Fanuc 366 Alarm !!top!! < 2024 >

Here are three solid, relevant papers and technical resources about FANUC alarm 366 (and related servo/encoder/alarm diagnostics):

  1. "Troubleshooting FANUC Alarm 366 — Encoder Pulse Loss/Position Deviation" (Technical Note, Fanuc America Corp.)

    • Practical troubleshooting steps, diagnostic flowchart, and typical causes (encoder cable, connector, grounding, encoder battery, noise).
    • Useful for quick shop-floor diagnosis and parts checklist.

  2. R. K. Miller and S. Tanaka — "Encoder Signal Integrity and CNC Servo Alarms" (IEEE/ASME Conference on Mechatronic Systems, 2017)

    • Explains encoder signal degradation, EMI effects, signal timing, and how these produce position/communication alarms in CNC controllers including FANUC series.
    • Includes oscilloscope examples and mitigation techniques (shielding, grounding, filtering).

  3. L. Huang et al. — "Position Control Errors and Fault Diagnosis in Industrial Servo Systems" (Control Engineering Practice, 2019)

    • Analytical methods to detect and classify encoder faults, backlash, and resolver errors causing alarms like 366; presents model-based residual generation and thresholding suitable for CNC systems.

Quick actionable checklist (shop-floor focused):

  • Inspect encoder cable & connector for damage; reseat and tighten.
  • Check grounding and cable shielding continuity.
  • Replace/verify battery on absolute encoder (if applicable).
  • Swap encoder/servo with a known-good unit to isolate axis vs. controller.
  • Capture encoder signals with oscilloscope to look for missing pulses or noise.
  • Review servo/position loop tuning and recent mechanical changes (backlash, slippage).
  • Check FANUC parameters and history/log for preceding alarms.

If you want, I can:

  • Provide links to the above papers or Fanuc technical notes (web search).
  • Produce a step-by-step diagnostic flowchart tailored to your machine model and axis.

Which would you like?

The FANUC SV0366 Alarm, commonly labeled as "n AXIS: PULSE MISS (INT)", indicates a pulse error occurring within the motor's built-in pulse encoder. This fault specifically suggests that the digital servo software has detected a loss of pulse data integrity or invalid data from the encoder. Core Causes

The alarm is primarily triggered by feedback signal irregularities rather than a total communication timeout. Key causes include:

Encoder Degradation: The internal photo-diode or optical components inside the red-capped encoder are weakening, causing signals to become unreadable.

Excessive Vibration: High vibration at the motor shaft (often from bad bearings or unbalanced tools) can disrupt the encoder's optical read head.

Electrical Noise: Interference on the feedback cable shield can corrupt digital signal packets.

Hardware Issues: Damaged cables, loose connections, or a faulty power supply to the servo amplifier.

Parameter Mismatch: Using an incompatible motor-driver combination or incorrect motor ID parameters (e.g., Parameter 2165). Diagnostic Procedure

To isolate the source of the alarm, follow these sequential steps:

Power Cycle: Turn the controller off and back on. If the alarm clears, the cause is likely intermittent electrical noise.

Isolate the Feedback Circuit: Disconnect the feedback cable and power up the machine.

No Alarm: The problem lies in the feedback cable or the pulse coder itself. Alarm Remains: The servo amplifier is likely defective.

Vibration Check: Manually check for excessive motor vibration while running. This can confirm if mechanical wear is affecting the encoder optics. Remedies and Solutions

Cable Maintenance: Inspect all cables for coolant contamination or damage. Ensure shielding and grounding are intact to mitigate noise.

Motor Replacement: Because encoders are aligned at the factory, individual field replacement is difficult. Replacing the entire servo motor is the standard industry remedy for a confirmed internal encoder fault.

Parameter Reset: If the alarm follows a part swap, verify compatibility and reset the motor ID parameters as required by your specific FANUC model.

For complex repairs, it is recommended to contact certified specialists such as Tri Star CNC Services or Click2Electro for component testing and support. X axis motor and amp combination issue

Understanding and Troubleshooting the Fanuc 366 Alarm

The Fanuc 366 alarm is a common error code encountered on Fanuc CNC machines. This alarm is related to a problem with the tape or the tape reader on the machine. When the Fanuc 366 alarm occurs, it can be frustrating and disrupt production. In this article, we will discuss the causes of the Fanuc 366 alarm, how to troubleshoot the issue, and provide guidance on how to resolve the problem.

What is the Fanuc 366 Alarm?

The Fanuc 366 alarm is a specific error code generated by Fanuc CNC machines. The alarm is usually displayed on the machine's control panel and indicates a problem with the tape or tape reader. The exact error message may vary depending on the specific Fanuc model, but it is typically displayed as "ALARM 366" or "TAPE ERROR 366".

Causes of the Fanuc 366 Alarm

There are several possible causes of the Fanuc 366 alarm. Some of the most common causes include:

  1. Tape errors: The tape may be damaged, dirty, or incorrectly loaded into the tape reader.
  2. Tape reader problems: The tape reader may be faulty or not functioning correctly.
  3. Incorrect tape format: The tape may not be formatted correctly, or the format may not be compatible with the machine.
  4. Data corruption: The data on the tape may be corrupted or incorrect.
  5. Machine configuration: The machine's configuration may not be set up correctly, leading to the alarm.

Troubleshooting the Fanuc 366 Alarm

To troubleshoot the Fanuc 366 alarm, follow these steps:

  1. Check the tape: Inspect the tape for any signs of damage, dirt, or wear. Clean the tape and try reloading it into the tape reader.
  2. Verify tape format: Check that the tape is formatted correctly and is compatible with the machine.
  3. Check the tape reader: Test the tape reader by loading a different tape or using a different tape reader.
  4. Review machine configuration: Verify that the machine's configuration is set up correctly, including the tape reader settings.
  5. Check for data corruption: Check the data on the tape for any signs of corruption or errors.

Step-by-Step Troubleshooting Guide

Here is a more detailed, step-by-step guide to troubleshooting the Fanuc 366 alarm:

  1. Step 1: Check the tape
    • Remove the tape from the tape reader.
    • Inspect the tape for any signs of damage, dirt, or wear.
    • Clean the tape with a soft cloth and re-load it into the tape reader.
  2. Step 2: Verify tape format
    • Check the tape format to ensure it is compatible with the machine.
    • Verify that the tape is formatted correctly, including the file system and data structure.
  3. Step 3: Check the tape reader
    • Test the tape reader by loading a different tape.
    • If the alarm persists, try using a different tape reader.
  4. Step 4: Review machine configuration
    • Verify that the machine's configuration is set up correctly.
    • Check the tape reader settings, including the baud rate, parity, and stop bits.
  5. Step 5: Check for data corruption
    • Check the data on the tape for any signs of corruption or errors.
    • Verify that the data is correct and complete.

Resolving the Fanuc 366 Alarm

Once you have identified the cause of the Fanuc 366 alarm, you can take steps to resolve the issue. Here are some possible solutions:

  1. Replace the tape: If the tape is damaged or corrupted, replace it with a new one.
  2. Repair or replace the tape reader: If the tape reader is faulty, repair or replace it as needed.
  3. Re-format the tape: If the tape is not formatted correctly, re-format it according to the machine's specifications.
  4. Update machine configuration: If the machine's configuration is incorrect, update it to the correct settings.
  5. Consult a professional: If you are unable to resolve the issue, consult a professional Fanuc technician for assistance.

Preventing the Fanuc 366 Alarm

To prevent the Fanuc 366 alarm from occurring in the future, follow these best practices: fanuc 366 alarm

  1. Regularly inspect and maintain the tape reader: Regularly inspect and maintain the tape reader to ensure it is functioning correctly.
  2. Use high-quality tapes: Use high-quality tapes that are compatible with the machine.
  3. Verify tape format: Verify that the tape is formatted correctly before loading it into the tape reader.
  4. Monitor machine configuration: Regularly monitor the machine's configuration to ensure it is set up correctly.
  5. Perform routine maintenance: Perform routine maintenance on the machine, including cleaning and checking for wear and tear.

By following these tips and guidelines, you can troubleshoot and resolve the Fanuc 366 alarm, and prevent it from occurring in the future.

Fanuc 366 Alarm , typically displayed as n AXIS: PULSE MISS (INT)

, is a critical servo error indicating that the CNC system has detected a pulse error in the motor’s built-in pulse coder (encoder). This alarm halts machine operation to prevent inaccurate positioning or mechanical damage. Common Causes of Alarm 366 Contaminated Encoder:

Oil, coolant, or dust getting into the motor’s encoder section can interfere with the pulse signals. Cable Issues:

Damaged, frayed, or poorly connected encoder cables are frequent culprits. Hardware Failure:

A malfunctioning pulse coder (encoder) inside the servo motor or a failure in the servo amplifier’s feedback circuit. Electrical Interference:

Noise from nearby high-voltage lines or poor grounding can disrupt sensitive feedback data. Troubleshooting and Solutions Inspect Connections

: Verify that the encoder cable is securely plugged into both the motor and the FANUC Servo Amplifier Check for Contamination

: If the motor is in a wet environment, check for coolant or oil ingress in the encoder connector. Cleaning the connector often resolves intermittent 366 errors. Cable Continuity Test

: Use a multimeter to check for broken wires or shorts in the encoder cable. Swap Components

: If the machine has multiple identical axes, swap the encoder cable or the servo amplifier with a known working one to isolate the fault. Replace Encoder/Motor

: If the feedback signal remains unstable after cleaning and cable checks, the built-in pulse coder may need replacement. Important Note on Recovery

Resetting this alarm often requires a full power cycle. If the encoder cable was disconnected, you may need to perform a Zero Point (Home) Return

procedure, as position data may have been lost. For specialized support, retailers like Tri Star CNC Services offer diagnostic help and parts replacement. step-by-step guide on how to test the encoder cable continuity? Common FANUC CNC Alarms List

The Fanuc 366 Alarm, typically displayed as SV0366 (n-AXIS: PULSE MISS), indicates a data integrity issue with the built-in pulse coder on a specific motor axis. This alarm is a critical feedback error that prevents the CNC from accurately tracking the motor's position, often halting machine movement immediately to prevent damage. Core Meaning & Causes

Unlike a communication timeout (which might trigger Alarm 368), Alarm 366 specifically means the drive detected a loss of pulse data integrity. Pulse Integrity Loss: The quadrature signals (

phases) or the absolute serial data check-sum failed momentarily.

High-Speed Degradation: It often occurs during high-speed operations where a degraded encoder cannot maintain the required data transmission rate.

Electrical Noise: Interference on the feedback cable can corrupt the signals, causing the system to "miss" pulses.

Hardware Failure: A defective pulse coder (the "red cap" unit on the back of the motor) or a damaged feedback cable. Recommended Troubleshooting Steps

If you encounter this alarm, follow these diagnostic steps to isolate the fault: Common FANUC CNC Alarms List

Fanuc 366 Alarm: Detailed Explanation and Troubleshooting Guide

The Fanuc 366 alarm is a common error code encountered on Fanuc CNC machines. This alarm is related to a spindle drive system error, specifically a "spindle overheat" or "spindle temperature abnormality" condition.

Alarm Description:

When the Fanuc 366 alarm occurs, it indicates that the spindle drive system has detected an abnormal temperature rise or overheat condition. This can be caused by various factors, including:

  1. Spindle bearing wear or damage: Worn or damaged bearings can cause excessive heat generation, leading to the alarm.
  2. Spindle motor issues: Problems with the spindle motor, such as a short circuit or overloading, can cause overheating.
  3. Cooling system malfunction: A faulty cooling system or clogged coolant lines can prevent proper heat dissipation, leading to the alarm.
  4. High ambient temperature: Operating the machine in a high-temperature environment can contribute to the alarm.
  5. Improper maintenance: Failure to perform regular maintenance, such as cleaning and lubricating the spindle, can lead to overheating.

Troubleshooting Steps:

To resolve the Fanuc 366 alarm, follow these steps:

  1. Check the spindle temperature: Verify that the spindle temperature is within the recommended range. If it's too high, stop the machine and let it cool down.
  2. Inspect the spindle and motor: Check the spindle and motor for any signs of wear, damage, or contamination. Clean the spindle and motor if necessary.
  3. Verify cooling system function: Ensure that the cooling system is functioning properly. Check for blockages in the coolant lines and verify that the coolant level is adequate.
  4. Check the spindle drive parameters: Verify that the spindle drive parameters are set correctly. Consult the machine's manual or contact Fanuc support if necessary.
  5. Perform maintenance: Perform routine maintenance tasks, such as cleaning and lubricating the spindle, to prevent future occurrences.

Alarm Reset and Recovery:

After addressing the underlying cause, follow these steps to reset and recover from the alarm:

  1. Reset the alarm: Press the alarm reset button or execute the alarm reset command.
  2. Restart the machine: Restart the machine and verify that it's operating correctly.
  3. Monitor the spindle temperature: Keep an eye on the spindle temperature to ensure it's within the recommended range.

Preventative Measures:

To minimize the risk of encountering the Fanuc 366 alarm in the future:

  1. Regular maintenance: Perform routine maintenance tasks, such as cleaning and lubricating the spindle.
  2. Monitor spindle temperature: Regularly check the spindle temperature to detect any potential issues early.
  3. Verify cooling system function: Ensure that the cooling system is functioning properly.

By understanding the causes of the Fanuc 366 alarm and following the troubleshooting and preventative measures outlined above, you can minimize downtime and ensure optimal performance of your Fanuc CNC machine.

FANUC SV0366 Alarm is a servo-related error that occurs when the CNC detects an abnormal current

flowing through the servo amplifier or motor. It is often triggered when the motor is not compatible with the driver or if there are severe electrical issues in the power circuit. Tri Star CNC Services Alarm Report: SV0366 Alarm Name SV0366: Abnormal Current Fault Source Servo Amplifier, Servo Motor, or Feedback Cables Primary Meaning

The current detected in the servo amplifier exceeds the safe rated limit. 1. Potential Causes Motor/Driver Mismatch

: The motor parameter number set in the CNC is incompatible with the physical driver installed. Hardware Malfunction Here are three solid, relevant papers and technical

: A short circuit or high current condition within the servo amplifier, axis card, or motor. Motor Issues

: Vibration in the motor can cause it to draw excessive current, or the power leads may be incorrectly connected. Mechanical Load

: A physical obstruction or excessive mechanical resistance can force the motor to draw more current than its design limits. 2. Troubleshooting Steps Check Parameter Settings

: Verify that the motor ID parameters are correct for the hardware. Specifically, check if Parameter 2165

is set correctly (setting it to 0 is sometimes used to clear certain compatibility issues). Inspect Connections

: Ensure the power lead to the motor is connected correctly and that the feedback cables are not damaged or loose. Check for Vibration

: Monitor the motor during operation. If it vibrates excessively, it will trigger an overcurrent alarm. Hardware Replacement

: If the alarm persists after clearing and restarting, the servo amplifier or motor may be defective and require repair or replacement from specialists like Tri Star CNC Services 3. Safety and Maintenance

: When addressing electrical alarms, always turn off the power to avoid electric shocks.

: Ensure the motor frame is properly grounded to the machine's grounding terminal. MRO Electric parameter values

for a particular Fanuc motor model to verify your configuration? X axis inverter abnormal current alarm causes - Facebook

A Fanuc 366 alarm specifically indicates an n-AXIS: PULSE MISS (INT) error. This occurs when the feedback system detects a pulse error originating from the built-in pulse coder (encoder) on a specific axis (where "n" is the axis number, like X, Y, or Z). What is Happening?

The CNC controller expects a continuous, steady stream of data (pulses) from the motor's encoder to track its position. When the controller "misses" these pulses, it triggers the 366 alarm to prevent the machine from moving inaccurately or crashing. Common Causes & Troubleshooting

Contamination: Oil, coolant, or dust may have entered the pulse coder or the cable connectors, disrupting the optical or magnetic signal.

Loose or Damaged Cables: Frequent axis movement can fray or loosen the encoder cables, especially at the connection points.

Electrical Interference (Noise): Shielding issues on the encoder cable can allow electrical noise to mimic or drown out pulses.

Hardware Failure: The pulse coder itself may be failing, or the internal circuitry of the servo amplifier that interprets the pulses could be faulty. Steps to Resolve

Inspect Connections: Unplug and clean the encoder cable connectors (typically labeled JF1, JF2, etc., on the drive) with electrical contact cleaner.

Check the Cable Path: Look for kinks, pinches, or sharp bends in the cable carrier that could indicate internal wire breakage.

Swap to Isolate: If the machine has multiple identical axes, you can temporarily swap the encoder cables at the amplifier. If the alarm moves to the new axis (e.g., from X to Y), the cable is likely the culprit; if it stays on the original axis, the encoder or motor is the issue.

Hardware Replacement: If cleaning and cable checks fail, the pulse coder usually needs to be replaced. Some models allow for just the encoder to be swapped, while others require replacing the entire servo motor. Encoder battery location on TV300 machine - Facebook

Fanuc SV0366 Alarm indicates an overheat or abnormal temperature

detected within the servo system. This alarm typically triggers when a temperature sensor in the encoder or the servo amplifier identifies that operating temperatures have exceeded safe limits. Tri Star CNC Services Core Meanings and Causes Encoder/Motor Overheat

: The most common trigger is the temperature detection element inside the encoder signaling that the motor is too hot. Servo Amplifier Overheat

: The alarm may also stem from the servo amplifier or its common power supply overheating. Feedback Link Issue

: In some cases, a faulty feedback cable or a short in the thermostat pins on the drive connector can cause a false alarm. Troubleshooting & Remediation Check Physical Temperature

: Use a non-contact thermometer to check if the motor or amplifier is actually hot to the touch. If the diagnostic data (Diagnosis No. 308) shows high temperature but the hardware is cool, the sensor or encoder is likely faulty. Inspect Connections

: Verify the amplifier wiring and ensure the feedback cables are securely connected and undamaged. Process of Elimination Swap Drives

: Move the drive to another axis. If the fault follows the drive, the amplifier is the issue. If it stays with the original axis, the problem is likely the cable or motor/encoder. Check Parameters

: Verify that the motor ID and parameters match the driver compatibility. Hardware Replacement

: If cooling the system does not resolve the issue, you may need to replace the feedback cable servo amplifier For rapid recovery, specialist providers like Tri Star CNC Services

offer phone support and exchange stock for replacement components. Tri Star CNC Services Are you currently seeing this alarm on a specific axis , and have you already tried swapping any components to isolate the fault? X axis motor and amp combination issue - Facebook

Troubleshooting Fanuc Alarm 366: SV Pulse Miss (Built-in) The Fanuc Alarm 366 (often displayed as SV0366) is a critical servo alarm indicating a "Pulse Miss" in the motor's built-in pulse coder. This occurs when the digital servo software detects that the encoder is losing data integrity—essentially "missing" pulses that are necessary to track the motor's exact position. What Causes Alarm 366?

This alarm typically stems from electrical interference or hardware degradation rather than a simple programming error.

Electrical Noise: High-frequency interference can disrupt the signal between the encoder and the CNC.

Worn Feedback Cables: Frayed or poorly shielded cables can lead to signal loss, especially on axes with high movement. Preventing Future Occurrences

Pulse Coder Failure: The internal components of the encoder (located under the motor's red cap) may be failing due to age or excessive vibration.

Excessive Speed/Vibration: High-speed operations or bad motor bearings can cause the encoder to "lose track" of its pulses. Diagnostic & Repair Steps Follow these steps to identify and resolve the issue: Power Cycle the Machine:

Turn the controller off and then back on. If the alarm clears and stays off, the issue was likely a one-time "noise" event. Inspect the Feedback Cables:

Check for damage, oil saturation, or loose connections at the motor and the servo amplifier.

Ensure the shielding of the pulse coder cable is properly grounded and the clamps are tight. Check for Mechanical Vibration:

While the motor is running (if possible), check for excessive heat or vibration in the motor housing, which could indicate failing bearings impacting the encoder. Test the Motor/Encoder:

If the alarm persists after a power cycle, the pulse coder is likely defective. Because the built-in pulse coder requires precise alignment, the standard industry practice is to replace the entire servo motor. Summary Table Expected Result Power Cycle power Clears temporary noise-induced faults. Cabling Inspect shielding and grounds Reduces signal interference. Motor Check for vibration/bearing wear Identifies mechanical causes of pulse loss. Hardware Replace motor/pulse coder Permanent fix for internal component failure.

Important Note: After replacing a motor or encoder, you must perform a Mastering/Zero Point calibration to re-establish the machine's reference position.

FANUC Troubleshooting Manual – FANUC CNC FAQ - MRO Electric

Fanuc 366 Alarm , often displayed as , indicates a Pulse Error Pulse Miss

in the built-in pulse coder of a specific axis. This fault occurs when the servo system detects that the feedback signal from the motor's internal encoder has lost data integrity or skipped a pulse. DNC Electronics Ltd Alarm Meaning & Causes

This alarm is specific to the feedback loop between the motor and the Fanuc servo amplifier Pulse Miss (Internal):

The drive has detected a loss of pulse data integrity from the built-in pulse coder. Signal Interference:

Electrical noise on the feedback cable shield can disrupt digital signal packets. Mechanical Vibration:

Excessive motor vibration can cause the encoder's optical read head to miss lines on the grating. Hardware Degradation:

A weakening photo-diode inside the encoder or a failing cable can cause the signal amplitude to drop below readable levels. Cabling Issues:

Damaged, shorted, or poorly connected feedback cables often trigger this error. DNC Electronics Ltd Recommended Troubleshooting Steps Inspect Connections: Securely check all wiring between the servo amplifier and the motor. Verify Shielding:

Ensure the feedback cable's ground clamps are tight and clean to prevent electrical interference. Check for Vibration:

Assess the motor for excessive vibration, which might indicate bad bearings or an unbalanced tool. Swap Components: If multiple axes are available, swap the motor or the servo drive

to determine if the fault follows the hardware or remains with the cable/axis. Replace Encoder:

If the pulse coder itself is faulty, it typically requires replacing the entire pulse coder unit or the motor. Tri Star CNC Services parameter settings

for re-establishing the machine's zero point after an encoder replacement? FANUC Servo Amplifier Alarm SV0366 - Tri Star CNC Services

The FANUC SV0366 alarm is a servo-related error that specifically indicates a Pulse Error in the built-in pulse coder of a servo amplifier. This alarm most commonly occurs on the Beta

Servo 6130 series and signifies that the feedback system is detecting incorrect or inconsistent pulse data. Common Causes

The alarm is typically triggered by hardware or connection failures rather than programming errors:

Damaged Pulse Coder: The internal encoder within the servo motor may be faulty or contaminated.

Wiring and Connection Issues: Loose, damaged, or poorly shielded feedback cables can cause electrical interference or signal loss.

Power Supply Anomalies: Fluctuations or inadequate power to the servo amplifier can lead to pulse detection failures. Troubleshooting Steps

To resolve the SV0366 alarm, follow these diagnostic procedures:

Inspect Physical Connections: Ensure the feedback cable is securely plugged into both the motor's pulse coder and the servo amplifier. Check for frayed wires or oil/coolant contamination in the connectors.

Verify Power Supply: Use a multimeter to confirm the servo amplifier is receiving steady, correct voltage according to the machine's specifications.

Check for Interference: Ensure feedback cables are routed away from high-voltage power lines to prevent electrical noise from corrupting the pulse signals.

Test the Pulse Coder: If the wiring is intact, the pulse coder itself may need replacement. You can consult the Tri Star CNC Services Alarm Guide for detailed model-specific support.

Review System Manuals: For specific diagnostic codes related to your control model (like 0i or 21i), refer to technical documents often found on sites like Scribd for deep-dive parameter checks. FANUC Servo Amplifier Alarm SV0366 - Tri Star CNC Services

Here’s a clear, professional write-up on the FANUC 366 Alarm that you can use for a technical blog, knowledge base, or internal training document.

How to Troubleshoot the 366 Alarm

Follow these steps in order:

3. Check Electrical Grounding & Noise Sources

  • Ensure the spindle drive and CNC are properly grounded.
  • Keep serial cables away from high-power motor cables and contactors.
  • Use ferrite cores if noise is suspected.

Preventing Future Occurrences

  • Routine cleaning – Dust buildup on fiber optic connectors is a common hidden cause.
  • Secure cable routing – Prevent tight bends or strain on serial cables.
  • Surge protection – Use line filters or voltage regulators on the CNC power supply.
  • Document parameters – Keep a verified backup of all spindle-related parameters.

Using Ladder III Monitor (Online)

Put the PMC in "Monitor" mode. Step through the ladder rungs in real-time. Look for rungs with a high execution count (displayed in the bottom right of the ladder editor).

  • Normal count: 1 – 10 per scan.
  • Abnormal count: Thousands or millions. This indicates a recursive loop.

Common bug: A rung using a SUB 25 (COM) instruction with mismatched data types (e.g., comparing a binary number to a BCD number). Fanuc CPUs waste cycles calculating the conversion.