YASKAWA Varispeed-606PC3 Instruction Manual

1 . VS-606PC3 INVERTER MAIN UNIT (Cont1 d)Table 1 .11 Motor Faults and CorrectiVE. Actions (Cont'd)* Because of motor and load (geared machine) characteristics, motor r/min becomesunstable or motor current apples . To correct these problems, changing the invertercontrol constants may be effective Refer to "CONSTANTS EFFECTIVE FORREDUCTION OF MACHINE VIBRATION OR SHOCK" on page 129 for details of controlconstants to be changed.Fault Check Point ' Corrective ActionWiring of frequency setting Correct the wiring.circuit is correct.Motor rotates butvariable speed is Operation (method selection) Check operation method;;election mode [constant (No.not available. mode setting is correct. 01)) by digital operator .Load is not excessively large. Reduce the load.Motor ratings (number of Check the specifications andpoles, voltage) are proper . nameplate.Motor r/min is too Maximum frequency set value Check the maximum frequencyhigh (low). is correct. set value (constant (No.02))Voltage between motor terminals check V/f characteristic setis not excessively reduced. (Use value [constant (No 02 to 08)).rectifier type voltage.)Load is not excessively large Reduce the load .Load variation is not Reduce the load variationIncrease the inverter or motorMotor r/min is not excessively large. capacity.stable duingoperation* 3-phase power supply is used Reconnect properly to preventThere is no open phase open phase.Single-phase power supply is Connect an AC reactor to theused. power supply.