Eurotherm 590L Series, Product Manual, Page: 65 / 170

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Now perform an Autotune to identify and store the following Current Loop parameters:
PROP. GAIN
INT. GAIN
DISCONTINUOUS
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1. Main contactor open, i.e. no Start/Run signal.
2. Set the AUTOTUNE parameter to OFF.
3. Program Stop (terminal A7) and Coast Stop (terminal A8) should be high, i.e. 24V.
4. If the field is being supplied by a third-party controller, remove the field manually. (If the
field is internally regulated, Autotune automatically quenches the field).
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Set the AUTOTUNE parameter to ON.
•
Close the main contactor, i.e. Start/Run signal.
•
Energise the Enable terminal (A5).
The Autotune sequence is initiated. 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 5: “The Man-Machine Interface
(MMI) - Saving Your Application.
•
If necessary, restore field connections and remove the mechanical clamp.
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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
If during the Autotune sequence the motor speed feedback is greater than 20% of rated speed,
or the field current is detected above 6% of rated field current, then the Autotune sequence is
suspended causing the main contactor to drop out.
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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.
Produce a small step-change to the speed setpoint and observe the response on the
tachogenerator feedback.
Adjust the two parameters until you have rapid change of speed feedback between the setpoint
values, but with minimum overshoot.
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4
SETUP PARAMETERS
5
CURRENT LOOP
AUTOTUNE