Reasons and solutions for overheating and overload faults in frequency converters

Reasons and solutions for overheating and overload faults in frequency converters:

Fault phenomenon one: ABB frequency converter repair overheating (OH): It is also a common fault.

1. The main causes of the malfunction are: high ambient temperature, blocked rotation of the fan, poor performance of the temperature sensor, and overheating of the motor.

2. Example: A customer reported that an AMB 22kW frequency converter experienced a "OH" jump after running for about half an hour. Analysis and Maintenance: As the malfunction occurred after a period of operation, the likelihood of the temperature sensor malfunctioning is low.

3. Fault handling: The temperature of the frequency converter was indeed too high. After powering on, it was found that the fan was rotating slowly and the protective cover was filled with a lot of cotton fluff (because the frequency converter is used in the textile industry). After cleaning, the fan was turned on and operated well. After running for several hours, there was no recurrence of this fault.   

Fault phenomenon 2: Overload: It is also one of the faults where the frequency converter jumps frequently

1. Reason for malfunction: When we see overload phenomena, we should first analyze whether it is motor overload or the overload of the inverter itself. Generally speaking, motors have strong overload capacity, and as long as the motor parameters in the inverter parameter table are set properly, motor overload is unlikely to occur.

2. Fault handling: The frequency converter itself is prone to overload alarms due to its poor overload capacity We can detect the output voltage of the frequency converter.

The following are the troubleshooting methods for Mitsubishi inverter overheating:

Is the ambient temperature of E · OH too high

Yes -- → Reduce the ambient temperature

↓ No

Is the fan damaged

Yes -- → Replace the fan or seek technical support

↓ No

Is the air duct blocked

Yes -- → Clean the air duct

↓ No

Seeking technical support