Hao Phuong would like to send to customers solutions for some errors related to overcurrent, over voltage or phase loss on Fuji Electric inverters. Hope these helpful information will help you solve the problem, use inverter more effectively.
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Table of Contents Hide
Overcurrent – OC 1
|
Possible causes |
checking and fixing |
1 |
The output is short-circuited |
-Remove the terminal (U, V, W) from the inverter output, check the resistance between phases, check when the resistor is too low. |
2 |
Mass loss from inverter output |
Remove the terminal (U, V, W) from the inverter output, check with MegaOhm gauges.. |
3 |
Loading too heavy |
Check the motor line with the test device, record the signal type. |
4 |
The acceleration or deceleration time is too short |
Check whether the motor start has enough torque during acceleration or deceleration. |
5 |
Large noise signal caused error to the inverter |
Checki the installation of the inverter in accordance with the working environment conditions. |
6 |
Invalid motor parameter settings. |
Check the motor parameter function. |
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Overvoltage – OV 1
|
Possible causes |
checking and fixing |
1 |
The input source is larger than the motor parameters. |
Check input voltage. |
2 |
Due to an interference pulse affecting the source |
The power supplied by the filter capacitor when turned off or opened or when the thyristor is switched off may cause interference with the input source. |
3 |
Deceleration time is too short in combination with load |
Recalculate the braking time from load parameters and braking torque. |
4 |
Overload capacity. |
Compare the braking torque of the load with the inverter. |
5 |
Large noise signal causing error to the drive
|
Check the installation of the inverter in accordance with the working environment conditions |
6 |
Could not connect the resistor
|
Check if the braking resistor attached to the drive is correct. The braking resistor is attached to the terminal (P +) and (BD) |
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Undervoltage – LU
|
Possible causes |
checking and fixing |
1 |
Instant error |
Reset the inverter. |
2 |
The voltage of the source does not match the parameters of the inverter |
Check the input |
3 |
The circuit is faulty or the connection is faulty. |
Check input and output |
4 |
Pressure drop due to external load |
Check the input voltage and check the voltage variation. |
5 |
The starting current of the motor causes a voltage drop due to insufficient power. |
Check input voltage, check capacitor |
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Input phase loss – L in
|
Possible causes |
checking and fixing |
1 |
The power cord is broken. |
Check input. |
2 |
The terminal screw of the power and inverter circuit has not been tightened yet |
Check and tighten the screw. |
3 |
An imbalance between three-phase or three-phase voltage is too large. |
Check input voltage |
4 |
Overload often occurs. |
Check the ripple of the rectifier circuit. |
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