404/406XR Series Product Manual
Chapter 3 - Component Specifications
19
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Chapter 3 - Component Specifications
Linear Encoders
Description
Specification
Input Power
5 VDC +/- 5% 150mA
Output (incremental)
Square wave differential line driver (EIA RS422) 2
channels A and B in quadrature (90) phase shift
Reference (Z channel)
– see Section 2.312
for additional information
Synchronized pulse, duration equal to one resolution
bit. Repeatability of position is unidirectional moving
toward non-motor end.
Positional Accuracy
+/- 3 microns after linear slope correction
Maximum Speed
– see Chapter 2 for
additional information
1.0 micron resolution = 3.0 meters/sec
0.5 micron resolution = 1.5 meters/sec
0.1 micron resolution = 0.3 meters/sec
Z-Channel Position Reference
The Z channel is an output on the encoder. Many Servo Controllers support this input. The Z channel on
the 404XR is located at Mid Travel. The Z channel is a unidirectional device. This means that the final
homing direction must occur in one direction. The 404XR is set that the final home direction is to be
toward the non-motor end of the table. The repeatability of the Z channel is equal to +/- 2 resolution
counts of the encoder (except for 0.1 micron scales which have a repeatability of +/-1 microns). Thus
the repeatability of the “Z” channel equals:
Encoder Resolution
Z Channel Repeatability
1 micron
+/- 2 micron
0.5 micron
+/- 1 micron
0.1 micron
+/- 1 micron
NOTE: Home Repeatability is also very dependent on Controller input speed and Homing algorithms.
The above repeatability does not include possible controller tolerance. Additionally, to achieve the
highest repeatability the final homing speed must be slow. Slower final speed usually results in higher
repeatability.
NOTE
: The “Z” channel output is only one resolution count wide. Thus the
on-time
may be very brief.
Due to this some controllers may have difficulty reading the signal. If you are experiencing the positioner
not finding the “Z” channel during homing, try reducing final homing speed; also refer to your controller
manual for frequency rates of the “Z” channel input.
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