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G2010 A 10.4ST operating screen

The Arm Cur Nom (1.01), Arm Cur Max (3.04), Torque Lim Pos (3.07) and Torque Lim Neg (3.08) parameters are the ones relevant to the current limitation functions. Arm Cur Nom (1.01) scales the power converter to motor rated current. All other current-dependent parameters are referenced to this parameter. Arm Cur Max (3.04) limits the current controller absolutely. Torque Lim Pos (3.07) and Torque Lim Neg (3.08) limit the reference value span. For the self-optimisation function, only the Arm Cur Nom (1.01) is relevant. The current controller is always optimised to 100 %, since the system will more usually be running in the machine's operating point than in overload. If you want to optimise to overload, then the Arm Cur Nom (1.01) must be temporarily set to overload, then optimized, and subsequently reset again.

(*) The particulars given here for Overload Time and Recovery Time are to be construed as examples only. The actual figures will depend on the overload withstand capabilities of the drive components (motor and power converter), and must be covered by the planning work.

Second current limitation 

The motor’s maximum armature current is limited by the Arm Cur Max (3.04) parameter. This absolute limitation is always active. Under this, a second current limitation function, Arm Cur Lim 2 (3.24), switched on and off by a binary signal, can be activated in the Curr Lim 2 Inv (9.17) parameter. This means it is possible to switch back and forth digitally between these two limitation functions. The digital inputs DI1 to DI4 are available as binary signals. With serial communication, this limitation function can also be switched over using Bits 11 to 15 of the Main Control Word. If the second current limitation function has been activated in parameter group 9 - Macro Adaptation, the value of the Arm Cur Max (3.04) parameter must be greater than the value of Arm Cur Lim 2 (3.24). In addition, the Torque Lim Pos (3.07) and Torque Lim Neg (3.08) parameters must to set in accordance with Arm Cur Max (3.04). The Arm Cur Max (3.04) parameter limits the current to the maximum permissible armature current. This limitation function is always active, even when the second current limitation function has not been parameterised, Curr Lim 2 Inv (9.17) = Macro depend or Disable or Arm Cur Lim 2 (3.24) is greater than the value of Arm Cur Max (3.04).