Lenze I95AE240F User Manual

13.6.5.2 Current controller
The current controller consists of a direct-axis current controller and a cross current controller
which ar
e both parameterised idencally. The direct-axis current controller controls the eld-
producing current (D current). The cross current controller controls the torque-producing cur-
rent (Q current).
For a servo control, the current controller should always be opmised if a motor
of another manuf
acturer with unknown motor data is used! For a V/f character-
isc control, the current controller only has to be opmised if voltage vector
control Acvate voltage vector control (Imin controller) is used, or if DC-injec-
on braking or the ying restart process is acvated.
Automacally calculated sengs for the current controller
If one of the values calculated exceeds the upper object limit, the value is limi-
t
ed to the limit value.
There is a coupling between the two control loops (direct-axis current controller, cross current
c
ontroller) which makes every actuaon of a controller occur as fault in the control loop of the
other controller. This coupling can be compensated by acvang the current controller feed-
forward control via object 0x2941.
For the automac
calculaon of the two controller parameters (gain and reset me), the
"Calc. current contr. param." funcon is provided via object 0x2822:013. The calculang func-
on is based on the stator resistance 0x2C01:002 and the stator leakage inductance
0x2C01:003. Thus, these motor parameters must be parameterised before, e. g. by entering
the data sheet values manually. Subsequently, the calculated controller parameters can be
opmised by means of an experimental adjustment. The procedure is described in the follow-
ing secon Manual "current pulse" test mode . ^ 281
Equaon for calculang the gain of the synchronous motor
=
ss
p
Totzeit
L
V
T
Equaon for calculang the reset me of the synchronous motor
=
ss
n
s
L
T
R
Parameter Symbol Descripon Dimension unit
0x2942:001 V
p
Current controller gain V/A
0x2C01:003 L
ss
Stator leakage inductance H
- T
Dead
me
Equivalent me constant for the
analog detecon and scanning =
0.00009375 s (93.75 µs)
s
0x2942:002 T
n
Current controller reset me s
0x2C01:002 R
s
Stator resistance (value at 20° C) Ω
Equaon for calculang the gain of the asynchronous motor
s× ×
= »
s ss
p
Totzeit Totzeit
L 2 L
V
T T
Conguring the motor control
Opons for opmising the control loops
Mot
or control sengs
243

Lenze I95AE240F Specifications

General

Brand	Lenze
Model	I95AE240F
Category	Inverter
Language	English