NO.6 Detailed Function Description
27
[Note] The ex-factory value of 220V grade inverter is 15 while that of 380V grade is 28.
This parameter can set intermediate voltage values in any V/F curve. Improper setting may
cause motor overcurrent or insufficient torque and even inverter tripping. Augmenting
intermediate voltage may augment the output torque and the output current will increase at
the same time. When modifying this parameter, please monitor the output current so as to
avoid overcurrent and tripping of inverter.
Intermediate voltage setting value is limited by maximum voltage setting value. When
intermediate voltage increases to a certain value, the torque compensation may lose its utility.
When adjusting this parameter, slowly increase the output current of inverter from small to
large as per the mechanical load until it meets the startup requirements and do not improve
the current with large amplitude, otherwise inverter tripping or equipment damage may occur.
Figure 6-1 Common Curves and Setting Values
P010
Setting value
Unit
Ex-factory value
Alteration
Booster voltage of
low-frequency torque
0.1-380.0V
0.1V
*
╳
[Note] The ex-factory value of 220V grade inverter is 7.5 while that of 380V grade is 14.
This parameter sets the lowest startup voltage value in V/F curve. P010 setting value is
limited by voltage of maximum operating frequency. This parameter can compensate the
insufficient torque at low frequency, but the torque compensation shall not be too large and
shall be set from small to large slowly according to actual situations. Insufficient
compensation may cause insufficient torque when motor is at low frequency, while excessive
compensation may cause excessive torque and generate impact to machinery and even may
cause inverter tripping if severe.
V/F curves are determined by P006-P010. This manual supplies several common V/F curves
for reference, such as Figure 6-1. Specific curves shall be set as per mechanical load