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2.8.3. Sine Wave Encoder [-CT4 Option]
The Sine Wave Encoder option provides higher positioning resolution by subdividing the fundamental
output period of the encoder into smaller increments. The amount of subdivision is specified by the
AuxiliaryEncoderMultiplicationFactor parameter. Use Encoder Tuning [A3200: Feedback Tuning] to
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 AuxiliaryEncoderMultiplierSetup parameter to enable the high bandwidth
mode. Because this mode increases sensitivity to system noise, use it only if necessary.
You can use a sine wave encoder with the -CT4 multiplier option as an input to the PSO. The -CT4 option
generates emulated quadrature signals.
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 2-40:
Sine Wave Encoder Specifications
Specification
Value
Primary
Auxiliary
Input Frequency (max)
450 kHz, 2 MHz
Input Amplitude
(1)
0.6 to 1.75 Vpk-pk
Interpolation Factor (max)
-CT1
16,384
N/A
-CT2
65,536
N/A
-CT4
65,536
65,536
-CT2/-CT4 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 2-38:
Sine Wave Encoder Phasing Reference Diagram
XR3 Hardware Manual
2.8.3. Sine Wave Encoder [-CT4 Option]
www.aerotech.com
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