Baldor BXII installation manual Eliminating steady-state errors

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5.7 Eliminating steady-state errors

In systems where precise positioning accuracy is required, it is often necessary to position within one encoder count. The proportional gain, KPROP, is not normally able to achieve this because a very small following error will only produce a small demand for the drive which may not be enough to overcome mechanical friction (this is particularly true in current controlled systems). This error can be overcome by applying integral gain.

The integral gain, KINT, works by accumulating following error over time to produce a demand sufficient to move the motor into the required position with zero following error. KINT can therefore overcome errors caused by gravitational effects such as vertically moving linear tables. With current controlled drives a non-zero demand output is required to hold the load in the correct position, to achieve zero following error.

Care is required when setting KINT since a high value will cause instability during moves. A typical value for KINT would be 0.1. The effect of KINT should also be limited by setting the integration limit, KINTLIMIT, to the smallest possible value that is sufficient to overcome friction or static loads, for example 5. This will limit the contribution of the integral term to 5% of the full DAC output range.

1.Click in the KINT box and enter a small starting value, for example 0.1.

2.Click in the KINTLIMIT box and enter a value of 5.

With NextMove BXII, the action of KINT and KINTLIMIT can be set to operate in various modes:

HNever - the KINT term is never applied

HAlways - the KINT term is always applied

HSmart - the KINT term is only applied when the demand is zero or constant.

This function can be selected using the KINTMODE drop down box.

MN1904

Operation 5-19

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Contents NextMove Bxii Motion Controller Page Contents Operation Appendices Iv Contents MN1904 General Information Precautions Safety NoticeNextMove Bxii features Identifying the catalog number InstalledReceiving and inspection Units and abbreviations PhaseIntroduction MN1904 PC Hardware requirements Power sourcesIntroduction Tools and miscellaneous hardware Other information needed for installationMechanical installation and location requirements Mounting the NextMove Bxii This completes the basic installationConnector locations top panel X8 Power Connector locations front panelPower Power connectionsAnalog inputs Analog I/OAnalog input circuit, AIN0/AIN1 pair shown Analog output circuit Demand0 shown Analog outputs DemandsDigital I/O Pin Name Mint keyword / description Digital inputsINX.0 Digital input circuit fast interrupts Digital inputs InterruptsDigital output circuit Digital outputsEncoder interfaces X9, X10, X11, X12 Other I/OEncoder input frequency Relay connections Relay and user power4 RS232 RS232 serial port connections Cable wiring if hardware handshaking is not required Connecting Baldor HMI Operator Panels6 RS422 / RS485 RS422 / RS485 connections on a 9-pin male D-type connectorWire RS485 multi-drop connections Typical can network connections Can connectors X16Baldor can CANopenSystem watchdog Reset statesServo amplifier axis Connection summary minimum system wiringMinimum system wiring connections Preliminary checks Connecting the NextMove Bxii to the PCInstalling the software Starting the NextMove BxiiPower on checks Help file WorkBenchStarting WorkBench MN1904 Operation Selecting a scale Configuring an axisSetting the drive enable output Testing the drive enable output Testing the drive command output Testing and tuningSTOP.0 An introduction to closed loop control Summary, the following rules can be used as a guide NextMove Bxii servo loop Selecting servo loop gains Tuning an axis for current controlMN1904 Operation Underdamped response Underdamped responseKprop Overdamped responseCritically damped ideal response Critically damped responseEliminating steady-state errors Calculating Kvelff Tuning an axis for velocity controlKvelff Correct value of Kvelff Click Go Adjusting KpropCorrect value of Kprop Digital input configuration Digital input/output configurationDigital output configuration Toolbox, click the Edit & Debug icon Saving setup informationLoading saved information SupportMet feature Problem diagnosisStatus display NextMove Bxii indicatorsMN1904 Troubleshooting Motor control Symptom CheckCommunication Axis LED is red or Status LED shows a flashing symbolTroubleshooting MN1904 Description Input powerDigital inputs X1 Can interfaces X16 Relay outputEncoder interfaces X9 10Environmental 11Weights and dimensionsBaldor can nodes Catalog number Description OPT008-501 Encoder Splitter/Buffer boardIndex Index MN1904 MN1904 Index Index MN1904 Comments Comments MN1904 Page LT0158A01

BXII specifications

The Baldor BXII is a robust and versatile industrial motor known for its high performance and reliability in various applications. Designed for use in demanding environments, the BXII series is particularly favored in the food processing, petrochemical, and material handling industries. Its construction and technological features distinctly differentiate it from other motors in the market, enhancing efficiency and durability.

One of the standout features of the Baldor BXII is its premium efficiency rating, which ensures that the motor operates with minimal energy loss. This efficiency is crucial for industries looking to reduce energy costs and lower environmental impact. The BXII motor meets or exceeds NEMA Premium Efficiency standards, making it an eco-friendly choice for operations requiring continuous power.

Another important characteristic of the BXII series is its advanced design, featuring a high-quality aluminum frame that promotes excellent heat dissipation. This construction enhances the lifespan of the motor and reduces the risk of overheating during extended operation. Additionally, the BXII is equipped with an IP55-rated enclosure, ensuring that it is well-protected against dust and moisture, which is vital for reliability in harsh environments.

The Baldor BXII incorporates state-of-the-art technology in its motor design, including an innovative rotor design that offers optimal torque characteristics. This carefully engineered rotor ensures smooth operation and minimal vibration, resulting in increased performance and reduced wear on mechanical components.

Moreover, the BXII series employs a continuous duty service factor, allowing for longer operational hours without overheating or compromising performance. This is particularly beneficial for applications requiring consistent power output over extended periods.

The integration of smart technologies in the BXII line also enhances its usability. Features such as thermal protection and vibration sensors enable proactive monitoring of motor health, leading to preemptive maintenance that reduces downtime and extends the life of the motor.

Overall, the Baldor BXII offers a winning combination of efficiency, durability, and advanced technology, making it a reliable choice for industrial applications. Its commitment to performance and innovation underscores Baldor's reputation as a leader in the manufacturing of high-quality motors, ensuring that businesses can operate with confidence and efficiency. Whether in a food processing facility or a manufacturing plant, the BXII series stands out as an exemplary choice for those seeking dependable motor solutions.
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