ABB 3EHL409352R0001 Logic control card

In torque-controlled mode a certain set point torque is set, which the servo drive generates in the motor. In this case only the current controller is activated, since the torque is proportional to the motor current. 5.2.5 Speed-controlled mode This mode of operation is used, if the motor speed is to be kept constant regardless of the acting load. The motor speed exactly follows the speed set by the set point management. The cycle time of the speed control loop for the servo drive ARS 2100 SE is twice the PWM period duration, thus typically 208,4 µs. However, it can also be set as an integer multiple of the current controller cycle time The speed controller is a PI controller with an internal resolution of 12 bits per rpm. In order to eliminate wind-up effects, the integrator function is stopped upon reaching subsidiary limitations

In speed-controlled mode only the current controller

 and the speed controller are active. In the case of setting via analogue set point inputs it is optionally possible to define a “safe zero”. If the analogue set point is within this range, the set point is then set to zero (“dead zone”). This can suppress interferences or offset drifts. The function of a dead zone can optionally be activated and deactivated and the width can be set. The set points of the speed as well as the actual position are generally determined from the encoder system inside the motor, which is also used for commutation. For the actual value feedback to the speed control any encoder interface may be selected (for example reference encoder or corresponding system at external incremental encoder input). The actual speed value for the speed controller is then fed back for example via the external incremental encoder input. The set point for the speed can also be set internally or can be derived from the data of an external encoder system (speed synchronisation via [X10] for speed controller)

Torque-limited speed control 

The ARS 2100 SE series servo drives support torque-limited speed-controlled operation with the following features:  Fast updating of the limit value, for example in 200 µs cycle  Addition of two sources of limitation (for example for servo control values) 5.2.7 Synchronization to the external clock signal The servo drives use sinusoidal constrained current operation. The cycle time is always bound to the PWM frequency. In order to synchronise the current control to the external clock signal (for example CANopen) the device has a corresponding PLL. Accordingly the cycle time varies within certain limits, to allow synchronisation to the external clock signal. For synchronisation to an external clock signal the user must enter the rated value of the synchronous cycle time.

Application industry

The products can be used in the following industries: power plant, paper making, steel, mining, rubber, water supply, cement, chemical industry, glass, printing

Textile, machinery, plastics, coatings, medicine, hospitals, food, hotels, scientific research institutions

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