KEB COMBIVERT F5-A, Applications Manual, Page: 212 / 552

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 significant 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-
fluence here on the current level.
Parameter Name Value range
Dr.67
Current for Ls/loff identification (default value = 100% of the rated motor
current)
0…250%
A reduction is not necessary for the asynchronous machine. No flux 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 identification takes some minutes!
Automatic identification cannot be executed if a sine-wave filter is connected!
Identification at encoder operation can only be done with value 7: „automatic operation without rotation" or as
single identification as described in the following, because the motor model is not active.
7.6.3.3.2 Single identification
As far as possible single identifications should not be used for the first measurement of the motor adaption,
since invalid test reading can occur at false sequence of the identifications.
Single identification can always be used if a complete automatic measurement was executed and only indivi
-
dual parameters shall be identified. 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 identification reduces the measuring frequency automatically.
Therefore the frequency value should not be changed.
The inductance value is automatically written in dr.31 after identification.
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.