Rockwell Automation 8510 Hi-Res Feedback Instructions - Manual (Page 2)

High Resolution Magnetic Feedback
Instructions
2
The Analog Sensing Head is mounted to the spindle head stock with a
small gap between the teeth of the detecting gear and the face of the sensor.
As each gear tooth passes the sensor face, a sine-cosine waveform is
produced by the sensor. The 8510 drive can decode this information to
resolve each gear tooth into 1000 parts.
Due to a mechanical design that requires no bearings or couplings, and the
high frequency capacity of the control electronics, this system can operate
properly at spindle speeds as high as 30,000 rpm.
Features
n The sensing device has no bearings and does not contact the detecting
gear, eliminating mechanical wear and extending the life of the sensor.
n Resolutions from 225,000 to 500,000 parts/revolution can be achieved
for precision orienting capability.
n The feedback device is directly mounted to the spindle shaft without the
use of belts, gears, etc., thus, backlash does not effect positioning
accuracy.
Specifications Refer to the Figure 1 for detailed dimensions of the Detecting Gear and
Figure 2 for Sensing Head dimensions.
Detecting Gear Number of Resolution Absolute
Catalog Number Teeth 1 Gear Class Parts/Rev Accuracy 2
8510SA-PG225 225 Standard 225,000 0.067 degrees
8510SA-PG256 256 Standard 256,000 0.058 degrees
8510SA-PG300 300 Standard 300,000 0.048 degrees
8510SA-PG400 400 Standard 400,000 0.036 degrees
8510SA-PG500 500 Standard 500,000 0.030 degrees
8510SA-PG500P 500 Precision 500,000 0.015 degrees
1 By special order, gears are also available with 360, 650, and 800 teeth and all gears can be special
ordered in the precision class.
2 Gear and sensor mounting accuracy must meet the specifications defined in this publication in order
to achieve the absolute accuracy specified above.
Environmental Specification
Storage temperature range: –30
°
C to +70
°
C (–22
°
F to +159
°
F)
Operating temperature range: –10
°
C to +60
°
C (+14
°
F to +140
°
F)
Allowable vibration range: To maximum of 8G
Allowable shock range: To maximum of 100G
Allowable dead load on the sensor face: 10 kg/cm 2 (140 lb./in 2 )
Allowable impact load on the sensor face: 3 kg/cm 2 (40 lb./in. 2 )
Sensor Enclosure sealing rating: IP66