ABB DSTA 145 57120001-HP Connection Unit

To limit the maximum voltage signal to your amplifier, the DMC-18x2 controller has a torque limit command, TL. This command sets the maximum voltage output of the controller and can be used to avoid excessive torque or speed when initially setting up a servo system. When operating an amplifier in torque mode, the voltage output of the controller will be directly related to the torque output of the motor. The user is responsible for determining this relationship using the documentation of the motor and amplifier. The torque limit can be set to a value that will limit the output torque of the motor.

When operating an amplifier in velocity or voltage mode

the voltage output of the controller will be directly related to the velocity of the motor. The user is responsible for determining this relationship using the documentation of the motor and amplifier. The torque limit can be set to a value that will limit the speed of the motor.If the motor runs away and creates a position error of 2000 counts, the motor amplifier will be disabled. Note: This function requires the AEN signal to be connected from the controller to the amplifier.

Once the correct polarity of the feedback loop 

has been determined, the torque limit should, in general, be increased to the default value of 9.99. The servo will not operate properly if the torque limit is below the normal operating range. See description of TL in the command reference. Step D. Connect the Motor Once the parameters have been set, connect the analog motor command signal (ACMD) to the amplifier input. To test the polarity of the feedback, command a move with the instruction: PR 1000Position relative 1000 counts BGXBegin motion on X axis When the polarity of the feedback is wrong, the motor will attempt to run away. The controller should disable the motor when the position error exceeds 2000 counts. If the motor runs away, the polarity of the loop must be inverted. 

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