5-1 Protective Functions and Troubleshooting 5 Maintenance Operations *1. The reset command is not accepted until approximately 10 seconds after the trip occurs (protection function works). *2. The reset command is not accepted if the EEPROM error occurs. Turn off the power once. If you find E08 when turning on the power again, it is possible that the memory element has been broken or the parameters have not been memorized correctly. Perform the user initialization to set the parameters again. *3. The reset command through the RS terminal or STOP/RESET key is not accepted. Turn off the power. *1. The reset command through the RS terminal or STOP/RESET key is not accepted. Turn off the power.
*2. The reset operation via the Digital Operator is not accepted. Be sure to reset via the RS terminal. 5-2 Name Description Display on Digital Operator Check point and remedy Reference page Braking resistor overload protection Shuts off the output and displays an error if the usage rate of regenerative braking circuit exceeds the b090 set value. ek0k6. Is there any rapid deceleration? (Increase the deceleration time.) Is the operation cycle frequent? (Increase the operation cycle.) Is the usage rate setting of the regenerative braking function low? (Set to an appropriate level.) Note: Pay attention to the allowable power of the resistor.
4-8 4-71 Overvoltage protection Extremely high DC voltage between P/+2 and N/- may result in failure. This function therefore shuts off the output and displays an error if the DC voltage between P/+2 and N/- exceeds the specified level because of regenerative energy from the motor or increase of the incoming voltage during operation. Trips when the DC voltage between P/+2 and N/- reaches approximately 400 V DC for 200-V class, and 800 V DC for 400-V class. ek0k7. Is there any rapid deceleration? (Increase the deceleration time.) Is there any ground fault? (Check the output wires and motor.) Has the motor been rotated from the load side?
(Reduce regenerative energy.) EEPROM error *2 *3 Shuts off the output and displays an error if an error occurs in the built-in EEPROM because of external noise or abnormal temperature rise. Note: It may become a CPU error depending on the case. ek0k8. Is there any large noise source around? (Countermeasures against noise) Has the cooling efficiency been reduced? (Check that there is no clogging in the cooling fin and clean it.) (Replace the cooling fan.) ek0k6. ek0k7. ek0k8. ek0k8. Name Description Display on Digital Operator Check point and remedy Reference page Undervoltage Shuts off the output if the incoming voltage drops below the specified level.
This is because the control circuit fails to work properly when the incoming voltage to the Inverter drops. Trips when the DC voltage between P and N drops to approximately 175 V DC for 200-V class, and 345 V DC for 400-V class. ek0k9. Has the power supply voltage decreased? (Check the power supply.) Is the power supply capacity sufficient? (Check the power supply.) Has the thyristor been broken? (Check the thyristor.) 4-28 ek0k9.