Chapter 5 Function parameter
153
which may reduce the control performance. Generally do not need to be modified.
Vector optimization
without PG mode
selection
Upper limiting
frequency for DPWM
switching
Only valid for V/F control. Synchronous modulation refers to that the carrier frequency
linearly change with the change of output frequency, in order to ensure the unchanged of
their ratio(carrier to noise ratio), generally it is used when the output frequency is higher, is
conducive to ensure the output voltage quality.
Under the lower output frequency (100Hz) mode, generally the synchronize modulation
is not required, because at the time the ratio of the carrier frequency to the output frequency
is relatively high, the asynchronous modulation has more obvious advantages.
When the operating frequency is higher than 85Hz, the synchronous modulation takes
effect, the fixed mode is the asynchronous modulation below the frequency.
PWM carrier
frequency
random depth
By setting Random PWM, the monotonous and shrill motor sound can become softer
and which helps reduce external electromagnetic interference. When Random PWM Depth is
set to 0, Random PWM will be invalid. It will get different results by adjusting different
Random PWM Depths,
About 1140V voltage setting, the voltage availability will be improved by adjust voltage
setting. Too lower value setting can lead to system instability. So it is not recommended to
revise it for users.
5-2-14.Extended parameter:FC.00-FC.02
Proportional linkage
coefficient
When proportional linkage coefficient is 0, proportional linkage function can not work.
According to the setting by proportional linkage, communication address of master
(F9.02) is set to 248, and communication address of slave is set to 1 to 247.
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