ABB COM0002 2RAA005844A0005H Analog quantity module

The nominal speed value can be fed through the input differential amplifier. In the stage connected on load side the positive and negative set values are suppressed separately (limit switch logic). The speed set value, conditioned by this way, is then injected to the speed controller. The inverted tachometer voltage, injected to the speed controller, in this device, is gained from the resolver signals, by means of a corresponding procedure. The current set value is then available at the output of the speed controller.

There are different possibilities to limit the nominal current: 

The I 2t current limiting reduces the current set value, using the following procedure: The actual current values are rectified, quadrated and run to a low pass. The circuit limits the current to the continuous current value, which corresponds to the position of the potentiometer P5, when the output voltage of the low pass reaches the voltage, adjusted at this potentiometer. Furthermore, the maximum possible nominal current can be adjusted to 0...15A, 0...25A or 0...18A with an externally fed voltage of 0...10V at the input Iext.

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