The load or duty cycle exceeds the motor's rated torque.
Yaskawa drives include several parameters that directly affect overload detection.
Errors in parameters related to torque limits or current levels can cause the drive to report an overload prematurely. Troubleshooting and Solutions
Common mechanical faults include:
Yaskawa Error Code A.910 Overload Warning typically found on Yaskawa Sigma-7 (and occasionally Sigma-5) servo drives. Unlike hard faults that immediately shut down the system, this code acts as an early warning alert. It notifies operators that the motor has been operating continuously at a torque level exceeding its rating, putting it on the verge of a critical overload trip (such as an A.710 or A.720 overload alarm).
Unlike a system fault (which instantly drops the main power circuit and halts axis coordination), the warning is treated as a minor event. The drive's internal microcontrollers flash or display A.910 on the digital operator to signify that the internal motor mathematical thermal model calculates that heat or current absorption has exceeded safe operating metrics. Drive State Consequence if Ignored A.910 Overload Warning System Active (Flashing LED) Escalates immediately to A.710 or A.720 A.710 Instantaneous Overload Hard Trip (Axis Disables) High risk of mechanical shear or gear damage A.720 Continuous Overload Hard Trip (Axis Disables) Thermal degradation of motor winding insulation Core Root Causes and Quick Fixes
In Yaskawa terminology, the "A" prefix designates an or Warning rather than a fatal trip. The A.910 code specifically points to Motor Overload . The drive calculates a thermal load based on the motor's current and operating time. When this value reaches the warning level (usually 80% to 100% of the maximum allowable overload), the A.910 warning triggers. yaskawa error code a910 exclusive
When troubleshooting a machine actively displaying an A.910 code, execute these standard diagnostic steps:
The motor is operating dangerously close to its thermal or torque limits. System Behavior
is set too low for your specific application, the drive will trigger A.910 prematurely. Hardware Failure : In rare cases, internal failure within the The load or duty cycle exceeds the motor's rated torque
Does the error happen at power-up or only during movement ? Have there been any recent mechanical changes or crashes? FS100 ALARM CODE 0910 CPU ERROR (CPU-201R)
: Rapid acceleration/deceleration cycles or continuous high-torque operation can exceed the drive's overload protection characteristics. Parameter Configuration Overload Warning Level (Pn52B)
Multi-function contact outputs do not trip immediately; motor operation is allowed to continue. Unlike a system fault (which instantly drops the
Loose termination or localized impedance jumps across the power delivery pathway lead to asymmetrical current profiles.
Troubleshooting Yaskawa Error Code A910: Exclusive Condition Explained