CHV100 Series Close Loop Vector Control Inverter
.98.
Figure 6.29 Reducing long-cycle oscillation diagram.
l
Reducing short-cycle oscillation
If the oscillation cycle is short and oscillation occurs with a cycle approximately the same
as the differential time setting, it means that the differential operation is strong. The
oscillation will be reduced as the differential time is shortened.
Figure 6.30 Reducing short-cycle oscillation diagram.
If oscillation cannot be reduced even by setting the differential time to 0, then either
lower the proportional gain or raise the PID primary delay time constant.
Function
Code
Name
Description
Setting
Range
Factory
Setting
P9.07
Sampling cycle (T) 0.01~100.00s
0.01~100.00
0.50s
P9.08
Bias limit
0.0~100.0%
0.0~100.0
0.0%
Sampling cycle T refers to the sampling cycle of feedback value. The PI regulator
calculates once in each sampling cycle. The bigger the sampling cycle, the slower the
response is.
Bias limit defines the maximum bias between the feedback and the preset. PID stops
operation when the bias is within this range. Setting this parameter correctly is helpful to
improve the system output accuracy and stability.
