Aerotech Automation1 iXC2e, Hardware Manual

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2.3.1.3. Sine Wave Encoder (Primary) [-MX2/-MX3 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 PrimaryEncoderMultiplicationFactor parameter. Use Encoder 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 PrimaryEncoderMultiplierSetup parameter to enable the high
bandwidth mode. Because this mode increases sensitivity to system noise, use it only if necessary.
This option is only available on the Primary encoder input.
The drive 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 parameters and the encoder output functions 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 2-16: Sine Wave Encoder Specifications
Specification
Value
Primary Auxiliary
Input Frequency (max) 200 kHz, 2 MHz 200 kHz
Input Amplitude
(1)
0.6 to 1.75 Vpk-pk
Interpolation Factor (max)
-MX2 65,536 N/A
-MX3 65,536 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 2-16: Sine Wave Encoder Phasing Reference Diagram
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iXC2e/XC2e Hardware Manual 2.3.1. Primary Encoder Inputs