Lenze 8400 TopLine - Manual (Page 237)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
237
5 Motor control (MCTRL)
5.9 Servo control (SC)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Special cases may require further optimisation steps:

Tip!
In order to traverse a typical speed profile for optimisation of motor control, you can also
use the basic function " Manual jog " with appropriately adapted manual jog parameters if
this basic function is supported by the selected technology application. ( 625)
5.9.4.1 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:
Optimisation steps
1. Setting the current setpoint filter (band-stop filter) . ( 244)
• In order to suppress or damp (mechanical) resonant frequencies, a current setpoint filter is integrated in
the speed control loop which is switched off in the default setting but can be parameterised accordingly,
if required.
Then readjust the speed controller: Optimise speed controller . ( 238)
2. Adapting the max. acceleration change (jerk limitation) . ( 245)
3. Only with servo control for asynchronous motors (ASM):
Optimising the behaviour of the asynchronous motor in the field weakening range . ( 250)
(For synchronous motors, this function is in preparation)

Note!
An optimisation of the current controller should generally be carried out unless a power-
adapted standard asynchronous 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 [ ]
---------------- =