Chapter 7 - Troubleshooting & Maintenance
7-5
7.3 Troubleshooting
Condition Checking Point
The Motor Does Not
Rotate.
1) 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 (FU1-01) function set?
Is the Drive mode (DRV-03) 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)
The Motor Rotates in
Opposite Directions.
Is the phase sequence of the output terminal U, V, W correct?
Is the starting signal (forward/reverse) connected correctly?
The Difference Between
the Rotating Speed and the
Reference is Too Large.
Is the frequency reference signal correct? (Check the level of the input signal)
Is the following parameter setting is correct?
Lower Limit Frequency (FU1-34), Upper Limit Frequency (FU1-35), Analog
Frequency Gain (I/O-1~10)
Is the input signal line influenced by external noise? (Use a shielded wire)
The Inverter Does Not
Accelerate or Decelerate
Smoothly.
Is the acceleration/deceleration time is set too short a period of time?
Is the load too large?
Is the Torque Boost (FU2-68, 69) value is too high that the current limit
function and the stall prevention function do not operate?
The Motor Current is Too
High.
Is the load too large?
Is the Torque Boost Value (manual) too high?
The Rotating Speed Does
Not Increase.
Is the Upper Limit Frequency (FU1-35) value correct?
Is the load too large?
Is the Torque Boost (FU1-68, 69) value too high that the stall prevention
function (FU1-70, 71) does not operate?
The Rotating Speed
Oscillates When the
Inverter is Operating.
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)
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