Functionality from firmware v2.03
Mode of functioning of the stall protection controller
The stall protection controller attempts to avoid the impermissible range (actual current value Imax in %). This is defined in advance in parameter P-0-0115 (ASM: stall protection loop, torque limit value). If a machining procedure exceeds the Imax value, the servo drive reduces the set speed (reduction to ≤ 0 is possible). The mode of functioning is illustrated in detail in the following practical examples 1 and 2. The procedure concerned is always a machining procedure on a milling machine. A tool penetrates solid material on reaching the speed setpoint:
Practical example 1
Machining procedure with an actual current value Imax of 90% | |
| The value of the stall protection controller is set to 90% in example 1. As the tool penetrates the solid material, you can see by the blue characteristic curve that the speed drops dramatically at this point. Result: The limitation of the current to 90% by the stall protection controller is therefore insufficient to maintain the set speed. |
Practical example 2
Machining procedure with an actual current value Imax of 100% | |
| The value of the stall protection controller is set to 100% in example 2. As the tool penetrates the solid material, you can see by the blue characteristic curve that more current is available at this point and that the speed does not drop as dramatically as in example 1. Result: The consequence of the limitation of the current to 100% by the stall protection controller is that the set speed can be maintained better. |
Key:
- Green characteristic curve: set speed
- Blue characteristic curve: actual speed
- Red characteristic curve: active current (maps the torque)
- Yellow characteristic curve: reactive current (maps the magnetization)