Aerotech XC2e, Hardware Manual, Page: 42 / 92

2.3.1.3. Sine Wave Encoder [-MX2/-MX3 Option]
The Sine Wave Encoder option supplies higher positioning resolution by subdividing the fundamental
output period of the encoder into smaller increments. The amount of subdivision is specified by the
PrimaryEncoderMultiplicationFactor [A3200: EncoderMultiplicationFactor] parameter. Use the Feedback
Tuning tab of Digital Scope to automatically adjust the value of the gain, offset, and phase balance
controller parameters to get the best performance. For more information, refer to the Help file.
High resolution or high-speed encoders can require increased bandwidth for correct operation. Use the
High Speed Mode of the PrimaryEncoderMultiplierSetup [A3200: EncoderMultiplierSetup] parameter to
enable the high bandwidth mode. Because this mode increases sensitivity to system noise, use it only if
necessary.
The XC2e can generate emulated encoder signals. These signals can be output on the Auxiliary Encoder
(AUX) connector or used internally by the PSO. Refer to the EncoderDivider and
PrimaryEmulatedQuadratureDivider [A3200: EmulatedQuadratureDivider] parameters and the
ENCODER OUT command in the Help file for more information.
For the highest performance, use twisted pair double-shielded cable with the inner shield connected to
signal common and the outer shield connected to frame ground. Do not join the inner and outer shields
in the cable.
Table 2-15: Analog Encoder Specifications
Specification Value
Input Frequency (max) 450 kHz, 2 MHz
Input Amplitude
(1)
0.6 to 1.75 Vpk-pk
Interpolation Factor (max)
-MX2 65,536
-MX3 Primary: 65,536 Auxiliary: 16,384
-MX2/-MX3 Primary Encoder Channel
Interpolation Latency
800 nsec (analog input to quadrature output)
Input Common Mode 1.5 to 3.5 VDC
(1) Measured as SIN(+) - SIN(-) or COS(+) - COS(-)
Figure 2-14: Analog Encoder Phasing Reference Diagram
2.3.1. Primary Encoder Inputs XC2e Hardware Manual
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