Incremental Encoders Incremental encoders are sensors capable of generating signals in response to rotary movement. In conjunction with mechanical conversion devices, such as rack-and-pinions, measuring wheels or spindles, incremental shaft encoders can also be used to measure linear movement. The shaft encoder generates a signal for each incremental change in position. With the optical transformation, a line-coded disc made of metal, plastic or glass and positioned on a rotary bearing interrupts the infra red light ray emitted by gallium arsenid sender diode. The number of lines determines the resolution, i.e. the measuring points within a revolution. The interruptions of the light ray are sensed by the receptor element and electronically processed. The information is then made available as a rectangular signal at the encoder output. Examples for typical applications of incremental encoders: n Franking machines n Tampon printing machines n Door closing devices for trains n Ultrasonic welding n Desktop robots n Screwing machines n Lens grinding machines n Labelling machines n Plotters n x/y indication n Testing machines for optical n Analysis devices waveguides n Drilling machines n Scattering machines n Mixing machines ENCODERS COUNTERS CONTROLLERS INDICAT ORS RELAYS PRINTERS CUTTERS Shaft Encoders 2001 43 Incremental EncodersIncremental Encoders Type RI 30 RI 36 Special features n small encoder for industrial applications n small industrial encoder for high numbers of pulses n low power consumption n high immunity to interference n high operating safety n applications, e.g. n cable lengths up to 100 m CNC axles, machine tools, n suitable for high pulse frequencies robots, special machinery, n high level of protection high-speed winding machines n applications, e.g. CNC machine centers, handling systems, motors, medical technology, textile machinery Number of pulses 5 ... 1,500 5 ... 3,600 Technical Data - mechanical Flange S = synchro flange, R = round flange S = synchro flange, R = round flange Shaft diameter 5 mm 6 mm/6,35 mm Absolute max. shaft load radial/axial 30 N/15 N (6.5/3.3 lbs) 30 N/15 N (6.5/3.3 lbs) Absolute max. speed 10,000 RPM 10,000 RPM Torque 0.2 Ncm 0.3 Ncm Protection class Housing/Bearing IP 64/64 IP 64/64 General design as per DIN VDE 0160, protection class III as per DIN VDE 0160, protection class III Operating temperature -10...+70 C -10...+70 C Connection Cable axial/radial Cable or connector axial/radial Size 30 mm 36 mm Weight 60 g approx. 80 g approx. Technical data - electrical Output RS 422/push-pull RS 422/push-pull Supply voltage (SELV) 5 VDC/10...30 VDC 5 VDC/10...30 VDC Max. intrinsic power consumption 40 mA (5 VDC), 30 mA (24 VDC), 40 mA (5 VDC), 30 mA (24 VDC), 60 mA (10 VDC) 60 mA (10 VDC) Max. pulse frequency 300 kHz (RS 422) 300 kHz (RS 422) 200 kHz (push-pull)) 200 kHz (push-pull) Output load RS 422: 30 mA RS 422: 30 mA push-pull with short circuit protection: push-pull with short circuit protection: 30 mA (10...30 VDC) 30 mA (10...30 VDC) Alarm output NPN-O.C. 5 mA NPN-O.C. 5 mA Pulse shape Pulse duty factor 1 : 1 1 : 1 Pulse width error max. 25 electrical max. 25 electrical Page 61 65 44 Shaft Encoders 2001 EN C O D E R S COUNTERS CONTROLLERS INDICA T ORS RELAYS PRINTERS CUTTERS