters, tape drives, positioning tables, and automatic handlers. Note: Agilent Technologies encoders are not recommended for use in safety critical applications. ABS braking systems, power steering, life support systems and critical care medical equipment. Please contact sales representative if more clarification is needed.
These encoders emphasize high reliability, high resolution, and easy assembly. Each encoder contains a lensed LED source, an integrated circuit with detectors and output circuitry, and a codewheel which rotates between the emitter and detector IC. I, the index output. The light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the LED.
Opposite the emitter is the integrated detector circuit. This IC consists of multiple sets of photodetectors and the signal processing circuitry necessary to produce the digital waveforms. The codewheel rotates between the emitter and detector, causing the light beam to be interrupted by the pattern of spaces and bars on the codewheel. The photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and design of the codewheel.
These detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. Comparators receive these signals and produce the final outputs for channels A and B. Due to this integrated phasing technique, the digital output of channel A is in quadrature with that of channel B 90 degrees out of phase.
In the HEDS and , the output of the comparator for I and I is sent to the index processing circuitry along with the outputs of channels A and B. Block Diagram The final output of channel I is an index pulse PO which is generated once for each full rotation of the codewheel. This output PO is a one state width nominally 90 electrical degrees , high true index pulse which is coincident with the low states of channels A and B.
Pulse Width P : The number of electrical degrees that an output is high during 1 cycle. Pulse Width Error? State Width S : The number of electrical degrees between a transition in the output of channel A and the neighboring transition in the output of channel B.
State Width Error? Phase Error? One Shaft Rotation: mechanical degrees, N cycles. Position Error? Cycle Error? C : An indication of cycle uniformity. If the codewheel rotates in the clockwise direction, channel B will lead channel A.
Index Pulse Width PO : The number of electrical degrees that an index output is high during one full shaft rotation. Values are for the worst error over the full rotation. Part No. I rise after CH. A or CH. C PO t2 t2 Min. B or CH. A rise Note: See Mechanical Characteristics for mounting tolerances.
A max. These are tolerances required of the user. See Ordering Information. The recommended mounting screw torque for 2 screw and external ear mounting is 1. The recommended mounting screw torque for 3 screw mounting is 0. Electrical Interface To insure reliable encoding performance, the HEDS and three channel encoders require 2.
These pull-up resistors should be located as close to the encoder as possible within 4 feet. Each of the three encoder outputs can drive a single TTL load in this configuration.
However, 3. The use of aligning pins or alignment tool is recommended but not required to mount the HEDS and If these two channel encoders are attached to a motor with the screw sizes and mounting tolerances specified in the mechanical characteristics section without any additional mounting bosses, the encoder output errors will be within the maximums specified in the encoding characteristics section. The HEDS and can be mounted to a motor using either the two screw or three screw mounting option as shown in Figure 2.
The optional aligning pins shown in Figure 3 can be used with either mounting option. Figure 4 shows the necessary mounting holes with optional aligning pins and motor boss. Mounting Holes. Figure 3. Optional Mounting Aids. Mounting with External Ears. Tighten screws. Go on to step 2. With alignment tool in place, mount encoder baseplate onto motor as shown above.
Remove alignment tool. Snap encoder body onto base plate locking all 4 snaps. Push the hex wrench into the body of the encoder to ensure that it is properly seated into the code wheel hub set screws. Then apply a downward force on the end of the hex wrench. This sets the code wheel gap by levering the code wheel hub to its upper position. While continuing to apply a downward force, rotate the hex wrench in the clockwise direction until the hub set screw is tight against the motor shaft.
Remove the hex wrench by pulling it straight out of the encoder body. Use the center screwdriver slot, or either of the two side slots, to rotate the encoder cap dot clockwise from the one dot position to the two dot position.
Do not rotate the encoder cap counterclockwise beyond the one dot position. The encoder is ready for use! HEDS 2 ch. HEDS and Connectors.