590 Series DC Digital Drive Operating the Drive
4-17
Performing an Autotune
• Set the AUTOTUNE parameter to ARMATURE.
• Close the main contactor, i.e. Start/Run signal to terminal C3.
• Energise the Enable terminal (C5).
The Autotune sequence is initiated. The Keypad displays “AUTOTUNING” during the process. When complete (after approximately 10 seconds), the
main contactor is opened automatically signalling the end of the sequence and the AUTOTUNE parameter is reset to OFF.
• Perform a PARAMETER SAVE now. Refer to Chapter 6: “Man-Machine Interface (MMI)” - Saving Your Application.
• If necessary, restore field connections and remove the mechanical clamp.
Autotune Failed?
• The MMI displays the message AUTOTUNE ABORTED.
If any one of the Initial Conditions above are removed, or the Autotune sequence times out (after 2 minutes), then the Autotune sequence is aborted
causing the main contactor to drop out.
• The MMI displays the message AUTOTUNE ERROR
¾ The motor shaft was rotating, or was caused to rotate.
¾ The field current was seen to exceed 6%, when a field-off (default) Autotune had been selected.
¾ The drive to armature wiring was open-circuit.
¾ The discontinuous current boundary was found to exceed 200% of the nominated motor armature current rating
¾ Large imbalance in the three-phase voltages of the supply.
¾ A hardware fault relating to current feedback was detected on the control board.
NOTE Refer to Chapter 5: “Control Loops” - Current Control for manual tuning instructions.
Speed Loop Adjustment
You will need to adjust the Speed Loop for your particular application although in
most cases the default settings are acceptable. The optimum Speed Loop
performance is achieved by adjusting the PROP. GAIN and INT. TIME CONST.
parameters.
A PI controller is used to control the response of any closed loop system. It is used
specifically in system applications involving the control of drives to provide zero
steady state error between Setpoint and Feedback, together with good transient
performance.
Proportional Gain (PROP. GAIN)
This is used to adjust the basic response of the closed loop control system. The speed
error is multiplied by the Proportional Gain to produce a motor current demand.
MMI Menu Ma
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