Goodrive350A series high-performance multifunction VFD
Basic operation guidelines
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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. If 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.
Calculate the torque
according to the tension
T=J*d
Ω/dt
+
+
Reference
tension
Rotational inertia of
mechanical system
Rotational inertia
of material
Basic reference
torque
Inertia compensation
torque
Motor reference
toque
+
+
Friction
compensation torque
+
+
PID regulation
Tension feedback
Reference
tension
+
-
Adjustment torque
+
