C2000 Ramp Control

Create ramp-up and ramp-down function

Description

Replace the existing DMC blocks with MCB blocks for improved usability and future compatibility. It is recommended that you use blocks from Control Algorithm Design (Motor Control Blockset). While these blocks are not one-to-one replacements, they enable you to achieve the same functionality.

C28x DMC libC28x DMC lib equivalent in MCB
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C2000 Inverse Park TransformationInverse Park Transform (Motor Control Blockset)
C2000 Park TransformationPark Transform (Motor Control Blockset)
C2000 PID ControllerPI Controller (Motor Control Blockset)
C2000 Ramp ControlPosition Generator (Motor Control Blockset)
C2000 Ramp GeneratorPosition Generator (Motor Control Blockset)
C2000 Space Vector GeneratorPWM Reference Generator (Motor Control Blockset)
C2000 Speed MeasurementSpeed Measurement (Motor Control Blockset)

This block implements a ramp-up and ramp-down function. The input is a target value and the outputs are the set point value (setpt) and a flag. The flag output is set to 7FFFFFFFh when the output setpt value reaches the input target value. The target and setpt values are signed 32-bit fixed-point numbers with Q values between 16 and 29. The flag is a long number.

The target value is compared with the setpt value. If they are not equal, the output setpt is adjusted up or down by a fixed step size (0.0000305).

If the fixed step size is relatively large compared to the target value, the output may oscillate around the target value.

  • C2000 Ramp Control block

Parameters

Maximum delay rate

Value that is multiplied by the sampling loop time period to determine the time delay for each ramp step. Valid values are integers greater than 0.

Minimum limit

Minimum allowable ramp value. If the input falls below this value, it will be saturated to this minimum. The smallest value you can enter is the minimum value that can be represented in fixed-point data format by the input and output blocks to which this Ramp Control block is connected in your model. If you enter a value below this minimum, an error occurs at the start of code generation or simulation. For example, if your input is in Q29 format, its minimum value is -4.

Maximum limit

Maximum allowable ramp value. If the input goes above this value, it will be reduced to this maximum. The largest value you can enter is the maximum value that can be represented in fixed-point data format by the input and output blocks to which this Ramp Control block is connected in your model. If you enter a value above this maximum, an error occurs at the start of code generation or simulation. For example, if your input is in Q29 format, its maximum value is 3.9999....