Manual - Famco

Chapter 8 - Troubleshooting & Maintenance8.3 TroubleshootingConditionThe Motor Does NotRotate.The Motor Rotatesin OppositeDirections.The DifferenceBetween theRotating Speed andthe Reference isToo Large.The Inverter DoesNot Accelerate orDecelerateSmoothly.The Motor Currentis Too High.The Rotating SpeedDoes Not Increase.The Rotating SpeedOscillates When theInverter isOperating.Check Point1) Main circuit inspection:☞ Is the input (line) voltage normal? (Is the LED in the inverter is lit?)☞ Is the motor connected correctly?2) Input signal inspection:☞ Check the operating signal input to the inverter.☞ Check the forward and the reverse signal input simultaneously to the inverter?☞ Check the command frequency signal input to the inverter.3) Parameter setting inspection:☞ Is the reverse prevention (FU1-03) function set?☞ Is the operation mode (FU1-01) set correctly?☞ Is the command frequency set to 0?4) Load inspection:☞ Is the load too large or is the motor jammed? (Mechanical brake)5) Other:☞ Is the alarm displayed on the keypad or is the alarm LED lit? (STOP LED blinks)☞ Is the phase sequence of the output terminal U, V, W correct?☞ Is the starting signal (forward/reverse) connected correctly?☞ Is the frequency reference signal correct? (Check the level of the input signal)☞ Is the following parameter setting is correct?Lower Limit Frequency (FU1-24), Upper Limit Frequency (FU1-25), Analog Frequency Gain (I/O-1~10)☞ Is the input signal line influenced by external noise? (Use a shielded wire)☞ Is the acceleration/deceleration time is set too short a period of time?☞ Is the load too large?☞ Is the Torque Boost (FU1-27, 28) value is too high that the current limit function and the stall preventionfunction do not operate?☞ Is the load too large?☞ Is the Torque Boost Value (manual) too high?☞ Is the Upper Limit Frequency (FU1-25) value correct?☞ Is the load too large?☞ Is the Torque Boost (FU1-27, 28) value too high that the stall prevention function (FU1-59, 60) does notoperate?1) Load inspection:☞ Is the load oscillating?2) Input signal inspection:☞ Is the frequency reference signal oscillating?3) Other:☞ Is the wiring too long when the inverter is using V/F control? (over 500m)185