Lenze 8400 TopLine - Manual (Page 251)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
251
5 Motor control (MCTRL)
5.9 Servo control (SC)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Field controller
The field controller is designed as a PI controller.
The gain Vp ( C00077 ) of the field controller can be calculated using the motor rotor time constant
and the equivalent time constant of the current-controlled motor:
If the rated data of the motor and the mass inertia of the drive system are known, we recommend
the following setting:
[5-18] Recommendation for the setting of the gain and the time constant of the field controller

Tip!
The motor rotor time constant depends on the motor rotor resistance, the magnetising
inductance, and the leakage inductance.
• For an optimal calculation, we recommend to select the motor from the motor catalogue
of the »Engineer« first if a Lenze motor is used.  Selecting a motor from the motor
catalogue in the »Engineer« ( 139)
• If a third party manufacturer's motor is used, motor parameter identification must be
carried out previously.  Automatic motor data identification ( 141)
Parameter Info Lenze setting
Value Unit
C00077 SC: Vp field controller 12.80
C00078 SC: Tn field controller 256.0 ms
V
PField
: Gain of the field controller ( C00077 )
T
R
: Motor rotor time constant ( C00083 )
T
Equivalent
: Motor equivalent time constant (approx. 2.5 ms)
a: Measure for damping (z. B. a = 2)
V
PField
: Gain of the field controller ( C00077 )
T
R
: Motor rotor time constant ( C00083 )
T
Equi
: Motor equivalent time constant
T
NField
: Time constant of the field controller ( C00078 )
V
PFeld
T
R
s [ ]
a
2
T
Replacement
ms [ ] ⋅
------------------------------------------------------
% [ ]
=
V
PFeld
T
R
s [ ]
4 T
Replacement
ms [ ] ⋅
---------------------------------------------------
T
R
s [ ]
0.01 s [ ]
------------------- =
≈
T
NFeld
ms [ ] T
R
ms [ ]
=