Safety and Protection Devices安全及保護(hù)裝置
凍干機(jī)裝有以下安全及保護(hù)裝置，以確保設(shè)備在程序中的可靠性：
如果斷電：
? 箱體和冷阱之間的主閥位置沒(méi)有變化
? 所有其它的閥門都關(guān)閉以保持設(shè)備內(nèi)部的完整性，真空泵抽氣管上裝的安全閥關(guān)閉以防止真空泄漏
? PLC 的電池可以保持儲(chǔ)存的信息，PLC 程序也儲(chǔ)存在EEPROM 中
? 來(lái)電后，程序?qū)臄嚯姇r(shí)的程序點(diǎn)重新開始其它安全裝置：
? 每個(gè)壓縮機(jī)上裝有一個(gè)壓力開關(guān)，可以在排出口壓力過(guò)高時(shí)，自動(dòng)斷開壓縮機(jī)
? 在制冷管路中由于溫度升高（主要是設(shè)備停機(jī)時(shí)）會(huì)造成低壓側(cè)的壓力升高，每臺(tái)壓縮機(jī)上都有一個(gè)低壓開關(guān)來(lái)防止壓力升高，壓縮機(jī)自動(dòng)起動(dòng)并向高壓側(cè)回收制冷劑。
? 如果在升華階段，箱體真空上升到警戒點(diǎn)以上，擱板加熱將會(huì)自動(dòng)切斷，如果真空繼續(xù)上升，擱板將開始冷卻
? 當(dāng)過(guò)溫時(shí)，2 個(gè)安全溫度調(diào)節(jié)器會(huì)切斷硅油加熱器
? 如果壓差下降，備份泵啟動(dòng)，一個(gè)壓差開關(guān)監(jiān)視器會(huì)監(jiān)測(cè)循環(huán)泵（僅適用于雙泵系統(tǒng)）
? 當(dāng)缺油或者油泵不工作時(shí)，每臺(tái)壓縮機(jī)上的油壓差開關(guān)會(huì)切斷壓縮機(jī)
? 所有的電機(jī)上都裝有D立的過(guò)載切斷開關(guān)
? 軟件中的內(nèi)部自鎖程序可防止誤操作，如當(dāng)箱體和冷阱在真空狀態(tài)下打開排水閥和化霜入口閥
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(bào)警列表
ALARM LIST報(bào)警列表 | |
Process Alarms 工藝報(bào)警 | Component Alarms部件報(bào)警 |
Poor Vacuum – Two alarms 真空不足 – 兩個(gè)報(bào)警 | High Refrigerant Pressure 制冷劑壓力高 |
High Shelf Temperature 擱板溫度高 | Low Compressor Oil Pressure 壓縮機(jī)油壓低 |
Low Shelf Temperature 擱板溫度低 | Low Compressed Air Pressure 壓縮空氣壓力低 |
Low vacuum 低真空 | High Silicone Oil Temperature 硅油溫度高 |
Low Silicone Oil Pressure 硅油壓力低 | |
Low Cooling Water Pressure 冷卻水壓力低 | |
Other depending on mc. Specification 基于指標(biāo)的其它報(bào)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(guò)聲光報(bào)警及屏幕顯示得到報(bào)警通知。 | |
