Chapter 8 - Troubleshooting & Maintenance
185
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)
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