5716075-K模块控制器
作面板电源
大多数操作面板都配有24 V DC1电源。如果您使用的电源符合安全标准且仅为操作面板供电，则没有问题。2.然而，如果你有一个24伏的装置，也为其他装置供电，有理由要谨慎。当230 V AC和24 V DC之间发生潜在短路时，操作员面板的绝缘不符合安全要求。它是4 1 2 4 3 4 5355电源230 V AC至24 V DC电源230 V交流至24 V直流电源230 V交流电至24 V电源操作面板操作面板+24 V+24 V 0 V 0 V 0V 0 V 230V AC COM1 COM100小型控制器，带扩展单元Ch0 Ch1 Ch100 Ch101距离？第7节附加安装提示安全3BSE043449R501 51假设24 V馈电是安全的，例如，根据EN 60950（防电击保护）和UL 950.3，SELV。如果24 V DC和230 V AC的继电器触点之间有很大距离，则可以对所有馈电使用相同的24 V设备。4.将24 V电源上的0 V连接到接地。这有三个优点：–安全性提高。在0 V（24 V）和230 V相之间出现故障连接或短路时，24 V馈电将不带电。–24 V馈电上的瞬态连接至接地。–没有24 V馈电相对于接地处于高电平的风险。这并不罕见，因为存在高静电。下面是一个示例，解释了为什么在较小的控制器中混合24V继电器触点和230V AC继电器触点会破坏安全的24V DC馈电。检查“24 V DC和230 V AC之间的间隙和爬电距离是否符合EN 60950或UL 950”。如果没有，在操作面板中输入一个单独的24 V装置。电流隔离第7节附加安装提示52 3BSE043449R501电流隔离操作面板对24 V直流馈电具有电流隔离，但RS232、RS422/485和USB通信端口之间没有电流隔离。只有以太网连接具有电流隔离。当PC连接到面板时，面板的内部0 V（GND）将通过PC连接到保护接地
. 许多USB设备可以将屏蔽与保护接地连接在一起。在这里，当插入USB记忆棒、键盘或类似设备时，面板的0V（GND）连接到保护接地。如果连接多个具有0V和接地连接的单元，5356内部电子滤波器DC/DC电流隔离1.5 m VCC 0 V（GND）以太网DC/AC CFL 0 V+24 V DC RS422/485 RS232 USB USB 5357*操作员面板模块化控制器PC RS422 RS232电源CPU COM COM2不相同地电位PC打印机*=内部0 V（地线）连接第7节其他安装提示电缆和总线终端RS4853BSE043449R501 53问题。接地电流通过通信电缆、控制器的后板和操作面板内部，并可能导致错误。使用外部单元改善通信并实现电流隔离。Westermo具有良好的行业标准绝缘体，也与24V直流馈电绝缘。
As panel power supply
Most operation panels are equipped with 24 V DC1 power supply. If the power supply you are using complies with safety standards and only supplies power to the operation panel, there is no problem. 2. However, if you have a 24 volt device that also supplies power to other devices, there is reason to be cautious. The insulation of the operator panel does not meet safety requirements when a potential short circuit occurs between 230 V AC and 24 V DC. It is 4 1 2 3 4 5355 power supply 230 V AC to 24 V DC power supply 230 V AC to 24 V DC power supply 230 V AC to 24 V power supply operation panel operation panel+24 V+24 V 0 V 0 V 0 V 0 V 230 V AC COM1 COM100 small controller with expansion unit Ch0 Ch1 Ch100 Ch101 Distance? Section 7 Additional installation tips Safety 3BSE043449R501 51 assumes that the 24 V feed is safe, for example, SELV according to EN 60950 (protection against electric shock) and UL 950.3. If there is a large distance between the relay contacts of 24 V DC and 230 V AC, the same 24 V equipment can be used for all feeds. 4. Connect 0 V on the 24 V power supply to ground. There are three advantages: – improved security. In the event of a faulty connection or short circuit between 0 V (24 V) and 230 V phases, the 24 V feed will be de energized. – The transient connection on the 24 V feed is to ground. – There is no risk that the 24 V feed is high relative to ground. This is not uncommon because of high static electricity. The following is an example to explain why mixing 24V relay contacts and 230V AC relay contacts in smaller controllers can disrupt the safe 24V DC feed. Check whether the clearance and creepage distance between 24 V DC and 230 V AC comply with EN 60950 or UL 950. If not, enter a separate 24 V unit in the operation panel. Additional installation tips in section 7 of current isolation 52 3BSE043449R501 current isolation operation panel has current isolation for 24 V DC feed, but there is no current isolation between RS232, RS422/485 and USB communication port. Only Ethernet connections have galvanic isolation. When the PC is connected to the panel, the internal 0 V (GND) of the panel will be connected to the protective ground through the PC
Many USB devices can connect shielding and protective grounding together. Here, when a USB memory stick, keyboard or similar device is inserted, the 0V (GND) of the panel is connected to the protective ground. If multiple units with 0V and ground connections are connected, 5356 internal electronic filter DC/DC current isolation 1.5 m VCC 0V (GND) Ethernet DC/AC CFL 0 V+24 V DC RS422/485 RS232 USB 5357 * operator panel modular controller PC RS422 RS232 power supply CPU COM COM2 different ground potential PC printer *=internal 0 V (ground wire) connection Section 7 Other installation tips cable and bus terminal RS4853BSE043449R501 53 problems. The grounding current passes through the communication cable, the back panel of the controller and the inside of the operation panel, and may cause errors. Use external units to improve communication and achieve current isolation. Westermo has a good industry standard insulator and is also insulated from 24V DC feed.
