Protective Functions Cont’d Alarm Detection Alarms are detected as a type of MxC protection function that do not operate the fault contact output. The system will automatically return to its original status once the cause of the alarm has been removed. The digital operator display flashes and the alarm is output from the multi-function outputs. 18 Alarm Display Meaning Forward/Reverse Run Commands Input TogetherEF (Flashing) EF External Fault Both the Forward and Reverse Run Commands have been on for more than 0.5 s. Control Circuit Undervoltage UV (Flashing) UV PS Undervolt The following conditions occurred when there was no run signal.
The control circuit voltage was below the undervoltage detection level setting (L2-05). The control power supply voltage was below the CUV level. Power Supply Undervoltage AUV (Flashing) AUV Power UV The power supply is below the undervoltage detection level (L2-21). 200 V class: Approx. 150 VAC 400 V class: Approx. 300 VAC Power Supply Frequency Fault FDV (Flashing) FDV Freq DEV The fluctuation in the power frequency exceeded the allowable amount. Power Supply Undervoltage FDV (Flashing) FDV Freq DEV The power supply is below the undervoltage detection level (L2-21). 200 V class: Approx. 150 VAC 400 V class: Approx.
300 VAC Power Phase Rotation Variation SRC (Flashing) SRC Power Phase Err After control power supply is on, the direction of the phase rotation changes. Control Circuit Overvoltage OV (Flashing) OV PS Overvolt The control circuit voltage exceeded the overvoltage detection level. 200 V class: Approx. 410 V 400 V class: Approx. 870 V Cooling Fin Overheating OH (Flashing) OH Heatsink Overtemp The temperature of the MxC’s cooling fins exceeded the setting in L8-02. MxC Overheating Pre-alarm OH2 (Flashing) OH2 Over Heat 2 An OH2 alarm signal (MxC overheating alarm signal) was input from a multi-function input terminal (S3 to S12).
Motor Overheating OH3 (Flashing) OH3 Motor Overheat 1 The MxC continues or stops the operation according to the setting of L1-03. Internal Resistance Overheat DOH (Flashing) DOH Dumping OH The temperature of the built-in resistor exceeded the set value. Overtorque 1 OL3 (Flashing) OL3 Overtorque Det 1 The current is greater than the setting in L6-02 for longer than the setting in L6-03. Overtorque 2 OL4 (Flashing) OL4 Overtorque Det 2 The current is greater than the setting in L6-05 for longer than the setting in L6-06. Undertorque 1 UL3 (Flashing) UL3 Undertorq Det 1 The current is less than the setting in L6-02 for longer than the setting in L6-03.
Undertorque 2 UL4 (Flashing) UL4 Undertorq Det 2 The current is less than the setting in L6-05 for longer than the setting in L6-06. Overspeed OS (Flashing) OS Overspeed Det The speed is greater than the setting in F1-08 for longer than the setting in F1-09. The PG is Disconnected PGO (Flashing) PGO PG Open The MxC is outputting a frequency, but no PG pulse is being input. Excessive Speed Deviation DEV (Flashing) DEV Speed Deviation The speed deviation is greater than the setting in F1-10 for longer than the setting in F1-11.
External Fault Detected for EF0 (Flashing) Communications Card EF0 Opt External Flt Continuing operation was specified for EF0 (F6-03=3) and an external fault was input from the option card. External Fault (Input Terminal S3) EF3 (Flashing) EF3 Ext Fault S3 An external fault was input from a multi-function input terminal.
External Fault (Input Terminal S4) EF4 (Flashing) EF4 Ext Fault S4 External Fault(Input Terminal S5) EF5 (Flashing) EF5 Ext Fault S5 External Fault (Input Terminal S6) EF6 (Flashing) EF6 Ext Fault S6 External Fault(Input Terminal S7) EF7 (Flashing) EF7 Ext Fault S7 External Fault (Input Terminal S8) EF8 (Flashing) EF8 Ext Fault S8 External Fault(Input Terminal S9) EF9 (Flashing) EF9 Ext Fault S9 External Fault (Input Terminal S10) EF10 (Flashing) EF10 Ext Fault S10 External Fault(Input Terminal S11) EF11 (Flashing) EF11 Ext Fault S11 External Fault (Input Terminal S12)EF12 (Flashing) EF12 Ext Fault S12