Diagnostics and Maintenance of Frequency Converters
When problems arise in the operation of a frequency converter, it is important to remember that faults in elements that operate in parallel with the converter can lead to failures in the entire system. This article proposes a sequence of actions for self-diagnosing and troubleshooting issues related to frequency converters.
Main Problems with Frequency Converters
Service centers often face situations where users believe that the cause of the frequency converter's failure is poor quality components. Responses from service personnel may raise additional questions and dissatisfaction among clients. This leads to incomplete information about the device's operation and its failures. Given the complexity of modern frequency converters, we will consider the main causes of their failures, excluding mechanical damage.
Fault-Finding Mechanism
The basic steps for detecting faults include:
- Conducting an initial inspection of the device;
- Cleaning from external contaminants;
- Removing oxidation from contacts;
- Checking the integrity of electrical connections;
- Analyzing the readings of line voltage and current at the input of the device;
- Checking the output voltage.
Frequency converters are sensitive to electrical disturbances. Voltage spikes can cause the device to lock up, and an error code is then recorded in memory. For accurate diagnostics, it is important to apply a systematic approach.
Preventive Maintenance of Frequency Converters
Prevention plays an important role in ensuring the uninterrupted operation of frequency converters. The main stages of maintenance include:
- External inspection of the system. It is important to eliminate contaminants, check for moisture and dust. All connections should be sealed, and it is not recommended to place the device near other sources of radiation.
- Cleaning cooling components. Dirt can cause overheating and, consequently, equipment failure.
- Checking electrical connections. Loose connections are undesirable as cyclical temperature changes can lead to their loss of reliability.
- Checking input voltage and current. The readings should be balanced; minor deviations are permissible, but their absence can lead to malfunctions.
- Checking output voltage and current readings. The output of the device should have transformed voltage, and balance should also be observed here. Incorrect readings can cause increased vibrations and reduced motor lifespan.
Regular inspection of frequency converters and adherence to preventive maintenance steps is the key to their stable operation throughout their entire lifespan.