Sourcetronic ST600 - Page 138

Frequency Inverter ST600 Series High-Performance Multifunction VFD Basic Operation Instructions
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V
Traction
Winding in torque mode
Unwinding in torque mode
In some special situations, if the roll diameter can be counted through thickness, the following
applications can be implemented:
Unwinding in speed mode Winding in torque mode
V
V
Unwinding in torque mode Winding in speed mode
5.5.20.2 Speed control
The detection feedback signal is needed in the closed-loop adjustment. PID calculation is carried out
according to the feedback signal for the motor speed regulation, linear speed and stable tension
control. If the tension rocker or floating roller is used for feedback, changing the set value (PID
reference) may change the actual tension, and at the same time, changing the mechanical
configuration such as the tension rocker or floating roller weight can also change the tension.
The control principle is as follows.
Calculate the frequency
according to the linear
speed
PID regulation
+
+
Linear speed
Tension reference
Tension feedback
Basic reference frequency
Inching
frequency
Motor reference
frequency
+
-