When purchasing a used frequency converter, it is crucial to ensure that it is in working condition and performs all the functions of the model as claimed. To avoid wasting money, several verification steps should be taken.
- The external inspection stage is a passive check.
- The testing stage is an active check.
Each stage consists of steps that need to be implemented before the purchase.
External inspection of the inverter
- Carefully inspect the casing for visible damage
- Check all mounting points and bolts with a screwdriver for looseness.
- Examine the contact groups for oxidation or burning, which may hinder the normal operation of the device.
- Check the cooling system (fans).
If there are no questions after the external inspection, you can proceed to the next stage - testing the device.
Operational testing
- Perform a trial start of the device to instantly identify any potential issues with the monitor and sensors.
- Check the functionality of the keyboard and ensure that data is displayed correctly on the monitor.
- Start the electric motor connected to the frequency converter and check the smoothness of starting and stopping without jerks and vibrations.
- Check the switching between different operating modes.
- Perform a trial start of the motor from the operator's panel with zero load.
By carefully carrying out the above steps, you will be able to assess the suitability of the used inverter for operation.
Is it worth buying a used inverter?
Each device has a working resource set by the manufacturer. Although some electronic devices often exceed this resource, it is still important to pay attention to the date of manufacture to know the maximum possible service life. It is worth considering both the advantages and disadvantages of purchasing a new or used inverter.
Advantages of buying a new frequency converter:
New components with a guaranteed service life, no need for comprehensive testing and reconfiguration, perfect appearance, cleanliness of electronic elements, and the cooling system.
Advantages of buying used:
The main advantage is the low price. However, used devices often have already undergone a break-in period. Service centers note that most failures occur within the first three months of operation, so a used frequency converter can be more reliable compared to a new one, even though new ones come with a warranty. However, the possibility of losing time on repairs can be critical.