III
4.2.39 Computer link operation (Pr. 117 to Pr. 124).................................................................................................109
4.2.40 PID control (Pr. 128 to Pr. 134) .....................................................................................................................120
4.2.41 Commercial power supply-inverter switch-over function (Pr. 135 to Pr. 139)...............................................127
4.2.42 Zero current detection (Pr. 152, Pr. 153).......................................................................................................133
4.2.43 RT signal activated condition selection (Pr. 155)...........................................................................................134
4.2.44 Stall prevention function and current limit function (Pr. 156).........................................................................134
4.2.45 OL signal output timer (Pr. 157).....................................................................................................................136
4.2.46 User group selection (Pr. 160, Pr. 173 to Pr. 176).........................................................................................137
4.2.47 Watt-hour meter clear/actual operation hour meter clear (Pr. 170, Pr. 171) ................................................138
4.2.48 Input terminal function selection (Pr. 180 to Pr. 186) ....................................................................................138
4.2.49 Output terminal function selection (Pr. 190 to Pr. 195)..................................................................................140
4.2.50 User initial value setting (Pr. 199)..................................................................................................................142
4.2.51 Cooling fan operation selection (Pr. 244) ......................................................................................................143
4.2.52 Output phase failure protection selection (Pr. 251) .......................................................................................143
4.2.53 Override bias/gain (Pr. 252, Pr. 253).............................................................................................................144
4.2.54 Advanced PID control (Pr. 500 to Pr. 516) (NA, EC versions only) ...............................................................145
4.2.55 Meter (frequency meter) calibration (Pr. 900, Pr. 901) ..................................................................................155
4.2.56 Frequency setting voltage (current) bias and gain (Pr. 902 to Pr. 905)........................................................157
4.2.57 Buzzer control (Pr. 990).................................................................................................................................162
5 PROTECTIVE FUNCTIONS 163
5.1 Errors (Alarms) ......................................................................................................................................................163
5.1.1 Error (alarm) definitions..................................................................................................................................163
5.1.2 To know the operating status at the occurrence of an alarm..........................................................................172
5.1.3 Correspondences between digital and actual characters...............................................................................172
5.1.4 Alarm code output ..........................................................................................................................................173
5.1.5 Resetting the inverter......................................................................................................................................173
5.2 Troubleshooting.....................................................................................................................................................174
5.2.1 Motor remains stopped...................................................................................................................................174
5.2.2 Motor rotates in opposite direction..................................................................................................................174
5.2.3 Speed greatly differs from the setting.............................................................................................................174
5.2.4 Acceleration/deceleration is not smooth.........................................................................................................174
5.2.5 Motor current is large......................................................................................................................................175
5.2.6 Speed does not increase................................................................................................................................175
5.2.7 Speed varies during operation........................................................................................................................175
5.2.8 Operation mode is not changed properly........................................................................................................175
5.2.9 Operation panel (FR-DU04) display is not provided.......................................................................................175
5.2.10 POWER lamp is not lit...................................................................................................................................175
5.2.11 Parameter write cannot be performed ...........................................................................................................175
5.3 Precautions for Maintenance and Inspection ........................................................................................................176
5.3.1 Precautions for maintenance and inspection..................................................................................................176
5.3.2 Check items....................................................................................................................................................176
5.3.3 Periodic inspection .........................................................................................................................................176
5.3.4 Insulation resistance test using megger .........................................................................................................177
5.3.5 Pressure test ..................................................................................................................................................177
5.3.6 Daily and Periodic Inspection .........................................................................................................................177
5.3.7 Replacement of parts .....................................................................................................................................180
5.3.8 Inverter replacement.......................................................................................................................................181
5.3.9 Measurement of main circuit voltages, currents and power ...........................................................................182
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