Lenze i950

13.11.4 Manual "current pulse" test mode
The stator resistance and the stator inductance of the inverter must be adapted to the electri-
c
al characteriscs of the motor. For an experimental adjustment, the manual "Current pulse"
test mode can be used.
This test mode is provided for adjusng the current controller in the "Servo con-
tr
ol for synchronous motor/asynchronous motor" operang mode and is not
suitable for adjusng the Imax controller in the "V/f characterisc control (VFC)"
operang mode!
In the manual "Current pulse" test mode, setpoint step-changes are applied to the current
controller input subsequent to controller enable. The step responses must then either be
recorded using an oscilloscope and a clamp-on ammeter, or using the oscilloscope funcon of
the inverter. It is the objecve to opmise the two "Gain" and "Reset me" current controller
parameters by evaluang the step responses so that a speedy current characterisc is ach-
ieved, which, if possible, is free of harmonics.
In the case of motors with single pole windings, sasfactory results are possibly only achieved
with a curr
ent-dependent correcon of the current controller parameters. For this purpose, a
characterisc is stored in the inverter, which describes the current dependance of the stator
leakage inductance and which tracks the current controller gain.
Aer the inverter has been enabled, the synchronous motor makes a jerky com-
pensang movement if its pole posion does not correspond to the starng
angle.
The motor phase U is energized with a DC current the level of which is determined via the
f
ollowing equaon.
_ test2 *I [%]*
100%
rated
phase U
I
I =
In motor phases V and W, half of this DC current ows
(negave; from the motor).
_ , _ 0.5* 2 * [%]*
100%
rated
phase V W test
I
I I= -
The following parameters are relevant to the calculaon:
•
Manual t
est mode: setpoint current 40x2835:001
•
Motor rated current 40x6075
•
Read only: current phase U 0x2D83:002
•
Read only: current phase V 0x2D83:003
•
Read only: current phase W 0x2D83:004
Condions for the execuon
•
The mot
or must be parameterised completely.
•
The motor
ulisaon (I²xt) monitoring must be parameterised and switched to acve.
4Mot
or overload monitoring (i²*t) ^ 286
•
The motor must rotate freely.
•
The inverter is error-free and switched on.
•
The rotor of synchronous motors must be in the pole centre during the test. For some syn-
chronous motors, it might be required to align and lock the rotor in the pole centre.
•
Using the manual test mode "current/frequency" is useful for a one-me alignment of
the rotor with the following sengs:
R.m.s. value = 70 ... 100 %; frequency = 0 Hz; starng angle = 0°
4Manual "current/frequency" test mode ^ 302
•
Fixaon by means of the holding brake or the use of external xaon aids
Conguring the motor control
Tesng the motor control
Manual "curr
ent pulse" test mode
303