6.2 Before Proceeding with Troubleshooting
6-3
6.2 Before Proceeding with Troubleshooting
• If any of the protective functions has been activated, first remove the cause. Then, after checking that all run
commands are set to OFF, release the alarm. If the alarm is released while any run command is set to ON,
the inverter may supply the power to the motor, running the motor.
Failure to observe this could result in injury.
• Even if the inverter cuts off the supply of power to the motor, if voltage is being applied to main power supply
input terminals L1/R, L2/S, and L3/T, voltage may be output to inverter output terminals U, V and W.
• Carry out an inspection after first waiting for at least 5 minutes for units of FRN0115G2S-2G/FRN0060G2■
-4G or below, or 10 minutes for units of FRN0146G2S-2G/FRN0075G2■-4G or above after turning off the
power, ensuring that the LED monitor and charge lamp are off, and using a device such as a tester to ensure
that the DC intermediate circuit voltage across main circuit terminals P(+)-N(-) has dropped to a safe level
(+25 VDC or less).
Failure to observe this could result in electric shock.
Follow the procedure below to solve problems.
(1) Is wire connection correct?
See Chapter 2 “2.2.1 Basic connection diagram”.
(2) Check whether an alarm code or warning code is displayed on the LED monitor.
● If an Alarm Code Appears on the LED Monitor To section 6.3
● If a Warning Code is Displayed To section 6.4
● Other Errors
Abnormal motor operation To section 6.5.1
6.5.1 [ 1 ] The motor does not rotate
6.5.1 [ 2 ] The motor rotates, but the speed does not increase
6.5.1 [ 3 ] The motor runs in the opposite direction to the command
6.5.1 [ 4 ] Speed fluctuation or current oscillation (e.g., hunting) occurs during running at constant
speed
6.5.1 [ 5 ] Unpleasant noises are emitted from motor or noises fluctuate
6.5.1 [ 6 ] Motor is not accelerated or decelerated according to set-up acceleration or deceleration
times
6.5.1 [ 7 ] The motor does not restart even after the power recovers from a momentary power failure
6.5.1 [ 8 ] Motor generates heat abnormally
6.5.1 [ 9 ] The motor does not run as expected
6.5.1 [ 10 ] Motor stalls during acceleration
Problems with inverter settings To section 6.5.2
6.5.2 [ 1 ] Nothing appears on the keypad
6.5.2 [ 2 ] The desired menu is not displayed
6.5.2 [ 3 ] Display of under bars (_____)
6.5.2 [ 4 ] Display of center bars (
-----
)
6.5.2 [ 5 ] [ ] Display of parenthesis
6.5.2 [ 6 ] Data of function codes cannot be changed
6.5.2 [ 7 ] Function code data are not changeable (change from link functions)
If any problems persist after the above recovery procedure, contact your Fuji Electric representative.
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