9 TroubleshootingYASKAWA SIEP C730600 86F MECHATROLINK-II Technical Manual 39ALRM Code (Hex.) Keypad Display Description0C oL2 Drive Overload0D oL3 Overtorque Detection 10E oL4 Overtorque Detection 20F rr Dynamic Braking Transistor Fault10 rH Braking Resistor Overheat11 EF3 External Fault (Terminal S3)12 EF4 External Fault (Terminal S4)13 EF5 External Fault (Terminal S5)14 EF6 External Fault (Terminal S6)15 EF7 External Fault (Terminal S7)16 EF8 External Fault (Terminal S8)18 oS Overspeed19 dEv Speed Deviation1A PGo Encoder (PG) Feedback Loss1B PF Input Phase Loss1C LF Output Phase Loss1D oH3 Motor Overheat (PTC Input)1E oPr Keypad Connection Fault1F Err EEPROM Write Error20 oH4 Motor Overheat Fault (PTC Input)21 CE Modbus Communication Error25 CF Control Fault26 SvE Zero Servo Fault27 EF0 Option Card External Fault28 FbL PID Feedback Loss29 UL3 Undertorque Detection 12A UL4 Undertorque Detection 22B oL7 High Slip Braking Overload32 dv1 Z Pulse Fault33 dv2 Z Pulse Noise Fault Detection34 dv3 Inversion Detection35 dv4 Inversion Prevention Detection36 LF2 Output Current Imbalance37 SToMotor Step-Out DetectedNote:When using YASKAWA AC Drive GA500, GA700, GA800, CR700, and CH700, STPo [Motor PullOut or Step Out Detection] will be displayed.38 PGoH Encoder (PG) Hardware Fault3B SEr Speed Search Retries Exceeded41 FbH Excessive PID Feedback42 EF1 External Fault (Terminal S1)43 EF2 External Fault (Terminal S2)44 oL5 Mechanical Weakening Detection 145 UL5 Mechanical Weakening Detection 246 CoF Current Offset Fault49 dWFL DriveWorksEZ Fault4A dWF1 EEPROM Memory DWEZ Data Error4D voF Output Voltage Detection Fault