Lenze i700 - Manual (Page 110)

5 Motor control & motor settings
5.11 Setting control loops
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Lenze · i700 servo inverter · Reference manual · DMS 1.5 EN · 03/2014 · TD05
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6. Record the step response of the motor current with the oscilloscope function of the »PLC
Designer«/»EASY Starter«.
• Parameters to be recorded:
Actual D current ( 0x2DD1:1 or 0x35D1:1 for axis B)
Setpoint D current ( 0x2DD1:3 or 0x35D1:3 for axis B)
D voltage ( 0x2DD7:4 or 0x35D7:4 for axis B)
• Oscilloscope settings: Sampling rate = 0.0625 ms; time base = 2 ... 5 ms
Alternatively, the step response of the motor current in the motor phase U can be
measured by means of an oscilloscope and clamp-on ammeter.
7. Evaluate the step response:
8. Adjust the gain and reset time of the current controller.
9. Repeat steps 3 ... 6 iteratively until the optimum step response of the motor current is
reached.
• In the optimised state the current rise time typically is 0.5 ... 1 ms.
• If the adjustment does not provide any satisfactory results, the current controller
feedforward control via object 0x2941 (or 0x3141 for axis B) can be activated
additionally. Then steps 3 ... 6 are to be repeated.
10. To stop the test mode:
• Inhibit controller.
• Set object
0x2825 (or 0x3025 for axis B) to "0" to change back to the CiA402 mode.
11. For permanent storage: Upload changed current controller parameters ( 0x2942 or 0x3142
for axis B) from the i700 servo inverter into the Controller.
The »EASY Starter« serves to save the parameter settings of the i700 servo inverter as
parameter file (*.gdc). In the »PLC Designer«, this file can then be imported in the
corresponding axis.  Saving changed parameters safe against mains failure ( 60)
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