Motor data and controller adjustments of the synchronous motor
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.6 - 19
7
Voltage output for HF applications
It is necessary for applications with high frequency to activate the double voltage output with bit 12 of nn.00.
Speed estimation
The speed estimate controller is calculated by writing on Fr.10 and cannot be changed. The speed estimate
controller estimates a speed from the currents of the motor model. Parameter nn.04 "time speed calculation"
determines the scan time of the speed estimate controller. This time should not be changed.
Parameter nn.05 "lter speed calculation " determines the smoothing time at the output of the controller. Oscil-
lations are reduced when the value is increased, but the drive becomes more non-dynamic.
At special applications the drive has to rotate only into oneway direction. The respective direction of rotation can
be locked with oP.40/ oP.41 "max. output val. for/rev" by writing the parameter value to "0" and thus the speed
estimation is limited. To limit the speed estimate controller see also chapter 7.5.2.4.3.
The general speed control settings can be adjusted according to chapter 7.7.1 "speed control".
Diagram of the controller structure for operation without encoder feedback, see chapter 7.6.4.
7.6.3.7 Operationwithsine-wavelter
For the operation with sine-wave lter it is necessary to lter the resonance frequency with a band-stop lter. The
resonance frequency of the sine-wave lter and the corresponding lter parameters can be determined with the tool
sine-wave lter exe (www.keb.de). The equivalent circuit data of the motor and sine-wave lter must be entered
in order to generate a parameter list. Then this parameter list must be loaded to the frequency inverter. The lter
parameters are stored in the fh parameter group.
The resonance frequency is ltered of the estimated currents with software lter, in order that there is no reaction.
The band-stop lter must be activated in nn.00 "motor model select" bit 10 (band-stop lter). Also it must be con-
trolled to the estimated currents nn.00 bit 6 (current control). The deviation controller should be switched on with
bit 11 of nn.00 in order to avoid possible effects on wrong estimation. The deviation controller adjusts the estimated
currents to the measured currents with the scan time of nn.12 "deviation control time". This time can be increased
in case of current oscillations.
The inverter current is mostly higher than the motor current because there is a current through the capacitor of
the sine-wave lter. The single-phase capacitor value must be entered in nn.13 "C-lter [UF]" in order to clear
this error.
The EMC adaptation must be deactivated with bit 7 of nn.00.
The increased current ripple and the capacitor current must be considered at the dimensioning of the inver-
ter!
The minimum inverter switching frequency must be greater or equal than the minimum switching frequency
of the sine-wave lter.
To Next Page
Loading...
Need help?
General
