Tiếng Việt
Among the errors that often occur in inverters, the inverter overcurrent error is quite dangerous. So users need to consider carefully and consider before closing the circuit breaker, disconnecting the power or resetting the machine to fix the error. So what is the overcurrent fault in the inverter? What is the cause and how to fix it?
Let’s find out some possible causes of inverter overcurrent error in this article.
1 – What is an overcurrent fault inverter?
The inverter is composed of 3 current sensors (current sensors) mounted at the output to measure the signal from the inverter to the motor. There are 2 types of alarms when the current exceeds the allowable threshold: OC1 and OC2 (OC means Over Current). Depending on the type of inverter, it will be specified that the inverter code for overcurrent fault is OC1 and OC2.
Normally OC1 is used to indicate that the current is over the threshold of the inverter’s protection setting, which is the motor’s overcurrent. OC 2 is to indicate that the motor current exceeds the allowable threshold of the inverter.
We need to clearly distinguish these two types of overcurrent fault, one is motor overcurrent and the other is inverter overcurrent. This is an error that occurs only when you power on the inverter or during motor running.
When the inverter has an overcurrent fault, it is necessary to first check the hardware, the parameters of the inverter and the motor. Because if you reset the error to run again immediately, it will damage or explode the inverter and motor.
2 – Causes and solutions when the inverter shows an overcurrent error
Here are some causes of inverter overcurrent error:
2.1 – The inverter gives an OC error when the power is turned on:
There is a high possibility that the inverter has a damaged current sensor when you just turn on the power, it has reported an OC error, so the signal feedback to the inverter is wrong. In addition, it is also impossible to exclude the possibility that the current sensor’s lead to the control board is disconnected.
If the inverter is old, it may be that the jack of the current sensor is not good, then it is necessary to check and clean the jack to see if the error can be fixed.
2.2 – The inverter gives an OC error when just pressing Run:
Every time you press the Run command, the inverter reports an OC error, it is likely that the output power of the inverter is damaged. Then you need to measure the output IGBT to see if there is a short circuit. If so, the output power must be replaced. This case can also be caused by the wrong motor wiring and the output is short-circuited.
2.3 – OC inverter error while starting up
If during start-up the inverter gives an error, it is related to the load and current capacity of the inverter. At this time, it is necessary to check the nameplate of the motor and the inverter to see if they are compatible with each other. Also, check to see if the motor is loaded or has a mechanical problem. To overcome the inverter overcurrent error in this case is to set the acceleration and deceleration time of the inverter to be longer.
3 – Notes when using the inverter as follows:
To avoid problems with the inverter, you also need to pay attention to these things during use:
+ It is recommended to install the device in a place with humidity, temperature and a cool location.
+ Should choose equipment corresponding to the machine and application to save costs and ensure safe operation.
+ Should choose the type of inverter suitable for the climate of your area because the inverter is very sensitive to hot and humid climate.
+ Read the instructions carefully before use, when unsure, do not change the parameters or repair the device yourself.
+ It is necessary to pay attention and keep in mind when technical experts guide the installation and installation of inverter equipment, to ensure that it can be applied well in actual operation.
Thus, VPIC has answered your questions about the inverter reporting an overcurrent fault. Hopefully, the above sharing will help you ensure the working capacity and successfully overcome common errors in the inverter.
