欣谕大型冻干机的控制系统是怎么实现精度高控制的

欣谕冻干机控制系统是通过可校正的信号传送器，控制元件通过可校验信号变送器直接连接到PLC 的输入模拟器上，信号至少包括硅油入口温度、箱体真空以及SIP 设备的排出口温度和箱体压力。这些4-20ma 信号同时也通过电流回路连接到记录仪上，所有其它的模拟数据也传送到记录仪上，在记录仪中模拟数据转化为数字格式，并被传送到PLC 用于显示在SCADA。

Critical control instruments are connected directly to 4-20 mA PLC analogue inputs, via signal transmitters. Signal calibration may be performed at the transmitter or via software in the SCADA system. These are as a minimum: the fluid inlet temperature, chamber vacuum, and the drain temperatures and chamber pressure for steam machines. These 4-20 mA signals are also connected via a current loop to the recorder. All other analogue process data is transmitted to the recorder where it is converted into a digital format and re-transmitted to the PLC for display on the SCADA.

Control Cabinet控制柜

控制柜D立放置。所有主要的控制元件都安装在控制柜内。

The control cabinet is free standing. All the main control components are installed within the control cabinet. 

Programmable Logic Controller (PLC) 可编程序控制器 (PLC) 

控制系统基于OMRON PLC。

通过PLC 控制冻干机。PLC 直接控制冻干机的所有功能。根据存储到存储器中的工艺参数和程序，PLC 可以完成整个生产系统的操作。

存储在PLC 存储器中的程序可以控制所有的功能，如：半自动和全自动冻干和除霜。在冻干过程中，PLC 可比例控制板层温度和箱体真空。

The Lyomax Compact control system is based on an Omron PLC.

Machine control is performed by the PLC. The PLC directly controls all the machine’s functions. According to process and plant data and the program downloaded to its memory, the PLC activates the outputs to properly operate the plant’s systems.

The program stored in the PLC’s memory is able to safely control all the functions such as semi-automatic and automatic freeze drying and defrosting. The PLC provides proportional control for the shelf temperature and digital control chamber vacuum during freeze-drying.  

Sterile Room Control Panel无菌间控制面板

1 个锻面抛光的不锈钢控制面板安装在无菌区靠近冻干机门的墙上。控制面板用于：

• 箱体照明

• 向冻干箱内输入空气或氮气

• 液压压塞系统操作（如安装）

• 打开箱体排出阀

• 当冻干机内压力大于大气压时，数字显示压力值

A satin finish stainless steel panel is supplied for fitting in the sterile area wall adjacent to the Lyophilizer door. Within the panel are mounted controls for:

•Activating the chamber illumination

•Admitting air/selected gas to the chamber

•Operating the hydraulic stoppering system (where fitted)

•Opening the chamber drain valve

•Digital pressure display, when the freeze dryer operates above atmospheric pressure.