Encoders
7–14
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
S2I
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 through-
shaft design allowing additional
accessories to be mounted to the same
shaft. Both families come standard with
channels A, B and Z and dif
ferential line
driver (DLD) outputs. Single-ended
outputs are also supported at no
additional charge. All support shaft
sizes up to 1/2
I
in diameter
. Bulletin
844A and 844B Encoders of
fer 42
resolution options.
Specifications
Bulletin
844A & 844B Blind & Through-Shaft Optical Incremental Encoders
Housing
Temperature
Humidity
Protection
Shock
Vibration
Approximate Weight
Code Format
Quadrature
Symmetry
Power Requirements
Max Output Frequency
Resolution
Integral Cable
Output Drivers
Aluminum
0_C to 70_C (+32_F to +158_F)—Operating
–20_C to 85_C (–4_F to +185_F)—Storage
95% noncondensing
IP40 (IEC529)
20g/11ms
5g/10–150Hz
0.12kg (4oz)
Angular Acceleration
Moment of Inertia
Maximum Operating Speed
Permissible Shaft Movement
Shaft Loading
Shaft Size
50,000 radians/sec2
19.4gcm2 (2.75 x 10–4 oz-in-sec2)
3000rpm at max shaft loading
Radial 0.13mm (0.005in)
Axial ±0.76mm 〈±0.030in)
Axial 0.45kg (1lb)
Radial 1.36kg (3lb)
3/8I or 1/2I
2 channels with zero index
90_ ±22_ channel A leads B CW
40% to 60%
120mA (no load)
100kHz
Up to 2500 pulses per revolution
457mm (18in)
RS422 Line driver—3487
Open collector—7406
8–24V Line driver—7272
Electrical
Mechanical
Environmental