Safety and Protection Devices安全及(ji)保護裝置
凍干機(ji)裝有以下安全及保(bao)護裝置，以確保(bao)設備在程序中的(de)可(ke)靠(kao)性：
如果斷電：
? 箱(xiang)體和冷阱之間的主閥位置沒有變化
? 所有其它的(de)(de)閥(fa)門都關閉以(yi)保持設(she)備內部(bu)的(de)(de)完整(zheng)性(xing)，真(zhen)空泵抽(chou)氣管(guan)上裝的(de)(de)安全閥(fa)關閉以(yi)防止真(zhen)空泄(xie)漏(lou)
? PLC 的電池(chi)可以保持儲存的信息(xi)，PLC 程序(xu)也儲存在EEPROM 中
? 來電后，程序將(jiang)從斷電時的(de)程序點重新開始其它(ta)安全裝置：
? 每個(ge)壓(ya)(ya)縮(suo)機(ji)上裝有(you)一個(ge)壓(ya)(ya)力開關，可(ke)以在(zai)排出口壓(ya)(ya)力過(guo)高時，自(zi)動(dong)斷開壓(ya)(ya)縮(suo)機(ji)
? 在制冷管路中由于溫度升(sheng)高（主要是設備停機時）會造(zao)成低壓側的壓力升(sheng)高，每(mei)臺(tai)壓縮機上都有一個低壓開關來防止壓力升(sheng)高，壓縮機自動起動并(bing)向高壓側回(hui)收(shou)制冷劑。
? 如(ru)(ru)果(guo)在(zai)升華(hua)階(jie)段，箱體真(zhen)空(kong)上(shang)升到警戒點(dian)以上(shang)，擱板(ban)加熱將(jiang)會自動切(qie)斷，如(ru)(ru)果(guo)真(zhen)空(kong)繼續(xu)上(shang)升，擱板(ban)將(jiang)開始(shi)冷卻
? 當(dang)過溫時，2 個安全溫度調節器會切斷硅油加熱器
? 如果(guo)壓差(cha)下降(jiang)，備(bei)份(fen)泵(beng)啟動，一(yi)個壓差(cha)開關(guan)監(jian)視器會(hui)監(jian)測(ce)循(xun)環泵(beng)（僅適用于雙泵(beng)系統）
? 當(dang)缺油(you)或者油(you)泵不工作(zuo)時，每(mei)臺壓縮機上的油(you)壓差開關(guan)會切斷壓縮機
? 所(suo)有的電機上都裝有D立的過載切(qie)斷開關
? 軟件中的內(nei)部(bu)自(zi)鎖程序可防止誤操作，如當箱體和冷阱在(zai)真空狀態(tai)下打開(kai)排水閥(fa)和化霜入口閥(fa)
The freeze dryer is equipped with the following safety and protection devices to ensure total process reliability:
In the event of power failure:
?The position of the main valve between the chamber and the ice condenser remains unchanged
?All other valves are closed to maintain the plant integrity. The valves in the inlet to the vacuum group are automatically closed to prevent leakage through the pumps.
?The PLC has battery backup, to ensure information is retained. The PLC program is also stored in non-volatile EEPROM memory.
?When power is re-established, the cycle is resumed from the same point where the power failure occurred
Other safety features:
?A high pressure switch on each refrigeration compressor stops the compressor in the event of high discharge pressures.
?On each compressor, a low pressure switch prevents a pressure increase in the low-pressure side of the refrigeration circuit due to any temperature increase (typically when the plant stops). The compressor automatically starts and transfers the refrigerant to its high-pressure side.
?If the chamber vacuum rises above a programmed alarm point during the sublimation sequence, shelf heating is automatically switched off. If the vacuum continues to rise thereafter, shelf cooling is initiated.
?Two safety thermostats switch off the silicone oil heater should an over-temperature condition arise.
?A differential pressure switch monitors the performance of the duty circulation pump. If the differential pressure falls the standby pump is started (only applicable for machines with two circulation pumps).
?Differential oil pressure switches on each refrigeration compressor switch off the compressor in case of lack of oil or failure of the oil pump.
?All motors are fitted with individual over current breakers.
?Software interlocks prevent miss-operation of the equipment e.g. opening drain or defrost inlet valves when the chamber and condenser are under vacuum etc.
Alarm List報警列表
ALARM LIST報(bao)警列表(biao) | |
Process Alarms 工藝(yi)報警 | Component Alarms部件報警(jing) |
Poor Vacuum – Two alarms 真空不足 – 兩個(ge)報警 | High Refrigerant Pressure 制冷劑壓力(li)高 |
High Shelf Temperature 擱板溫度高 | Low Compressor Oil Pressure 壓縮(suo)機(ji)油壓低(di) |
Low Shelf Temperature 擱板溫(wen)度低 | Low Compressed Air Pressure 壓縮空氣壓力(li)低 |
Low vacuum 低(di)真(zhen)空 | High Silicone Oil Temperature 硅油溫度高 |
Low Silicone Oil Pressure 硅(gui)油壓力低 | |
Low Cooling Water Pressure 冷卻(que)水壓力低 | |
Other depending on mc. Specification 基于指標的其它報警 | |
Note 注: The operator is notified audibly of alarms by a horn and visually by a lamp, computer screen displays. 操作者將通過(guo)聲光報警及屏幕(mu)顯示得(de)到報警通知。 | |
