FR-A701 INSTRUCTION MANUAL (Applied) - Automation Systems ...

Check first when you have troubles5.5.3 Inverter generates abnormal noise.Check that a fan cover is correctly reinstalled when replacing a cooling fan.An AC reactor is built-in and a greater noise than at driving is produced during regeneration operation. But itis not a fault.5.5.4 Motor generates heat abnormallyIs the fan for the motor is running? (Check for accumulated dust.)Check that the load is not too heavy. Lighten the load.Check that the inverter output voltages (U, V, W) balanced.Check that the Pr. 0 Torque boost setting is correct.Was the motor type set? Check the setting of Pr. 71 Applied motor.When using any other manufacturer's motor, perform offline auto tuning. (Refer to page 171.)5.5.5 Motor rotates in opposite directionCheck that the phase sequence of output terminals U, V and W is correct.Check that the start signals (forward rotation, reverse rotation) are connected properly. (Refer to page 22)5.5.6 Speed greatly differs from the settingCheck that the frequency setting signal is correct. (Measure the input signal level.)Check that the Pr. 1, Pr. 2, Pr. 19, Calibration parameter C2 to C7 settings are correct.Check that the input signal lines are not affected by external noise.(Use shielded cables)Check that the load is not too heavy.Check that the Pr. 31 to Pr. 36 (frequency jump) settings are correct.5.5.7 Acceleration/deceleration is not smoothCheck that the acceleration and deceleration time settings are not too short.Check that the load is not too heavy.Check that the torque boost (Pr. 0, Pr. 46, Pr. 112) setting is not too large and the stall prevention function isnot activated under V/F control.5.5.8 Motor current is largeCheck that the load is not too heavy.Check that the Pr. 0 Torque boost setting is appropriate.Check that the Pr. 3 Base frequency setting is appropriate.Check that the Pr. 14 Load pattern selection setting is appropriate.Check that the Pr. 19 Base frequency voltage setting is appropriate.5.5.9 Speed does not increaseCheck that the maximum frequency (Pr. 1) setting is correct. (If you want to run the motor at 120Hz or more,set Pr. 18 High speed maximum frequency. (Refer to page 140.))Check that the load is not too heavy.(In agitators, etc., load may become heavier in winter.)Check that the torque boost (Pr. 0, Pr. 46, Pr. 112) setting is not too large and the stall prevention function isnot activated under V/F control.PROTECTIVE FUNCTIONS55.5.10 The motor and machine vibrate.Set Pr. 19 Base frequency voltage to the rated motor voltage under V/F control.Check for any mechanical looseness.391