Frequency Inverter ST600 Series High-Performance Multifunction VFD Basic Operation Instructions
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(3) Real-time roll diameter calculation module: The calculation accuracy of roll diameter determines
the control performance. The roll diameter can be calculated according to the VFD output frequency
and the linear speed. In addition, it can also be calculated through the thickness or sensor. The linear
speed is widely used for the calculation. If the set linear speed is used for the calculation, you you
choose whether to enable the function of roll diameter change limiting.
(4) Torque compensation module: Torque compensation includes friction torque compensation and
inertia torque compensation. Friction torque compensation is used to eliminate the impact of friction
on tension, and it needs to be adjusted according to actual requirements. rRotation inertia includes
inertial of mechanical systems and that of materials. In order to keep the tension stable in ACC/DEC,
compensation torque is required. In some cases without strict tension control requirements, disabling
rotation inertia torque compensation can also achieve the control.
(5) Material feeding interrupt detection and processing module: The function is valid when material
feeding interrupt detection has been enabled.
(6) This function is applied to automatic reel change. After the VFD is started if the pre-drive function
terminal is valid, the roller runs at the set linear speed. When the terminal is invalid, the VFD will
automatically switch to the corresponding control mode after a period of time.
5.5.20.4 Closed-loop torque mode
Similar to the open-loop torque mode, the closed-loop torque mode has only the difference that tension
detection sensors are installed on the winding/unwinding side. In addition to all the function modules
supported in open-loop torque mode, this mode supports an additional tension feedback PID closed-
loop regulation module. The control principle is shown in the following figure.
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