Sumitomo HF-320a Series - Braking Setting Functions; Conducting PID Control

F-45
6
• When the torque current is above the specified dead zone torque current, the frequency is reduced
(during operation) or increased (during DC braking).
• The drooping function is activated above the torque current set with .
• The amount of drooping varies depending on the amount of torque current.
The difference of the frequency after drooping can be calculated as follows.
Drooping speed
Drooping speed = Base frequency 
Note
xx (Torque current-)
Note: If the base frequency exceeds 100Hz, count it as 100Hz.
Control is exercised between the starting frequency () and the maximum frequency ().
6.15 Braking setting functions
 : Braking mode selection
 : Release frequency
 : Release time
 : Creeping frequency
 : Creeping time
6.16 Conducting PID control
 : PID control wait time
 : PID control
 : Proportional gain
 : Integral gain
 : Differential (D) gain
• Function
Using feedback signals (4 to 20mA, 0 to 10V) from a detector, process control can be exercised, for
example, to keep the airflow, amount of flow or pressure constant.