4-18 Operating the Drive
DC590+ Series DC Digital Drive
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 (also the HEALTH led is lit and the RUN led flashes).
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: “The Keypad - Saving Your Application.
• If necessary, restore field connections and remove the mechanical clamp.
Autotune Failed?
• The Keypad 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 Keypad 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 Autotune had been selected, or the field current stopped during a field-on Autotune.
¾ The drive to armature wiring was open-circuit.
¾ The discontinuous current boundary was found to exceed 200% of either the stack rating or 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
To Next Page
Loading...
