YASKAWA AC Drive GA700 High Performance Type Technical Manual

Code	Name	Causes	Possible Solutions
dEv	Speed Deviation	The load is too heavy.	Decrease the load.
Acceleration and deceleration times are set too short.	Increase the values set in C1-01 to C1-08 [Acceleration/Deceleration Time].
The dEv detection level settings are incorrect.	Adjust F1-10 [Speed Deviation Detection Level] and F1-11 [Speed Deviation Detect DelayTime].
The load is locked up.	Examine the machine.
The holding brake is stopping the motor.	Release the holding brake.
Note: The drive detects this error if the difference between the detected speed and the speed reference is more than the setting of F1-10 for longer than F1-11. Do a Fault Reset to clear the fault. If the drive detects this error, the drive will operate the motor as specified by the stopping method set in F1-04 [Speed Deviation Detection Select].

dEv

Speed Deviation

The load is too heavy.

Decrease the load.

Acceleration and deceleration times are set too short.

Increase the values set in C1-01 to C1-08 [Acceleration/Deceleration Time].

The dEv detection level settings are incorrect.

Adjust F1-10 [Speed Deviation Detection Level] and F1-11 [Speed Deviation Detect DelayTime].

The load is locked up.

Examine the machine.

The holding brake is stopping the motor.

Release the holding brake.

Note:

The drive detects this error if the difference between the detected speed and the speed reference is more than the setting of F1-10 for longer than F1-11.
Do a Fault Reset to clear the fault.
If the drive detects this error, the drive will operate the motor as specified by the stopping method set in F1-04 [Speed Deviation Detection Select].