MVME162使用方法教程工控DCS系统

以下指示可通过Modbus链路获得：Ramping to Idle、At Idle、Turbine in Critical Speed Band、Ramping to Rated和At Rated。除了这些指示外，怠速设定值和额定转速设定值模拟值也可用。自动启动序列当发出RUN命令时，505E会自动显示SPEED（速度）屏幕（除非与半自动启动模式一起使用），并显示Auto Start Sequence（自动启动序列）的Status（状态）（屏幕2）。速度设定点立即设置为涡轮机的实际速度，并且该顺序将从此点开始继续。该序列是自动的，但是该序列可以被暂停。可通过按下序列状态屏幕（屏幕2）上的前面板NO键、打开Halt/Continue触点（如果编程）、从Modbus通信链路选择Halt或选择Speed Setpt Raise或Lower来执行自动启动序列的停止。为了提供反馈，可以对继电器进行编程，以指示自动启动序列已停止。从序列状态屏幕（屏幕2）按下前面板YES（是）键，关闭Halt/Continue（停止/继续）触点，或从Modbus通信链路中选择Continue（继续），可以重新启动序列。表6-3列出了显示器上可能出现的自动启动状态消息及其含义。

The following indications are available through the Modbus links: Ramping to Idle, At Idle, Turbine in Critical Speed Band, Ramping to Rated, and At Rated. In addition to these indications, the Idle Speed Setpoint and Rated Speed Setpoint analog values are also available. Auto Start Sequence When a RUN command is issued, the 505E automatically displays the SPEED screen (unless used with the Semiautomatic start mode) and shows the Status of the Auto Start Sequence (screen 2). The Speed setpoint is instantly set to the turbine’s actual speed and the sequence will continue from this point. This sequence is automatic, however the sequence can be halted. Halting the Auto Start Sequence can be performed by pressing the front panel NO key from the Sequence Status screen (screen 2), opening the Halt/ Continue contact (if programmed), selecting Halt from a Modbus communications link, or selecting Speed Setpt Raise or Lower. To provide feedback, a relay can be programmed to indicate the Auto Start Sequence is Halted. The Sequence can be restarted again by pressing the front panel YES key from the Sequence Status screen (screen 2), closing the Halt/Continue contact, or selecting Continue from a Modbus communications link. Table 6-3 lists the Auto Start status messages that may appear on the display and the meanings of each.

来源：瑞昌明盛自动化设备有限公司