4.2.39 Computer link operation (Pr. 117 to Pr. 124) ................................................................................................. 111

4.2.40 PID control (Pr. 128 to Pr. 134) ..................................................................................................................... 122

4.2.41 Commercial power supply-inverter switch-over function (Pr. 135 to Pr. 139) ............................................... 129

4.2.42 Zero current detection (Pr. 152, Pr. 153) ....................................................................................................... 135

4.2.43 RT signal activated condition selection (Pr. 155)........................................................................................... 136

4.2.44 Stall prevention function and current limit function (Pr. 156) ......................................................................... 136

4.2.45 OL signal output timer (Pr. 157)..................................................................................................................... 138

4.2.46 User group selection (Pr. 160, Pr. 173 to Pr. 176)......................................................................................... 139

4.2.47 Watt-hour meter clear/actual operation hour meter clear (Pr. 170, Pr. 171) ................................................ 140

4.2.48 Input terminal function selection (Pr. 180 to Pr. 186) .................................................................................... 140

4.2.49 Output terminal function selection (Pr. 190 to Pr. 195).................................................................................. 142

4.2.50 User initial value setting (Pr. 199).................................................................................................................. 144

4.2.51 Cooling fan operation selection (Pr. 244) ...................................................................................................... 145

4.2.52 Output phase failure protection selection (Pr. 251) ....................................................................................... 145

4.2.53 Override bias/gain (Pr. 252, Pr. 253) ............................................................................................................. 146

4.2.54 Advanced PID control (Pr. 500 to Pr. 516) (NA, EC versions only) ............................................................... 147

4.2.55 Meter (frequency meter) calibration (Pr. 900, Pr. 901) .................................................................................. 158

4.2.56 Frequency setting voltage (current) bias and gain (Pr. 902 to Pr. 905) ........................................................ 160

4.2.57 PU buzzer control (Pr. 990) ........................................................................................................................... 165

5 PROTECTIVE FUNCTIONS

5.1 Errors (Alarms) ...................................................................................................................................................... 166

5.1.1 Error (alarm) definitions .................................................................................................................................. 166

5.1.2 To know the operating status at the occurrence of an alarm.......................................................................... 175

5.1.3 Correspondences between digital and actual characters ............................................................................... 175

5.1.4 Alarm code output .......................................................................................................................................... 176

5.1.5 Resetting the inverter...................................................................................................................................... 176

5.2 Troubleshooting..................................................................................................................................................... 177

5.2.1 Motor remains stopped ................................................................................................................................... 177

5.2.2 Motor rotates in opposite direction.................................................................................................................. 177

5.2.3 Speed greatly differs from the setting ............................................................................................................. 177

5.2.4 Acceleration/deceleration is not smooth......................................................................................................... 177

5.2.5 Motor current is large...................................................................................................................................... 178

5.2.6 Speed does not increase................................................................................................................................ 178

5.2.7 Speed varies during operation........................................................................................................................ 178

5.2.8 Operation mode is not changed properly........................................................................................................ 178

5.2.9 Operation panel (FR-DU04) display is not provided ....................................................................................... 178

5.2.10 POWER lamp is not lit ................................................................................................................................... 178

5.2.11 Parameter write cannot be performed ........................................................................................................... 178

5.3 Precautions for Maintenance and Inspection ........................................................................................................ 179

5.3.1 Precautions for maintenance and inspection.................................................................................................. 179

5.3.2 Check items .................................................................................................................................................... 179

5.3.3 Periodic inspection ......................................................................................................................................... 179

5.3.4 Insulation resistance test using megger ......................................................................................................... 180

5.3.5 Pressure test .................................................................................................................................................. 180

5.3.6 Daily and Periodic Inspection ......................................................................................................................... 180

5.3.7 Replacement of parts ..................................................................................................................................... 183

5.3.8 Inverter replacement....................................................................................................................................... 184

5.3.9 Measurement of main circuit voltages, currents and power ........................................................................... 185

III

166

Table of Contents