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Application Manual CDA3000
6 Control modes
Optimized setup
(1) Effective value of active current
(2) Active current after filter for IxR
(3) Control reference
(4) Voltage change by IxR
Figure 6.14 Scope recording with motorized load torque of 8 Nm on a 1.5 kW
asynchronous motor with holding brake and 120% current injec-
tion
Fazit: The active current in the optimum setup is lower by a
factor of 2.
Voltage Frequency Control
The response of the drive can be influenced by the setting of the voltage
frequency control parameters by means of interpolation points. If reso-
nance points or oscillation occurs in the drive, it can be “quietened” by
reducing the voltage in the calculated frequency range. The reduced volt-
age causes less current to be delivered to the drive. Conversely, pur-
posely increasing the voltage can deliver more current to the drive in
order to compensate for increased load torques, such as those caused by
the mechanism.
(1)
(2)
(3)
(4)
7.
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