Code dEv (Alarm): Speed Deviation (when using a PG option card and AOLV/PM without PG)
Issue Description & Safety Warning
The Yaskawa A1000 AC Drive has triggered a critical Speed Deviation (when using a PG option card 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: Alarm / minor 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. Parameter settings are inappropriate. 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 value of the speed feedback signal frequency when the motor runs at the maximum speed. - Adjust the speed feedback signal using parameters H6-03 through H6-05. - Make sure the speed feedback signal frequency does not exceed he maximum input frequency of terminal RP. The motor brake engaged. Ensure the 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 (Alarm) 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.
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