Is the elevator appliance suitable for all the elevators

We know many of the elevators now, after he is in use, because of the high amount of electricity he uses each time. So there are many running enterprises, he may install an elevator electric saver in the elevator, so that when the elevator is running, it will find that its running cost can be effectively controlled. But there is a problem that the enterprise needs to pay attention to.
That is, we are in the process of elevator electrical appliances procurement, is not all the elevators, can be added to such a device. Ensure that the elevator will not have any safety problems during the operation.
In fact, we will find that most of the production elevators, some of which she was originally a very electricity saving elevator. So, like this part of the elevator, you do not need to add an additional electric appliance. Because its energy efficiency itself is higher, but for some of the previous styles, such as some old elevators. We can install an electric appliance for him, and we'll find that he has a different model when it is chosen. So we should choose the elevator according to the requirements of the elevator. In this way, the elevator will not have any problems during the operation. So the elevator appliance is not universal, it also needs to be selected according to the model.