SV800/SV800A User Manual 5 Introduction of operation and running
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5.4 Inverter model, carrier frequency and control mode settings
The frequency inverter type, carrier frequency and control mode have important position in the
using of frequency inverter. This chapter mainly introduce those aspects of SV800 series
inverter.
5.4.1 The model setting and modification
Model parameters have been set correctly when the inverter is delivered from the factory. The
user can check and confirm from
U5-00
(inverter voltage level and power) with the inverter
nameplate. The model parameters can be set from the manufacturer's parameters after obtaining
authorization. Do not modify the manufacturer's parameters without authorization. The
manufacturer is not responsible for all problems caused by modifying the manufacturer's
parameters.
If the inverter needs to replace the main control board, it may be necessary to reset the inverter
model, perform bus voltage correction, motor selection, control mode confirmation and carrier
frequency setting. It may just need bus voltage correction and other parameters can be restored
to factory setting. If the debugging and application parameters have been set on the replaced
main control board, you need to use the upload and download function of the keyboard to copy
the relevant setting parameters to the new main control board. Detailed setting steps for model
settings can also be consulted from the inverter manufacturer.
Note: After modify the frequency inverter model, even though the set parameters are updated by
the upload download function, you must also perform self-learning and update the related
feature parameters of the motor and the inverter.
5.4.2 Carrier frequency setting and modification
Frequency inverter carrier frequency is the modulation carrier frequency of the PWM signal
which is the core parameter of the inverter output voltage. The SV800 series inverter algorithm
supports range from 1.0 kHz to 15.0 kHz of the carrier frequency. It has factory default carrier
frequency for each inverter with different power. If you need to increase the carrier frequency
according to the application requirements of the inverter, the actual carrier frequency of the
output voltage waveform is the set carrier frequency. As the carrier frequency increases, the heat
generation increases, so the inverter must be derated, otherwise it will overheat frequently and
alarm, may even damage the inverter.
In vector control, since the cycle of torque control must be synchronized with the carrier
frequency, the characteristics of torque control will also change slightly after the carrier
frequency changes, especially when the carrier frequency is set to less than 2.0kHz, the torque
control cycle will change to Long and result in poor torque control characteristics. So if torque
control is required, it is recommended that the carrier frequency be set to 6.0kHz.
Other carrier changes appropriately adjust the rated capacity of the inverter according to the loss
considerations. For the derating guidelines when carrier frequency changes, please refer to
"
2.1.5 Inverter heavy-load application and derating use
".
Note: When the carrier frequency of the inverter changes, the inverter parameters obtained by
self-learning need to be modified, so self-learning must be performed to complete the automatic
Summary of Contents for SV800 Series
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