The User Interface U511 User’s Manual
3-30 Aerotech, Inc. Version 1.1
3.7.1. Troubleshooting Autotuning
Some tips for troubleshooting autotuning are given in Table 3-9.
Table 3-9. Troubleshooting the Autotune Process
Problem Possible Causes / Solutions
System responds with
"Could not calculate
gains!"
An axis fault has occurred.
Ki and Kp must be set > 0.
Vff must be set to 256.
Current is too high, lower Distance or Frequency.
Tracking rate of feedback device has been exceeded, lower Distance
or Frequency.
Top feedrate trap occurs. Lower Distance or Frequency, or defeat
trap if allowed.
Motor makes a loud
noise and shuts off
immediately
Gains are set too high, decrease Ki and Kp.
Motor commutation parameters are incorrect (AC motors only).
Encoder signals are missing, verify in Diagnostics.
Encoder is damaged, verify on Diagnostics.
Motor does not move at
all
Motor is not enabled.
Motor is disconnected.
Amplifier has faulted. Shut system off for 30 seconds and retry.
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