LS SV-xxx-iP5A-2 - Troubleshooting

Chapter 6 – Troubleshooting and Maintenancet
6-7
6.2 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 (FU1-71) 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)