Code CE (Alarm): MEMOBUS/Modbus Communication Error
Issue Description & Safety Warning
The Yaskawa V1000 AC Drive has triggered a critical MEMOBUS/Modbus Communication Error alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Code type: Alarm / minor fault Manual section: Yaskawa V1000 Troubleshooting A data error occurred due to noise. - Check options available to minimize the effects of noise. - Counteract noise in the control circuit wiring, main circuit lines and ground wiring. - Reduce noise on the controller side. - Use surge absorbers on magnetic contactors or other equipment causing the disturbance. - Use cables recommended by Yaskawa or another type of shielded line. The shield should be grounded on the controller side or on the drive input power side. - Separate all wiring for communications devices from drive input power lines. Install an EMC noise filter to the input side of the drive input power. Communication protocol is incompatible. - Check the H5 parameter settings as well as the protocol setting in the controller. - Ensure settings are compatible. The CE detection time (H5-09) is set shorter than the time required for a communication cycle to take place. - Check the PLC. - Change the software settings in the PLC. - Set a longer CE detection time (H5-09). Incompatible PLC software settings or there is a hardware problem. - Check the PLC. - Remove the cause of the error on the controller side. Communications cable is disconnected or damaged. - Check the connector for a signal through the cable. - Replace the communications cable.
Source: Yaskawa AC Drive V1000 Compact Vector Control Drive Technical Manual (SIEP C710606 19D)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa V1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code CE (Alarm) on the V1000 AC Drive identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Yaskawa's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 153 Yaskawa V1000 AC Drive codes.
Have a better solution?
Help the industrial community by sharing your repair experience for code CE (Alarm).
Need a searchable reference for more Yaskawa V1000 AC Drive manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026