Lenze i700 - Manual (Page 123)

Lenze · i700 servo inverter · Reference manual · DMS 1.5 EN · 03/2014 · TD05
123
5 Motor control & motor settings
5.12 Fine adjustment des motor model
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Distribution of the grid points
• The saturation characteristic is represented by means of 17 grid points.
• The 17 grid points are spaced on the X axis at equal intervals (equidistantly) in a range of
0 ... 100 %. The 100% value of the X axis refers to the current value (max. motor current in the
process) set in object 0x2C05 (or 0x3405 for axis B).
• The Y values for the grid points can be accessed via the subindices of object 0x2C04 (or 0x3404
for axis B).
[5-2] Saturation characteristic: Distribution of the grid points
• The 100 % value of a grid point refers to
• the set motor stator leakage inductance ( 0x2C01:3 or 0x3401:3 for axis B)
and
• the set current controller gain Vp ( 0x2942:1 or 0x3142:1 for axis B).
• Preferably select a display area of the grid points which includes at least the ultimate motor
current. The current controller step response is then recorded actively only until the grid point
with peak motor current. In order to prevent the motor winding from being overloaded, the
manual test mode "current pulse" should be used for recording. The grid points with current
setpoints above the peak motor current are determined through interpolation.
• When the saturation characteristics for motor types are determined, it makes sense in some
cases to select a scaled representation of the grid point distribution. This requires to know the
highest value of the quotient from "ultimate motor current / rated motor current" of the motor
series.

Note!
The saturation characteristic is not only used to correct the current controller, but it also
influences the current controller feedforward control (can be activated via object
0x2941 or 0x3141 for axis B).
0 6.25 12.5 18.75 25 31.25 37.5 43.75 50 56.25 62.5 68.75 75 81.25 87.5 93.75 100
I
max
Vp
Tn [V/A]
[ms]
[%]
x2 x3 x4 x5 x6 x7 x8 x9 x10 x11 x12 x13 x14 x15 x16 x17 x1