Commissioning
different speed ranges. Above the Switch-Over threshold the parameters Amplification 2 (|f|>P738)
723 and Integral Time 2 (|f|>P738) 724 are effective for the speed controller.
Comply with chapter 7.9.5.3.
In different applications the Acceleration Pre-Control can enhance additionally the dynamic behavior,
please comply with the notes in chapter 7.9.5.4.
Depending on the application (inverter power, motor power, gear power, driven load)
and its load the frequency inverter might not be able to supply physically the requested
power. In this case the dynamic
behavior has to be adjusted to the environmental co
n-
ditions or the project planning has to be checked.
6.2.10.3 Voltage Constant
After the Setup was completed including the motor tuning, the Voltage constant can be changed
manually. If the Voltage Constant is not set optimum, the result might be a jerky or oscillating behav-
ior at approx. 5 % of the rated frequency (transition from starting current impression to Field Oriented
Control, the exact transition point is defined via
Frequency limit 624).
Proceed with the Optimization of the Voltage Constant as follows:
• Rotate the motor at approx 50 % of the rated speed without load.
• Check the Actual value
Rotor flux 225.
• Change the
Voltage constant 383 until the Rotor flux 225 equals 101 %.
With Motors with a high pole pair number it can occur, that the Voltage constant cannot
be entered in the valid value range up to 6500.00 mVmin. In this case you can enter
the value with factor 10 smaller. In the device the ratio input voltage/rated speed is
validated and the factor 10 is corrected automatically (if necessary).
Comply with chapter 7.2.2 “Further motor parameters”.
6.2.10.4 Insufficient Torque during Start of FOC and SYNCH
In the sensorless control the motor rotation is controlled below the Frequency limit 624 via a current
impression with
Starting current 623. Both parameters are set up during the Autotuning. Frequency
limit
624 is set to approx. 5 % of the Rated frequency. The value can be reduced in most applica-
tions. Bonfiglioli Vectron recommends to set up the
Frequency limit 624 always > 2.5 % of the rated
frequency and at least 1 Hz. Check your changes via the Scope function.
Starting current 623 affects the Torque during the Start. If the Torque during the Start should be
increased, increase
Starting current 623.
WARNING
Please note, that a continous operation with a high Starting current can overload the
motor thermally and eventually even destruct the motor. Always check the thermal sta-
bility of the motor after increasing the Starting current.
Comply with chapter 7.3.2 “Starting behavior”.
6.2.10.5 Cross coupling compensation
Using permanent excited synchronous motors can require a cross coupling compensation in individual
cases for high stator frequencies. This is typically necessary if changes in the speed controller do not
result in further improvements in the control behavior and the control behavior shows small oscilla-
tions at high stator frequencies.
• Rotate the motor at approx 66 % of the rated speed without load.
73
First commissioning 06/2013 Operating Instructions
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