How to replace the frequency converter with the same model?

In our era, variable-frequency drive (VFD) is the standard of motor control. Because they are mainly installed in commercial and industrial buildings, new and old applications can benefit from these intelligent devices. However, like all electronic devices, it is impossible to use them forever.

For example, it may need to be replaced or upgraded due to the surge fault, or the service life is exceeded, which is incompatible with the management system. Remote monitoring is very important for this application. In either case, replacing VFD is not as simple as just replacing a unit, powering on and leaving.

On the other hand, when you know what to look for and how to perform the task correctly, the task itself can actually be very simple.

Replace with the same model.

It sounds simple, but there are several things to be confirmed when replacing VFD with the same model. The first task is to match the model, voltage level and current/horsepower rating of the two equipment. This can also verify whether the new VFD is suitable for the existing physical space. Next, all wiring must be connected to the same terminal name. This ensures that the new VFD has the same I/O function as the old VFD. Finally, the parameter settings should match the key settings of the application.

There are many forms of backup, especially when the old VFD can still be started. If you can access it, you can write down the parameter settings, save them in the software program, or even save them in the memory of the keypad, and then transfer them to the new VFD. Ideally, this should be done before the replacement process begins. If VFD is installed in a larger device, the OEM may have its own parameter table. In the worst case, the user must manually set the VFD

It may be beneficial to retain some parts of the old VFD. According to the severity of VFD failure, some components (such as keyboard, cooling fan and control/terminal board) can be reused if they are not damaged. Do not retain the main circuit components (including capacitance) of the VFD, as this may cause internal damage or greater wear.