
CME 2 User Guide Control Loops
Copley Controls 121
Manually Tune the Velocity Loop
METHOD: Apply square-wave excitation to velocity loop and adjust proportional gain
(Vp) and integral gain (Vi) to obtain desired waveform. For instance:
NOTE: During tuning, observe any warnings that appear to the left of the trace.
Choose Velocity from the Function Generator Apply To:
list.
On the Settings tab, make sure Auto Setup is selected.
Auto Setup automatically sets the following parameters:
10% of maximum velocity value.
Limited velocity (green).
Actual Motor Velocity (white).
Verify that Amplitude value is not excessive for the motor.
On the Gains tab, adjust velocity loop proportional gain (Vp):
Set velocity loop integral gain (Vi) to zero.
Raise or lower proportional gain (Vp) to obtain desired step response. (Typically,
little or no overshoot on a 5 Hz small, slow-speed square wave.)
Adjust velocity loop integral gain (Vi) until desired settling time is obtained.
Press Stop to stop the function generator.
On the Main screen, click Save to Flash to avoid losing the changes.
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