Yaskawa Error Code A910 Link 90%
Symptom: Intermittent A910 that clears on power cycle. Root Cause: The plastic card retainer clip had broken, allowing 2mm of movement. Fix: Replaced retainer and added a hot-melt glue bead along the card-edge top (field fix).
In Yaskawa’s alarm architecture, codes beginning with "A" are typically Alarms (as opposed to faults, which begin with "F"). The distinction is crucial:
A910 translates to: "COM board connection fault (Option) – Communication card is not properly connected to the control board."
The "Link" in "A910 Link" refers to the internal SPI (Serial Peripheral Interface) bus that connects the drive’s main logic board to the option slot. When the drive powers on or resets, it performs a handshake with any installed option card. If that handshake fails, the drive triggers A910.
Error Type: Communication error between the drive and the keypad, option board, or host controller.
Common Causes:
Typical Solutions:
| Step | Action | |------|--------| | 1 | Power cycle the drive – sometimes clears temporary comm glitches. | | 2 | Check connections – reseat keypad cable, option module, or network cable. | | 3 | Inspect for damage – replace any frayed or crushed cables. | | 4 | Verify parameters – ensure baud rate, parity, and stop bits match between drive and master. | | 5 | Reduce noise – separate control wiring from power cables; use shielded twisted pair cable. | | 6 | Test without option board – if error stops, the board may be faulty. | | 7 | Replace keypad or cable if error persists with local keypad only. |
Affected Yaskawa Series:
Common on V1000, J1000, GA700, GA800, U1000, and A1000 drives.
Manual Reference:
See Yaskawa Technical Manual TOEP C710606 (V1000) or relevant series manual – section on "Faults and Alarms" (A910 = "Keypad/Communication Option Error").
Error Code A910 is one of the more cryptic yet critical alarms in the Yaskawa drive ecosystem. If you are seeing A910 flash across your HMI (Digital Operator), your drive is not dead—but it is signaling a fundamental breakdown in communication between its internal control board and the optional communication card.
The specific keyword phrase associated with this fault is "Yaskawa error code A910 link." Understanding the "link" in this context is the key to solving the problem. Unlike a simple overload or overvoltage fault, A910 points to a physical or logical disconnection between the drive’s main CPU (Control Board) and the communication module (e.g., EtherNet/IP, Profibus, DeviceNet, or CC-Link).
This article will dissect exactly what this error means, why it happens, and a step-by-step procedure to clear it permanently.
Error Code: A910
Designation: Overload Warning (Electronic Thermal Alarm)
Severity: Warning (The drive remains operational but is at risk of a future trip).
System Family: Yaskawa AC Drives (Varispeed G7, A1000, V1000, GA700, etc.) yaskawa error code a910 link
Error code A910 is a predictive maintenance alert. It signals that the motor current has exceeded the safe threshold defined by the motor protection parameters, but it has not yet reached the critical level required to trip the drive (which would trigger error A920 or A950).
This feature effectively tells the operator: "The motor is running hot; reduce the load or check the system before the drive shuts you down."
You have exhausted all hardware and parameter checks. Contact Yaskawa Technical Support (1-800-YASKAWA in the US) if:
*This document is for reference only. Always consult the specific Technical Manual for your Yaskawa drive model (e.g., A1000, V1000, GA700
Troubleshooting Yaskawa Error Code A910: Understanding Link Interruptions
In the world of industrial automation, Yaskawa AC drives (VFDs) are renowned for their reliability. However, even the most robust systems encounter faults. One such event is the A910 error code, often accompanied by the description "Link Interruption."
This article breaks down what this error means, why it happens, and the step-by-step process to get your machinery back online. What is Yaskawa Error A910?
In Yaskawa technical manuals, A910 is classified as an Alarm, not necessarily a hard Fault (though it can stop operations). Specifically, it indicates a Station Link Interruption.
This occurs when the drive’s communication option card (such as a Modbus, EtherCAT, or PROFINET card) loses its connection with the master controller (PLC) or the wider network. Essentially, the drive is still powered on, but it has "lost the signal" from its commander. Common Causes of A910
Before tearing apart your control cabinet, consider these common culprits:
Faulty Cabling: A damaged Ethernet cable, a loose RJ45 connector, or a frayed serial wire.
Network Noise (EMI): High-voltage lines running too close to communication cables can cause electromagnetic interference, dropping the signal.
Master Controller (PLC) Issues: If the PLC goes into "Stop" mode or loses power, the drive will trigger A910. Symptom: Intermittent A910 that clears on power cycle
Incorrect Parameter Settings: If the drive's communication timeout (Watchdog) is set too low, minor network jitters can trigger the alarm.
Option Card Failure: In rare cases, the physical communication card seated in the drive may have shifted or failed. Step-by-Step Troubleshooting Guide 1. Inspect Physical Connections
Start with the basics. Ensure all communication cables are securely seated in their ports. Check for sharp bends or crimps in the cable that might have damaged the internal copper or fiber. 2. Verify the Master Controller Status
Check your PLC. Is it in "Run" mode? Are there any errors on the PLC side indicating a network-wide failure? If the entire network is down, the A910 is just a symptom of a larger issue. 3. Check for Electrical Interference
Ensure that your communication cables are shielded and that the shields are properly grounded. Avoid running communication lines parallel to motor output cables or high-voltage AC lines. If they must cross, they should do so at a 90-degree angle. 4. Review Drive Parameters
Check the communication settings in the drive (typically in the F6-XX or H5-XX parameter groups depending on your specific model, like the GA700 or A1000).
Watchdog Timers: If the communication timeout is too aggressive (e.g., 10ms), try increasing it slightly to allow for normal network latency. 5. Reseat the Option Card
Turn off all power to the drive and wait for the "Charge" LED to extinguish. Carefully open the drive cover and ensure the communication option card is firmly snapped into its slot. Over time, vibration can sometimes cause these cards to wiggle loose. How to Clear the A910 Alarm
Unlike a "Fault" which requires a manual reset, an Alarm like A910 often clears itself once the underlying cause is resolved (i.e., when the link is restored). However, if your drive is configured to "Fault on Communication Loss," you may need to: Restore the link.
Press the RESET key on the digital operator or cycle the drive’s power.
The Yaskawa A910 error is almost always a communication handshake issue. By systematically checking your cabling, reducing electrical noise, and verifying your PLC status, you can resolve the "Link Interruption" and minimize downtime.
Note: Always consult the specific technical manual for your Yaskawa model (GA500, GA700, A1000, V1000) as parameter addresses can vary.
The Yaskawa error code A.910 is an Overload Warning (pre-alarm) primarily found in Sigma-series servo drives (Sigma-3, Sigma-5, and Sigma-7). It serves as a precursor to more severe faults like A.710 (instantaneous overload) or A.720 (continuous overload). Error Summary A910 translates to: "COM board connection fault (Option)
Definition: The drive has detected that the motor is approaching its overload protection limit.
Behavior: In many configurations, the drive will continue to run while the alarm flashes, but it will trip (stop) if the load is not reduced. Common Causes & Troubleshooting Potential Cause Recommended Action Excessive Mechanical Load
Check for mechanical jams, binding, or friction in the system. Incorrect Wiring
Inspect the servomotor and encoder wiring for loose contacts or incorrect phases. Tight Duty Cycle
The operation pattern (acceleration/deceleration) may exceed the motor’s rated capacity. Parameter Settings
Check Pn52B (Overload Warning Level). If set too low, it triggers the warning prematurely. Environmental Heat
High temperatures inside the SERVOPACK panel (above 55°C) can trigger thermal-related warnings. Hardware Failure
If the load is normal and wiring is secure, the internal current detection circuit in the SERVOPACK may be faulty. Recommended Tools
SigmaWin+: Use this software to monitor the accumulated load ratio (Un009) and view the alarm trace to see exactly when the overload occurs.
Yaskawa Manuals: Refer to the specific troubleshooting manual for your drive series (e.g., Sigma-7 Troubleshooting Manual) for detailed parameter lists. To help you further, could you let me know: Which drive series are you using (e.g., Sigma-7, Sigma-5)?
Is this happening during startup or while the machine is running?
Have there been any recent mechanical changes to the machine? Σ-7C SERVOPACK - Troubleshooting Manual