Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 138)

138 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
• Bit 4 “Energized” indicates the resolver is energized.
• Bit 8 “Open Wire” indicates a problem with the cable (open circuit).
• Bit 9 “Power Supply” indicates problem with the option card's power
supply.
• Bit 10 “Diag Fail” indicates the option card has failed its power-up
diagnostics.
• Bit 11 “Select OK”
Resolver Cable Tuning Tests
Three tests are performed for resolver cable tuning. Two of the tests are
performed at power up and the third is performed when parameter 268
[Resolver0 Cnfg], bit 0 is set to “1”.
• Test #1: Compensation for cable phase shift. This test is run at drive power
up and corrects for phase in the feedback signals, Sine and Cosine signals.
The R/D converter synthesized reference signal is held constant and the
excitation signal is phase shifted to align the Sine and Cosine signals with
the R/D converter reference.
• Test #2: Cable Resonance correction. This test is run at drive power up
and corrects for excessively high voltage on the Sine and Cosine feedback
voltages. Generally, the excitation voltage is lower to reduce the feedback
voltage for both signals.
• Test #3: Voltage Balance. This test compares the Sine and Cosine feedback
signal amplitudes. In this case, the magnitudes of the two signals are
adjusted until they are equal. Note that one channel is held constant and
the other is adjusted. The voltage magnitudes can be different by as much
as +/-15% and still not affect operation.
Follow these steps to run test #3:
1. Set the drive stop mode to “Coast to Stop”.
2. Run the motor up in speed and stop the drive.
3. While the motor is spinning (coasting to a stop), set 268 [Resolver0 Cnfg],
bit 0 to “1”.
The cable tuning should complete before the motor stops spinning.
Heidenhain Feedback Option Card
The Quadrature Encoder output on the Heidenhain feedback option card allows
an A Quad B output for encoder emulation of 2048 pulses per revolution of the
Heidenhain device and (for firmware version 4.001) programmable EPR and
EGR functionality.