![]() ![]() However, there are some problems there, too. Serial communication between two devices seems the best way. The devices can share their data via serial bus to improve their control on the system. The lift controller can manage the lift travel much better by having the actual speed and braking distance information supplied by the reverse. Once the two devices can communicate, they can share data, which increases their control over the motor and shaft. Otherwise, they cannot understand each other. Two devices must support the same protocol that is, speak the same language. ![]() When the communication channel is set up, the next problem is the protocol. While most controllers and drivers have serial ports, they do not all support the same standard. Vices with identical serial standards, such as CAN or RS485, and identical data structures. In theory, it seems very easy to share information in practice, however, it is not so easy. Any data can be transferred to the other device, provided that the other device can use or understand it. All of the information and commands between two devices are transmitted via the serial connection. In serial connection, only the serial communication terminals are connected between the controller and the motor driver (Figure 3). It needs neither a protocol nor communication channel setup. On the other hand, all controllers and motor drivers support parallel connection, the simplest way to connect a controller and motor driver. Only information that says the “speed is above or below a set value,” but not the value of the speed, can be sent. For example, the actual speed cannot be sent to the controller in numeric format by the reverse. Moreover, you cannot use a function unless it has been already implemented in both devices, and you cannot transfer numeric data in a parallel connection, since one terminal can carry only one-bit data. Furthermore, the output and input functions supplied by the controller and motor driver vary according to the brand or model of the device selected. Therefore, there is a physical limit to the channels that can be implemented between these two devices, and the device with the fewest terminals sets this limit. In parallel mode, each command or information requires one input in the first device, one output in the other device and wiring between them. In parallel mode, outputs of one device are connected to the inputs of the other device and vice-versa. This communication can be in parallel or in serial connection. There may be much more data flowing there, but these are the basic commands and information. The controller sends travel speed, direction and enable signal to the driver, and the driver sends the actual speed and device status to the controller. The simplest information flow between controller and driver is shown in Figure 2. Communication Between Controller and Motor Driver The motor driver generates voltage to rotate the motor at the desired speed. ![]() It only gets commands from the controller it gets speed and rotor position from the motor. ![]() The motor driver knows nothing about the shaft. The basic parts of the lift control system are shown in Figure 1.Īll of the shaft information, including car position, comes to the lift controller. The job of the motor driver is only to accomplish the motor rotation according to the commands of the controller. The motor driver behaves as a slave, and the lift controller acts as a manager. Any motion request is evaluated by the controller by sending appropriate commands to the motor driver. The lift controller board collects all of the information in the shaft and sends commands and manages the motor driver, as well as other units in the lift system. Other elements in a lift controller box are switching, wiring and limiting elements. Electric Lift ControllerĪ lift controller has two main units: the lift controller electronic board and the motor driver. In order to understand the transition to the integrated devices, we should first take a look at the communication of the lift controller and motor driver. In this article, we will try to explain the structures of the integrated lift controllers, as well as the changes introduced by them. At first glance, this new trend may appear to be a matter of only simplifying the lift controller wiring, but there is much more changed by the presence of the integrated lift controllers. For more information on November 2019’s event in Las Vegas and to participate, visit An integrated lift control system consists of a lift controller and a motor driver combined into one device. This article was first presented at the 2018 International Elevator & Escalator Symposium in Istanbul. Combining controller with motor driver in one unit offers much more than just simplicity. ![]()
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