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83SR04C-E GJR2390200R1411 GJR2390211R45 module

Torque / Current Limitation function block consist of limitation circuits for torque and current references and gear backlash compensation. Current Limitations The limitation of armature current is based on fixed current limit parameters and on limits which are the function of the actual speed. There is a function block with given points of speed and maximum current on these points. Finally the current limit selection is based on a maximum/minimum selection of these two limitation sources.

Torque limits for the speed controller and the external torque reference chain are set by means of the parameters. The program takes care that these limits cannot exceed the final torque limits, which are based on the given armature current limit and flux reference. This ensures that, e.g. the speed controller does not ask for a larger torque than the current limits allow. The torque limitation outputs 12301...12306 are internally connected to torque reference chain and speed controller

Speed Dependant Current Limitation 

With the help of this function the load (motor´s shaft, coupling, gear box and load machine) or the motor itself (commutation problems at high speed) can be protected against overload. If the drive is used in the field weakening range, the torque produced is lower than in the base speed range. Because of this and together with the design criteria of the mechanics sometimes the current needs to be lowered to avoid damage. Some motors (most often at high speed motors) the current needs to be reduced depending on the speed because of their electrical design. Especially above the field weakening point the loading current needs to be reduced according to instructions of motor catalogue.The armature current limits are calculated for the torque limits by means of the flux reference in such a way that the nominal current of the motor with nominal flux gives nominal torque of the motor, scaling: 4000 = TN(motor). The final torque limits can be read out from signals TORQMAX2 (12305) and TORQMIN2 (12306).

In default condition the parameters

 _LIM_Nx are set to 4 times nominal current and _LIM_SPEED is set to 20000 = 100% speed to disable the function. The values of the parameters P2310 to P2314 don´t need to be in a specific order (e.g. not constantly increasing / decreasing, see above). Dependend on the function of the armature current over speed range the following steps should be applied: - specify the MAX_CURR_LIM_SPEED (2309) - set the ARM_CURR_LIM_N1 (2310); the converter will use this value for the speed range between zero speed and P2309; please keep in mind, that all other limitations have to be increased, if more than nominal motor current is demanded (scale: 4095 = nominal current of motor) - the speed range between the speed specified via P2309 and top speed (100% or 20000) is splitted into 4 even parts - set the ARM_CURR_LIM_N2 (2311); to a current value, needed at point 1/2 - do the same with the other pairs