Encoders Bulletin 844A & 844B Blind & Through-Shaft Optical Incremental Encoders Specifications Electrical Code Format 2 channels with zero index Quadrature 90_ 22_ channel A leads B CW Symmetry 40% to 60% Power Requirements 120mA (no load) Max Output Frequency 100kHz Resolution Description Bulletin 844A blind-shaft and 844B through-shaft incremental encoders are used to electronically monitor the position or speed of a rotating shaft. Shaft position is converted to digital pulses in an A quad B format. S Blind or through-shaft designs S Integral flex mount S 10 to 2500 PPR S 2I diameter housing Bulletin 844A and 844B encoders offer a built-in flexible coupling which reduces installation cost and mounting space requirements. Additionally, the Bulletin 844B Encoder is a throughshaft design allowing additional accessories to be mounted to the same shaft. Both families come standard with channels A, B and Z and differential line driver (DLD) outputs. Single-ended outputs are also supported at no additional charge. All support shaft sizes up to 1/2I in diameter. Bulletin 844A and 844B Encoders offer 42 resolution options. 7-14 Up to 2500 pulses per revolution Integral Cable 457mm (18in) Output Drivers RS422 Line driver--3487 Open collector--7406 8-24V Line driver--7272 Mechanical Angular Acceleration 50,000 radians/sec2 Moment of Inertia 19.4gcm2 (2.75 x 10-4 oz-in-sec2) Maximum Operating Speed 3000rpm at max shaft loading Permissible Shaft Movement Radial 0.13mm (0.005in) Axial 0.76mm 0.030in) Shaft Loading Axial 0.45kg (1lb) Radial 1.36kg (3lb) Shaft Size 3/8I or 1/2I Environmental Housing Aluminum Temperature 0_C to 70_C (+32_F to +158_F)--Operating -20_C to 85_C (-4_F to +185_F)--Storage Humidity Protection 95% noncondensing IP40 (IEC529) Shock 20g/11ms Vibration 5g/10-150Hz Approximate Weight 0.12kg (4oz) Encoders Bulletin 844A & 844B Blind & Through-Shaft Optical Incremental Encoders Selection Guide 844 A -- Z3 a 05C 2500 c d b a c d Coupling Options Power Supply & OutputE Resolution (PPR) Code Description A Front (Blind-Shaft) Code Description Code Description 05D 5V DC In, 5V DC DLD RS-422 Out 0010 10 0020 20 0030 30 0050 50 0060 60 0100 100 0128 128 0150 150 0180 180 Accessories 0200 200 Description 0240 240 0250 250 0256 256 0300 300 0336 336 0360 360 0400 400 0500 500 0512 512 0600 600 0720 720 0800 800 0900 900 B Rear (Through-Shaft) b 05C 5V DC In, NPN Open Collector Out Shaft Options 12C 12V DC In, NPN Open Collector Out Code Description Z3 3/8I Z4 1/2I Differential Encoder Buffer Board 24D 8-24V DC In, 8-24V DC DLD Out E DLD = Differential Line Driver Page Number 7-58 0960 960 1000 1000 1024 1024 1140 1140 1152 1152 1200 1200 1230 1230 1250 1250 1260 1260 1270 1270 1386 1386 1500 1500 1512 1512 1800 1800 1888 1888 2000 2000 2048 2048 2400 2400 2500 2500 7-15 Encoders Bulletin 844A & 844B Blind & Through-Shaft Optical Incremental Encoders Electrical Connections Function Line Driver Wire Color Output Waveforms Open Collector Wire Color V DC Red Red Common Black Black A Output White White B Output Green Green Z Output White/Black White/Black A Output Blue NC B Output Orange NC Z Output Red/Black NC Shield Drain Wire Drain Wire Channel 1. Channel A leads Channel B for clockwise rotation when viewed from face of the encoder. A 2. Complementary signals (A, B, and Z) are supplied only on units with line drivers. B 3. Marker Pulse is nongated and is approximately centered on the positive-going edge of Channel B for clockwise rotation and is 180_ 90_ wide. Z Dimensions--mm (inches) 76.2 (3.0) 10_ #3-48 Head Cap Screw 30_ 457 (18.0) #3-48 Head Cap Screw 10_ 60.3 (2.37) 68.6 (2.70) 76.2 (3.0) 457 (18.0) Shielded Cable 4.57 (0.18) 60.3 (2.37) 68.6 (2.70) 30_ 30_ 30_ 50.8 (2.00) 50.8 (2.00) 3.3 (0.13) Typ 29.7 (1.17) Max 40.6 (1.60) Max 40_ Typ 5.08 (0.20) 3.3 (0.13) Typ 29.2 (1.15) 42.7 (1.68) 40_ Typ 9.55/9.60 (0.376/0.378) 12.73/12.78 (0.501/0.503) Dia. 9.55/9.60 (0.376/0.378) 12.73/12.78 (0.501/0.503) Dia. Bulletin 844A 844A Mating Shaft Tolerance-- mm (inches) Bore Diameter Length 3/8I 9.50/9.55 (0.374/0.376) 10.7/31 (0.42/1.22) 1/2I 12.67/12.73 (0.499/0.501) 10.7/31 (0.42/1.22) 7-16 24.9 (0.98) Bulletin 844B 844B Mating Shaft Tolerance-- mm (inches) Bore Diameter 3/8I 9.50/9.55 (0.374/0.376) 1/2I 12.67/12.73 (0.499/0.501) Length (minimum) 41 (1 (1.6) 6)