PD009 Intermediate voltage
                Set Range：0.1—500.0V            Unit：0.1V                Factory Setting：15/27.5
This  parameter  is  set  for  an  intermediate  voltage  value  of  arbitrary  V/F  curve.  If  it  is  set
improperly, it will cause over-current or under-torque of the motor, or even tripping of the inverter.
When the intermediate frequency is increased the voltage will increase the output torque and at the
same time also the output current.  When changing  this parameter please pay attention to
monitoring the output current to avoid the inverter’s tripping due to over-current.
The factory setting of intermediate voltage for 220V class inverter is 15, while the factory setting
of intermediate voltage of 380V class inverter is 27.5.
This  set  value  of  intermediate  voltage  is  limited  by  the  set  value  of  max  voltage.    When  the
voltage is increasing to a certain value at intermediate frequency the torque compensation will lose
its function. When adjusting this parameter the output current of the inverter should be increased
from low to high slowly according to the load of machines until it meets the starting requirement.
Do  not  be  quick  to  increase  it  by  large  amplitude.  Otherwise  it  might  cause  the  tripping  of  the
inverter or the damage of the machines.