Code dEv (Fault): Speed Deviation (for Control Mode with PG and AOLV/PM without PG)
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Speed Deviation (for Control Mode with PG and AOLV/PM without PG) 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: Fault Manual section: Yaskawa A1000 Troubleshooting Load is too heavy. Reduce the load. Acceleration and deceleration times are set too short. Increase the acceleration and deceleration times (C1-01 through C1-08). The load is locked up. Check the machine. Parameters are not set appropriately. Check the settings of parameters F1-10 and F1-11. Incorrect speed feedback scaling if terminal RP is used as speed feedback input in V/f control. - Set H6-02 to the same value as the speed feedback signal frequency when the motor runs at maximum speed. - Adjust the speed feedback signal using parameters H6-03 through H6-05. - Make sure the speed feedback signal frequency does not exceed the maximum input frequency of terminal RP. Motor brake engaged. Ensure the motor brake releases properly.
Source: Yaskawa AC Drive A1000 High Performance Vector Control Drive Technical Manual (SIEP C710616 21H)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Yaskawa A1000 AC Drive Alarms
Yaskawa controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code dEv (Fault) on the A1000 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: 280 Yaskawa A1000 AC Drive codes.
Have a better solution?
Help the industrial community by sharing your repair experience for code dEv (Fault).
Need a searchable reference for more Yaskawa A1000 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