The operating frequency is lower frequency. Start the motor that in the status of stopping,
the inverter outputs accelerate starting from 0Hz, accordance with the step 1 acceleration time
towards the upper or the setting frequency to accelerate.when motor Stop,the operating frequency
decelerate according to deceleration time down to 0Hz.
This function is chiefly used to improve the possible noise and vibration during the
operation of frequency converter. When carrier frequency is higher, the output current has better
wave, the torque is great at lower frequency and the motor produces light noise. So it is very
suitable for use in the applications where great torque is output at low frequency quietly. But in
these applications, the damage to the switches of main components and the heat generated by the
inverter are great, the efficiency is decreased and the output capacity is reduced. At the same
time, more serious radio interference is resulted and special attention must be paid for application
where very low EMI is needed, and filter option can be used if necessary. Another problem for
application of high carrier frequency is the increase of capacitance-leakage current. The protector
for leakage current may invalidate function, and over current is also possibly caused.
When low carrier frequency is applied, the case is almost contrary to the above-mentioned
one.
Different motor has different reflection to the carrier frequency. The best carrier frequency is
gained after regulation according to actual conditions. The higher the motor capacity is, the lower
the carrier frequency should be selected.
The company reserves the right to limit maximum carrier frequency as following:
The relation between carrier frequency and Motor Noise, Electric disturbance, Switch
dissipation is expressed as following:
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