Operating Instructions ACU
11.2.5 Voltage Constant
In Configuration 5xx and 6xx for control of synchronous machines, the control behavior can be
improved for highly dynamic requirements by setting parameter Voltage Constant 383.
For the voltage constant, refer to the motor data sheet. In the motor data sheet, the value may be
indicated in
.
This value can be applied to parameter Voltage Constant 383.
If guided commissioning (Setup) is not used, the self-setup should be performed to improve the
drive behavior, especially for small speeds, via parameter SETUP Select 796. Select one of the
settings 10 … 14 for SETUP Select 796 .
During guided commissioning (via control panel and VPlus) of BONFIGLIOLI motors, the Voltage
Constant is preset.
In the case of non-BONFIGLIOLI motors, the voltage constant should be entered if known. If you
don't know the voltage constant, set Voltage Constant 383 to 0 mV before commissioning, to
enable automatic calculation and measurement.
The voltage constant should be optimized after the guided commissioning procedure: In no-load
operation, set 50% of the rated speed. Change the voltage constant in small steps until parameter
Rotor Flux 225 reads 101% (±0.5%).
In the case of motors with a very high number of pole pairs (e.g. higher than 20), it is
possible that the maximum setting range of the parameter is not sufficient. In this
case, divide the voltage constant by 10 and enter the value. The division by 10 is
considered internally.
11.2.6 Stator inductance
In Configuration 5xx for control of synchronous machines, the control behavior can be improved for
highly dynamic requirements by setting parameter Stator Inductance 384.
The Stator Inductance 384 is referred to the value between two motor phases and can typically be
applied directly from the motor data sheet.
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