Lenze i700 - Manual (Page 118)

5 Motor control & motor settings
5.11 Setting control loops
118
Lenze · i700 servo inverter · Reference manual · DMS 1.5 EN · 03/2014 · TD05
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5.11.5 Setting the field controller (ASM)
For motors with great rotor time constants or small rotor resistances, very high gain factors are
calculated. Since the setting range of the field controller is limited to the double rated magnetising
current, the field control loop in the case of these motors tends to a two-point response when the
values calculated are entered.

Tip!
Starting from a calculated gain factor of approx. 1000 A/Vs, do not set the full value
anymore.
Example: Calculated value = 10000 A/Vs  setting = 3000 A/Vs
For the automatic calculation of the controller parameters, the "Field controller: Calculate controller
parameters" function is provided via object 0x2822 (or 0x3022 for axis B).
0x29C0 | 0x31C0 - Field controller: Parameter
Equations for calculating the gain and the reset time
Axis A Axis B Symbol Description Dimension unit
0x29C0:1 0x31C0:1 V
p
Field controller gain A/Vs
0x29C0:2 0x31C0:2 T
n
Field contr. reset time s
0x2C02:2 0x3402:2 L
h
Mutual motor inductance (ASM) H
0x2C02:1 0x3402:1 R
r
Motor rotor resistance (ASM) Ω
- - T
current
controller
Equivalent time constant of the current control loop
= 0.0005 s (500 μs)
s
- - T
r
Motor rotor time constant
- - K
path
Gain of the controlled path
- - L
r
Motor rotor inductance (ASM) H
V
p
1
4 R
r
T
Current controller
⋅ ⋅
---------------------------------------------------------- ≈ V
p
T
n
4 K
Distance
T
Current controller
⋅ ⋅
---------------------------------------------------------------------------
L
r
R
r
-----
4 L
h
T
Current controller
⋅ ⋅
---------------------------------------------------------- = =
 
 
 
 
 
T
n
T
r
L
r
R
r
----- = =
Sub. Name Lenze setting Data type
 1 Field controller: Gain 165.84 A/Vs UNSIGNED_32
 2 Field controller: Reset time 15.1 ms UNSIGNED_16
Subindex 1: Field controller: Gain
Setting range (min. value | unit | max. value) Lenze setting
0.00 A/Vs 50000.00 165.84 A/Vs
 Write access  CINH  OSC  P  RX  TX Scaling: 1/100 UNSIGNED_32