Page 7.6 - 12 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Motor data and controller adjustments of the synchronous motor
For large synchronous motors, it leads to signicant mechanical vibration and thus to noise development during
measurement of the leakage inductance with motor rated current. Here it is reasonable to reduce the measu-
ring current to 10..30% of the rated current.
The measured inductance is depending on the current level (saturation effects)!
The same function as for inductance is used for the current offset detection. Thus the parameter also has in-
uence here on the current level.
Parameter Name Value range
Dr.67 Current for Ls/loff identication (default value = 100% of the rated motor
current)
0…250%
A reduction is not necessary for the asynchronous machine. No ux is build-up, thus there is also no movement.
The speed controller should be parameterized with small Kp-, Ki values before the motor can be accelerated.
The speed controller can be preset optimally if the motor mass-moment of inertia is known (see chapter 7.7.1.2).
Depending on the used motor the identication takes some minutes!
Automatic identication cannot be executed if a sine-wave lter is connected!
Identication at encoder operation can only be done with value 7: „automatic operation without rotation" or as
single identication as described in the following, because the motor model is not active.
7.6.3.3.2 Singleidentication
As far as possible single identications should not be used for the rst measurement of the motor adaption,
since invalid test reading can occur at false sequence of the identications.
Single identication can always be used if a complete automatic measurement was executed and only indivi-
dual parameters shall be identied. For example this can be a resistance measurement at rated-load operating
temperature.
Inductance (dr.48 = 2)
Measurement of dr.31"winding inductance" occurs with high-frequency AC current in standstill. The measure-
ment is started with dr.48 = 2. Measurement current is DSM rated current dr.23.
The frequency of the measurement signal is adjustable via bits 5... 7 in parameter dr.48.If the measurement
current cannot be reached with 1kHz, then the identication reduces the measuring frequency automatically.
Therefore the frequency value should not be changed.
The inductance value is automatically written in dr.31 after identication.
Default setting of the current controller parameters and EMC (dr.48 = 1)
The EMC can be roughly calculated from the entered motor data like rated current and rated torque. dr.48 = 1
„calculation of the EMC“ must be written for this.
EMC =
M
n
x 90
————
I
n
The current controller values are also roughly preset.
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