Baldor 29M Installation And Operating Manual
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Contents
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Section 6Manually Tuning the Series 29M ControlManually Tuning the Series 29M Control 6-1MN1230Explanation of Closed Loop Block DiagramsControl systems are usually represented by a series of interconnected blocks. Theblocks represent the individual functions of the system. The blocks are interconnected bya series of lines, which represent the variable or quantity involved with directional arrowsshowing the direction of information flow. See Figure 6-1.Figure 6-1 Block Diagram of a Closed Loop System Summing Junction(error detector)Input Command(Desired Value)ErrorSignalOutput2134Power InputControlMeasuringMeansLoad DisturbanceControlledVariableControlled VariableFeedbackMotorAny closed loop system can be divided into four basic operations:1. Measurement of the controlled variable. The controlled variable can bevelocity, torque, etc. This measuring means is accomplished using a sensorthat converts the variable to an electrical signal that is compatible with thecontrol inputs, usually voltage or current. This signal now represents thecontrolled variable (Feedback).2. Determination of the error. The summing junction compares the measuredvalue of the controlled variable (Feedback Input) with the Input Command(desired value) and generates a error signal. The operation is a simplemathematical subtraction operation as follows:Error Signal ( ) = Input Command - Feedback3. The error signal is then used by the control to change the motor speed ortorque.4. The motor speed or torque is then used to reduce the error signal by driving thecontrol, and the final controlled variable, so that the actual value of thecontrolled variable approaches the Input Command value or desired value. Itshould be noted that closed loop control systems are error actuated. In otherwords, an error must be present before the system will try to correct for it.Definition of Input Command (Desired value)The Input Command is the input signal set by the operator. This can represent speed ortorque level.Definition of Feedback Feedback is the signal which represents the actual measured value from the controlledvariable. This can represent a pressure, flow, speed, torque, level or temperature sensor.This input is usually a sensor voltage or current representing the measured value.Definition of Error Error is the result of subtracting the Input Command and Feedback signals.Error is mathematically defined as:Error Signal ( ) = Input Command - Feedback |
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