5-1 Protective Functions and Troubleshooting 5 Maintenance Operations *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. 5-5 Name Description Display on Digital Operator Check point and remedy Reference page Brake error When 01 is selected in b120 (brake control selection), this error appears if the brake ON/OFF cannot be confirmed within the b124 set time (brake confirmation wait time) after the Inverter outputs the brake release signal. ek3k6. Is the brake ON/OFF function working? (Brake check) Is the set time for b124 too short?
(Increase b124.) Has the brake confirmation signal been input? (Wiring check) 4-72 Emergen- cy shutoff *2 Shuts off the hardware output and displays an error when the EMR terminal (S3) is turned on with SW1 on the logic board ON. ek3k7. Did any error occur in the external devices when the emergency shutoff function was selected? (Correct the external device error.) 2-9 Overload protection in a low speed range If an overload is detected in the lowest speed range of 0.2 Hz max., an electronic thermal inside the Inverter works to shut off the Inverter output. (2nd electronic thermal) (However, higher frequency could remain in the error history.) ek3k8. Is the load too large?
(Reduce the loading factor.) Modbus communic ations error Appears when the timeout occurs because of disconnection during Modbus-RTU communication. (Trip by the C076 setting) ek4k1. Is the communication speed correct? Is the wiring distance appropriate? (Connection check) 4-137 Option 1 error Detects an error on the board mounted on option slot 1. ek6k0. to ek6k9. Has the option board been securely mounted? (Check that the mounting is correct.) Option 2 error Detects an error on the board mounted on option slot 2. ek7k0. to ek7k9. Has the option board been securely mounted?
(Check that the mounting is correct.) Undervoltage standby Shows the waiting status after the incoming Inverter voltage decreases and shuts off. This error also appears during momentary power interruption. -k-k-k- Has the power supply voltage dropped? (Power recovery) Is there a contact failure for MCB and/or Mg? (Replace MCB, Mg.) Is the voltage between P and N normal? (Check the voltage between P and N.) Communications error Appears if an error occurs between the Digital Operator and the Inverter. =k=k=k= Has the relay plug been inserted properly? (Check the relay plug contact.) Has the Digital Operator been inserted properly? (Check the Digital Operator contact.) ek3k6. ek3k7.
ek3k8. ek4k1. ek6k0. ek6k9. ek7k0. ek7k9.