6-3
Chap. 6 TROUBLESHOOTING
6.2 Before Proceeding with Troubleshooting
If any of the protective functions has been activated, first remove the cause. Then, after checking that the all run commands
are set to OFF, release the alarm. If the alarm is released while any run commands are set to ON, the inverter may supply the
power to the motor, running the motor.
Injury may occur.
- Even if the inverter has interrupted power to the motor, if the voltage is applied to the main circuit input terminals L1/R,
L2/S and L3/T, voltage may be output to inverter output terminals U, V, and W.
- Turn OFF the power and wait at least five minutes for inverters with a capacity of 22 kW or below, or at least ten
minutes for inverters with a capacity of 30 kW or above. Make sure that the LED monitor and charging lamp are
turned OFF. Further, make sure, using a multimeter or a similar instrument, that the DC link bus voltage between the
terminals P (+) and N (-) has dropped to the safe level (+25 VDC or below).
Electric shock may occur.
Follow the procedure below to solve problems.
(1) First, check that the inverter is correctly wired, referring to Chapter 2, Section 2.3.4 "Wiring of main circuit terminals and
grounding terminals."
(2) Check whether an alarm code or the "light alarm" indication (
l-al
) is displayed on the LED monitor.
z If neither an alarm code nor "light alarm" indication (
l-al
) appears on the LED monitor
Abnormal motor operation Go to Section 6.3.1.
[1] The motor does not rotate.
[2] The motor rotates, but the speed does not increase.
[3] The motor runs in the opposite direction to the command.
[4] Speed fluctuation or current oscillation (e.g., hunting) occurs during
running at constant speed.
[5] Grating sound is heard from the motor or the motor sound fluctuates.
[6] The motor does not accelerate or decelerate within the specified time.
[7] The motor does not restart even after the power recovers from a
momentary power failure.
[8] The motor abnormally heats up.
[9] The motor does not run as expected.
Problems with inverter settings Go to Section 6.3.2.
[1] Nothing appears on the LED monitor.
[2] The desired menu is not displayed.
[3] Data of function codes cannot be changed.
z If an alarm code appears on the LED monitor Go to Section 6.4.
z If the "light alarm" indication (
l-al
) appears on the LED monitor Go to Section 6.5.
z If an abnormal pattern appears on the LED monitor Go to Section 6.6.
while neither an alarm code nor "light alarm" indication (
l-al
) is displayed
If any problems persist after the above recovery procedure, contact your Fuji Electric representative.
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