Lenze 8400 - Manual (Page 206)

5 Motor control (MCTRL)
5.8 Sensorless control for synchronous motors (SLPSM)
206
Lenze · 8400 protec HighLine · Reference manual · DMS 3.0 EN · 03/2013 · TD05
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5.8.4.1 Optimise current controller
An optimisation of the current controller is sensible since the two control parameters gain ( C00075 )
and reset time ( C00076 ) depend on the required maximum current and the set switching
frequency.
• Gain and reset time can be calculated as per the following formulae:

Note!
An optimisation of the current controller should generally be carried out unless a power-
adapted standard motor is used or the motor has been selected from the motor
catalogue of the »Engineer«!
Parameter Info Lenze setting
Value Unit
C00075 Vp current controller 7.00 V/A
C00076 Ti current controller 10.61 ms
V
p
= Current controller gain ( C00075 )
T
i
= Current controller reset time ( C00076 )
L
ss
= Motor stator leakage inductance ( C00085 )
R
s
= Motor stator resistance ( C00084 )
T
E
= Equivalent time constant (= 500 μs)
V
p
L
ss
H [ ]
T
E
s [ ]
---------------- =
T
i
L
ss
H [ ]
R
s
Ω [ ]
---------------- =