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Chapter 8 - Troubleshooting & Maintenance
8-5
8.3 Troubleshooting
Condition Check 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 (FU1-03) 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)
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 (FU1-24), 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)
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 (FU1-27, 28) 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 (FU1-25) 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 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)