ACCESSORIES MLC650 SERVICE/MAINTENANCE MANUAL
10-48
Published 09-09-16, Control # 229-09
VPC Counterweight Tray Absolute Encoder
Absolute Encoder Overview
The absolute encoder determines its position using a static
reference point. Inside the encoder are two discs, both with
concentric rings with offset markers. One of the discs is fixed
to the shaft; the other moves freely. As the disc on the shaft
turns, the markers along the track of the encoder change
position on the fixed disc.
Each configuration along the disc of an absolute encoder
represents a unique binary code. When a program looks at
the binary code, it determines the absolute position of the
tray. The relationship between the encoder value and the
physical position of the tray is set at assembly. The system
does not need to return to a calibration point to maintain
position accuracy.
Absolute Encoder Backlash Adjustment
1. Loosen the encoder mounting capscrews. Position the
encoder so that it is tightly meshed with the pinion gear.
Do not apply radial load to the encoder shaft.
2. Slide the encoder mounting bracket back approximately
1,5 mm (0.06 in).
This will create approximately 1,1 mm (0.04 in) of
backlash.
3. Tighten the mounting capscrews.
Item Description
1 VPC Counterweight Tray
2 Absolute Encoder
3 Speed Sensor
4 Speed Sensor
FIGURE 10-37
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