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AC Adjustable Frequency Drives

Yaskawa AFD Programming & Configuration Guide: Parameters, Setup

· 17 min read

Technical Guide: Step-by-Step Setup Instructions for Motor Configuration, Control Modes, and System Commissioning

Yaskawa Adjustable Frequency Drives (AFDs), commonly called Variable Frequency Drives (VFDs) or AC drives, do far more than vary motor speed. Properly configured, a Yaskawa drive controls motor speed, torque, acceleration, deceleration, stopping behavior, current limits, protection functions, and communication with PLCs and other industrial automation systems.

Successful Yaskawa AFD programming comes down to four fundamentals: enter accurate motor data, select the correct control method, configure the command and frequency-reference sources correctly, and tune the drive to the actual machine. The most important parameters are not necessarily the most complicated ones; incorrect motor data, command-source settings, acceleration/deceleration values, or control-mode selection can produce poor motor performance, nuisance trips, overheating, or unexpected machine behavior. This guide explains the programming workflow, major Yaskawa parameter groups, motor setup, Auto-Tuning, speed and run-command configuration, PLC integration, troubleshooting, and practical commissioning techniques.

What Is a Yaskawa AFD?

A Yaskawa AFD is a power-electronic motor controller that regulates the frequency and voltage delivered to an AC motor. By changing output frequency, the drive changes motor speed. At the same time, the drive manages voltage, current, torque-producing current, slip compensation, and other control variables to produce the required motor response.

Yaskawa manufactures several AC-drive families for different applications. The GA500 is a compact general-purpose AC drive, while the A1000 was developed as a higher-performance vector-control platform. The programming concepts overlap, but the exact parameter numbers, available control modes, terminal functions, and menu structures depend on the drive family, firmware, motor type, and installed options.

That distinction matters.

A technician who knows an A1000 parameter from memory should not automatically enter that same number into a GA500. Yaskawa’s current GA500 documentation separates installation, primary operation, programming, and technical-reference information. The A1000 has its own parameter architecture and technical documentation.

Always identify the exact drive model before changing parameters.

For Automation Pioneer readers, Yaskawa drives are part of the larger industrial automation ecosystem alongside PLCs, HMIs, sensors, encoders, motion-control equipment, and other motor-control products.

Before Programming: Collect the Correct Motor and Application Data

The most common programming mistake is starting at the keypad before collecting the motor information.

Do not guess.

Before entering parameters, record the motor’s:

  • Rated voltage

  • Rated current

  • Rated frequency

  • Rated horsepower or kilowatt rating

  • Rated speed

  • Number of poles, where required

  • Motor connection configuration

  • Power factor, where required

  • Motor thermal characteristics

  • Encoder or feedback information, if applicable

  • Required operating speed range

  • Application load type

  • Acceleration and deceleration requirements

The motor nameplate is the starting point because the drive’s control algorithm needs accurate electrical characteristics to calculate the appropriate voltage, current, and torque behavior.

For a basic centrifugal fan, a simple V/f strategy may be sufficient. A conveyor carrying variable loads may benefit from open-loop vector control. A hoist, winder, or high-performance machine may require closed-loop vector control and encoder feedback.

The application should determine the programming strategy—not the other way around.

Motor Data Is Not Optional

If the drive is configured for vector control, incorrect motor data can significantly affect performance. A drive may still run the motor with incorrect values, but “it runs” is not the same thing as “it is correctly configured.”

Poor motor data can appear as:

  • Excessive current

  • Poor low-speed torque

  • Motor hunting

  • Unstable speed

  • Overcurrent during acceleration

  • Motor overheating

  • Poor braking response

  • Incorrect torque production

  • Failed or inaccurate Auto-Tuning

This is why professional Yaskawa AFD commissioning starts with documentation rather than experimentation.

Yaskawa AFD Parameter Architecture

Yaskawa drives organize parameters into functional groups. The exact structure varies by product family, but the principle is consistent: parameters are grouped according to initialization, command sources, acceleration/deceleration, inputs and outputs, motor characteristics, protection, communication, and application functions.

On the A1000, for example, commonly encountered groups include:

  • A parameters — initialization, access, and control-method configuration

  • b parameters — operation and command/reference settings

  • C parameters — acceleration/deceleration and timing functions

  • d parameters — reference and monitor-related functions

  • E parameters — motor and V/f characteristics

  • F parameters — digital input/output functions

  • H parameters — terminal and multifunction I/O configuration

  • L parameters — protection and fault-related functions

  • n parameters — advanced application/control functions

The exact parameter list must always be checked against the specific drive manual.

On the A1000, for example, A1-02 is used for Control Method Selection. The available options include V/f control and different vector-control strategies, depending on the motor and application.

The GA500 uses a different parameter implementation even though many commissioning concepts are similar.

Why Parameter Identification Matters

Do not treat Yaskawa parameter numbers as universal.

The same engineering function may have a different parameter number, setting range, or available option between drive families.

Before changing a parameter, verify:

  1. Drive family

  2. Drive model

  3. Software/firmware revision where relevant

  4. Motor type

  5. Control mode

  6. Applicable manual

  7. Parameter description

  8. Permitted setting range

That discipline prevents one of the most avoidable commissioning errors: applying a technically correct setting from the wrong Yaskawa manual.

The Most Important Yaskawa AFD Programming Parameters

Although a complete parameter list can contain hundreds of settings, most basic commissioning tasks revolve around a smaller group of functions.

Control Method Selection

The control method determines how the drive regulates the motor.

On the A1000, A1-02 selects the control method. Yaskawa documents options including V/f control, open-loop vector control, closed-loop vector control, and control methods for permanent-magnet motors.

The practical distinction is important.

V/f control is appropriate for many straightforward speed-control applications where advanced torque regulation is not required.

Open-loop vector control provides more sophisticated speed and torque control without requiring conventional motor-speed feedback.

Closed-loop vector control uses feedback and is intended for applications demanding substantially greater speed or torque-control performance.

Do not select a control mode simply because it sounds more advanced. Select the mode that matches the motor, application, feedback hardware, and required performance.

Frequency Reference Selection

The drive must know where its speed command originates.

Typical sources include:

  • Keypad/operator

  • Analog input

  • Digital preset speeds

  • PLC

  • Communication network

  • External potentiometer

  • Application controller

On the A1000, b1-01 is associated with Frequency Reference Selection 1.

During initial commissioning, keypad control is often useful because it removes external control logic from the equation. Once the motor operates correctly from the keypad, the engineer can introduce PLC commands, analog references, or network control.

That makes troubleshooting considerably easier.

Run Command Selection

The drive also needs to know where the Start/Stop command originates.

On the A1000, b1-02 is associated with Run Command Selection 1.

A common mistake is having the correct frequency reference but the wrong run-command source. The technician changes the frequency reference, but the motor does not start because the drive is waiting for a run signal from an external terminal or network.

When a Yaskawa drive “will not run,” check the command source before assuming the drive has failed.

Stopping Method

Stopping behavior is configured separately from starting behavior.

On the A1000, b1-03 is associated with Stopping Method Selection.

The correct stopping method depends on the mechanical system.

A heavily loaded conveyor, fan, pump, spindle, or high-inertia rotating assembly does not behave the same way when the motor is commanded to stop. If the deceleration ramp is too aggressive, the motor can regenerate energy into the drive’s DC bus and cause an overvoltage condition.

Acceleration and Deceleration

Acceleration and deceleration parameters determine how quickly the motor changes speed.

For A1000 systems, C1-01 is the standard Acceleration Time 1 parameter, with related C1 parameters providing additional ramp settings.

For example, if a motor is commanded from 0 Hz to 60 Hz with a 10-second acceleration time, the drive establishes a controlled frequency ramp instead of attempting to reach 60 Hz immediately.

However, shorter is not automatically better.

An acceleration time that is too short can cause:

  • Overcurrent

  • Acceleration failure

  • Mechanical shock

  • Belt or coupling stress

  • Excessive torque demand

  • Drive thermal stress

Likewise, a deceleration time that is too short can cause:

  • DC-bus overvoltage

  • Overvoltage trips

  • Mechanical shock

  • Braking resistor overload

The correct values come from the machine’s mechanical requirements and the drive’s capabilities.

V/f Parameters and Motor Voltage/Frequency Configuration

V/f operation relies on a defined relationship between output voltage and frequency.

On the A1000, E1-01 is Input Voltage Setting, E1-03 is V/f Pattern Selection, E1-04 is Maximum Output Frequency, E1-05 is Maximum Voltage, and E1-06 is Base Frequency.

These settings are fundamental to conventional V/f motor control.

Maximum Output Frequency

Maximum frequency establishes the upper operating limit for drive output frequency under the applicable configuration.

Do not assume that increasing maximum frequency is harmless. Motor speed, bearings, mechanical balance, cooling, driven equipment, and process requirements all impose limits.

Base Frequency

Base frequency is particularly important because it represents the point around which the motor reaches its rated voltage/frequency relationship.

For a typical motor rated 460 V at 60 Hz, the fundamental operating relationship is based around 460 V and 60 Hz.

Above base frequency, the motor generally enters a field-weakening region where available torque characteristics change.

That is why commanding 100 Hz does not mean the motor will produce twice its rated torque.

Motor Control Modes: V/f vs. Vector Control

Choosing the control method is one of the most consequential programming decisions.

V/f Control

V/f control is comparatively simple and works well for many pumps, fans, and general-purpose motor applications.

It is particularly useful when:

  • Precise speed regulation is not critical

  • Multiple motors share one drive

  • Motor parameters are incomplete

  • The application has relatively simple torque requirements

The tradeoff is reduced dynamic performance compared with vector-control strategies.

Open-Loop Vector Control

Open-loop vector control is commonly selected when an application needs better torque response and speed regulation without conventional encoder feedback.

Yaskawa’s A1000 documentation identifies open-loop vector control for applications requiring improved speed control, torque response, and low-speed torque compared with basic V/f operation.

For many industrial machines, it provides a practical middle ground between basic scalar control and closed-loop systems.

Closed-Loop Vector Control

Closed-loop vector control adds speed feedback and is used when the application requires highly precise speed or torque control.

Applications can include:

  • Hoists

  • Winders

  • Unwinders

  • Certain machine tools

  • High-performance conveyors

  • Applications requiring controlled low-speed operation

The encoder and feedback system must be correctly configured. A sophisticated control algorithm cannot compensate for incorrect encoder wiring or incorrect feedback parameters.

Yaskawa AFD Auto-Tuning

Auto-Tuning is one of the most useful commissioning functions on a Yaskawa drive, particularly when vector control is being used.

Yaskawa’s A1000 documentation includes rotational Auto-Tuning as part of the initial commissioning process, and Yaskawa provides Auto-Tune procedures for the GA500 platform as well.

Auto-Tuning allows the drive to identify motor characteristics required by its control algorithm.

Before running Auto-Tuning:

  1. Verify the motor nameplate data.

  2. Verify the motor wiring.

  3. Verify the motor connection configuration.

  4. Confirm that the machine can safely rotate if rotational tuning is required.

  5. Remove mechanical constraints where appropriate.

  6. Confirm that personnel are clear of rotating machinery.

  7. Verify emergency-stop and machine safety functions.

  8. Select the correct tuning method.

  9. Follow the exact procedure for the specific drive.

Do not treat Auto-Tuning as a magic “fix motor performance” function.

If the motor data is wrong, or the mechanical system is unsuitable for the selected tuning procedure, the tuning results may be wrong.

Rotational vs. Non-Rotational Tuning

The correct Auto-Tuning method depends on the application.

Rotational tuning provides the drive with an opportunity to characterize the motor under operating conditions that involve rotation. Non-rotational methods are useful where the motor cannot safely rotate during commissioning.

The correct procedure is therefore determined by the drive documentation and application constraints.

Keypad Programming and Initial Commissioning

For a new installation, establish a known-good baseline before introducing external automation.

Start with the motor disconnected from the process where practical, or place the machine into a controlled commissioning condition.

Step 1: Verify Wiring

Check incoming power, motor output connections, grounding, control wiring, and feedback wiring.

Never treat drive output terminals as ordinary line-voltage switching points. The drive generates a controlled waveform for the motor.

Step 2: Enter Motor Data

Enter the motor’s nameplate values exactly as required by the drive.

Step 3: Select Control Mode

Choose V/f, open-loop vector, closed-loop vector, or the appropriate PM-motor mode.

Step 4: Configure Command Source

Determine whether Start/Stop comes from the keypad, digital inputs, PLC, or communication network.

Step 5: Configure Speed Reference

Select keypad, analog input, preset speed, PLC, or network control.

Step 6: Set Acceleration and Deceleration

Start conservatively and optimize the ramp after stable operation has been confirmed.

Step 7: Perform Auto-Tuning

Perform the appropriate tuning procedure when required.

Step 8: Verify Rotation

Run the motor at low speed first.

If the rotation direction is incorrect, stop the drive and correct the motor phase sequence using the manufacturer’s procedure and applicable electrical-safety requirements.

Step 9: Test Across the Operating Range

Do not test only at 60 Hz.

Check low-speed behavior, normal operating speed, acceleration, deceleration, current, motor temperature, and load response.

Configuring a Yaskawa AFD for PLC Control

Once local operation is confirmed, integrate the drive into the PLC system.

A common architecture is:

PLC → Run Command → Yaskawa AFD → Motor

and:

PLC → Speed Reference → Yaskawa AFD → Motor

The PLC may send a digital run command and analog speed reference, or both command and reference may travel through an industrial communication network.

The drive should provide useful status information back to the PLC, such as:

  • Running

  • At speed

  • Faulted

  • Ready

  • Direction

  • Output frequency

  • Output current

  • Fault code

The exact I/O mapping depends on the drive family and control architecture.

For broader automation integration, Automation Pioneer also provides PLC and controller products categories and HMI, networking, instrumentation, and motor-control resources.

Analog Speed Reference Configuration

Analog control remains common in industrial installations.

A PLC may generate a 0–10 V or 4–20 mA signal representing the desired speed.

The engineering challenge is not simply wiring the signal. The drive must correctly interpret:

  • Signal type

  • Minimum reference

  • Maximum reference

  • Scaling

  • Bias

  • Filtering

  • Signal-loss behavior

For example, a 4–20 mA signal might represent 0–60 Hz, but another machine could configure the same signal to represent 30–60 Hz.

Always document the relationship between the process variable, PLC output, analog signal, drive reference, and motor speed.

Digital Inputs and Preset Speeds

Yaskawa drives can also use multifunction digital inputs for commands and preset-speed functions.

This is useful when a machine has fixed operating points.

For example:

  • Speed 1 = 20 Hz

  • Speed 2 = 35 Hz

  • Speed 3 = 50 Hz

  • Speed 4 = 60 Hz

The PLC or machine controller can select the appropriate digital-input combination.

This approach is simple and deterministic for applications requiring several predefined speeds.

Yaskawa AFD Communication and Network Control

Modern Yaskawa drives can be integrated into industrial networks.

Depending on the drive family and option hardware, supported communications can include protocols such as Modbus and EtherNet/IP. Yaskawa provides network support files and documentation for multiple drive families.

Network control introduces another layer of commissioning.

The engineer must verify:

  • Node/address configuration

  • Network topology

  • PLC data mapping

  • Command-word structure

  • Frequency-reference data

  • Status-word interpretation

  • Fault handling

  • Communication-loss behavior

A drive can be electrically perfect and still refuse to run because the PLC is sending an incorrect command word.

This is why network commissioning should occur after local drive operation has been proven.

Common Yaskawa AFD Programming Problems

Drive Will Not Start

Check the following in order:

  1. Is the drive faulted?

  2. Is the run-command source correct?

  3. Is a digital input preventing operation?

  4. Is the frequency-reference source correct?

  5. Is the frequency reference above the minimum threshold?

  6. Is an external interlock active?

  7. Is the PLC sending the expected command?

  8. Is the drive receiving valid network data?

Do not immediately reset the drive.

Find out why it did not start.

Motor Runs but Draws Excessive Current

Check:

  • Motor nameplate data

  • Motor connection

  • Control mode

  • Auto-Tuning

  • Mechanical load

  • Acceleration time

  • Motor condition

  • Driven equipment

If the motor is mechanically overloaded, changing parameters may only mask the actual problem.

Motor Hunts or Runs Unsteadily

Check the control method first.

Then verify motor data and Auto-Tuning.

For vector applications, incorrect motor characteristics can seriously degrade performance.

Also determine whether the motor is appropriate for the selected control strategy and whether feedback hardware is functioning correctly.

Overvoltage During Deceleration

This is a classic high-inertia problem.

When the motor decelerates, the rotating load can drive energy back into the drive’s DC bus. If the regenerated energy exceeds the system’s ability to absorb or dissipate it, the DC-bus voltage rises and the drive can trip.

Possible solutions include:

  • Increase deceleration time

  • Review load inertia

  • Use appropriate braking equipment

  • Review regenerative requirements

  • Verify braking-resistor configuration

  • Review the stopping strategy

Overcurrent During Acceleration

Check acceleration time, load inertia, motor data, mechanical binding, motor wiring, control method, and motor condition.

Do not simply increase current limits until the fault disappears.

A protection function is telling you that something in the electrical or mechanical system requires attention.

How to Program a Yaskawa AFD for a Conveyor

Consider a conveyor driven by a standard three-phase induction motor.

First, record the motor nameplate data and determine the required conveyor speed. Next, select an appropriate control mode.

For a straightforward conveyor, V/f may be sufficient. If the conveyor requires better low-speed torque and speed regulation, open-loop vector control may be more appropriate.

Enter the motor data, select the command source, select the speed reference, establish acceleration and deceleration ramps, and perform Auto-Tuning where required.

Then operate the conveyor without product.

Verify rotation.

Next, run it with a small load.

Finally, test it at normal production load while observing motor current, speed stability, acceleration, stopping, and fault behavior.

The objective is not merely to make the conveyor move. The objective is repeatable operation under the actual production load.

How to Program a Yaskawa AFD for a Pump or Fan

Pump and fan applications are different because their torque requirements vary substantially with speed.

For centrifugal equipment, reducing motor speed can provide significant energy savings because the affinity-law relationship between speed and flow, head, and power makes variable-speed operation particularly valuable.

However, the drive still needs to be configured around the process.

Consider:

  • Minimum operating speed

  • Minimum pump flow

  • Cavitation

  • Fan surge

  • Process pressure

  • Acceleration time

  • Deceleration behavior

  • Motor cooling

  • Bypass requirements

  • Process-control requirements

A drive should be programmed around the process—not simply around the motor.

Parameter Backup and Documentation

Once the drive works correctly, document the configuration.

Record:

  • Drive model

  • Drive capacity

  • Firmware

  • Motor model

  • Motor nameplate information

  • Control mode

  • Parameter values

  • I/O assignments

  • Network settings

  • Auto-Tuning results

  • Application-specific settings

  • Protection settings

  • PLC mapping

Where supported, use the drive’s parameter backup functionality.

Parameter backup is particularly valuable when replacing a failed drive. Without a documented configuration, technicians may have to reconstruct the settings from memory or reverse-engineer the machine.

A good commissioning record turns troubleshooting from detective work into controlled restoration.

Yaskawa AFD Programming Best Practices

A professional commissioning process follows a repeatable sequence.

First, use the correct manual. Parameter numbers are not universal across every Yaskawa family.

Second, record the original configuration. Never change a production drive blindly.

Third, change one logical group at a time. If ten unrelated parameters are changed simultaneously, determining which change caused the behavior becomes difficult.

Fourth, establish a baseline. Test local control before introducing PLC or network control.

Fifth, validate under real load. No-load testing does not prove production performance.

Sixth, protect the machine. Acceleration, deceleration, torque limits, current limits, stopping methods, and interlocks should reflect the mechanical system.

Seventh, document everything. A parameter list without the engineering reason for the settings is incomplete documentation.

Yaskawa AFD Programming Checklist

Before declaring a drive commissioned, verify:

  • Correct drive model installed

  • Correct input voltage

  • Correct motor voltage

  • Correct motor current

  • Correct motor frequency

  • Correct motor power

  • Correct control method

  • Correct run-command source

  • Correct frequency-reference source

  • Correct acceleration time

  • Correct deceleration time

  • Correct maximum frequency

  • Correct minimum frequency

  • Auto-Tuning completed where required

  • Motor rotates correctly

  • No abnormal current

  • No nuisance faults

  • PLC communication verified

  • HMI commands verified

  • Fault handling verified

  • Emergency-stop strategy verified

  • Parameters backed up

  • Final parameter sheet documented

Frequently Asked Questions About Yaskawa AFD Programming

1. How do I program a Yaskawa AFD for the first time?

Start by identifying the exact drive model, recording the motor nameplate data, selecting the appropriate control mode, configuring the run command and frequency-reference sources, setting acceleration/deceleration values, and performing the applicable Auto-Tuning procedure.

2. What are the most important Yaskawa AFD parameters?

The most important parameters depend on the drive family, but commissioning normally centers on control method, run-command source, frequency-reference source, acceleration/deceleration, motor data, frequency limits, I/O functions, protection, and communication settings.

3. What is Yaskawa A1-02 used for?

On the A1000, A1-02 selects the control method. The available choices include V/f and vector-control strategies, along with motor-specific control modes.

4. What is Auto-Tuning on a Yaskawa drive?

Auto-Tuning allows the drive to identify motor characteristics needed by its control algorithm. The appropriate tuning method depends on the drive, motor, and application.

5. Why does my Yaskawa drive show a run command but the motor does not start?

Check the active run-command source, frequency-reference source, external interlocks, digital-input configuration, minimum frequency settings, fault status, and PLC or network command data.

6. Why does my Yaskawa AFD trip on overcurrent during acceleration?

Possible causes include insufficient acceleration time, excessive load inertia, incorrect motor data, incorrect motor wiring, mechanical binding, inappropriate control settings, or an overloaded motor.

7. Why does a Yaskawa drive trip on overvoltage during deceleration?

High-inertia loads can regenerate energy into the drive during deceleration. Increasing the deceleration time or using an appropriately engineered braking solution may address the condition.

8. Can a Yaskawa AFD be controlled by a PLC?

Yes. Yaskawa drives can be integrated with PLCs using hardwired digital/analog I/O or supported industrial communication interfaces.

9. Should I use V/f or vector control on a Yaskawa drive?

The appropriate method depends on the application. V/f is suitable for many straightforward speed-control applications, while vector control is useful when the machine requires improved speed regulation, torque response, or low-speed performance.

10. How do I back up Yaskawa AFD parameters?

Use the drive’s supported parameter backup/restore functions and retain a documented parameter sheet or configuration file with the machine records.

Final Takeaway

Yaskawa AFD programming is not about memorizing hundreds of parameters. It is about understanding the relationship between the motor, drive control method, command source, frequency reference, mechanical load, protection settings, and automation system.

Start with accurate motor data. Select the control strategy based on the application. Configure the run and frequency-reference sources deliberately, perform Auto-Tuning when appropriate, commission the motor at controlled speeds, and then integrate the drive into the PLC or network architecture.

The most reliable Yaskawa installations are the ones where every important parameter has a clear engineering reason behind it.

Recommended Automation Pioneer Resources

To deepen your understanding of industrial automation, critical factory infrastructure, and digital transformation, explore these related resources on Automation Pioneer:

These articles offer additional technical insights into the automation, networking, monitoring, and control technologies that support modern industrial automation and mission-critical infrastructure.

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