4 optimising the current controller, Optimising the current controller, 5motor interface – Lenze 9400 User Manual
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5
Motor interface
5.5
Sensorless vector control (SLVC)
178
Lenze · Servo-Inverter 9400 HighLine · Reference manual · DMS 10.0 EN · 11/2013 · TD05/06
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5.5.3.4
Optimising the current controller
In a test mode you can select current setpoint step-changes and optimise the parameter settings of
the current controller (gain and reset time) by evaluating the step responses.
• The starting values for gain and reset time can be calculated with the following formula:
How to optimise the current controller in the test mode:
1. If the controller is enabled, inhibit the controller, e. g. with the device command
= "41: Inhibit controller".
2. Activate one of the two following optimisation modes for the current controller:
•
= "3: Current controller optimisation mode":
After controller enable, the motor is supplied with current as long as the controller is
enabled.
•
From software version V7.0:
= "4: Current controller optimisation mode pulse":
The motor is supplied with voltage for 50 ms after controller enable. Due to this time
limit, the load of the machine is reduced. Afterwards, the controller is inhibited
automatically.
3. Select the effective value of the current setpoint step change under
• The peak value of the measurable motor current will be 1.41 times higher.
4. Enable the controller for a short time and measure the step response of the motor current
in the motor phases using the oscilloscope and clamp-on ammeters or record the field-
oriented direct-axis current using the
function in »Engineer«.
• Variable of the motor control to be recorded:
Current.dnActualDirectCurrent (field-oriented direct-axis current)
Note!
Only required for sensorless vector control if one of the following functions is used.
•
•
Gain
Stator leakage inductance
340 μs
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=
Reset time
Stator leakage inductance
Stator resistance
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=