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This post was last edited by yunrun on 2018-4-10 at 22:08. Working principle of the light oil station: http://yunrun.com.cn/upload/201603/31/201603311014473033.jpg The lubricating oil is drawn from the tank by a gear oil pump, and after passing through a check valve, a double-cylinder mesh filter, and a heat exchanger, it is delivered to various lubrication points in the equipment. Each light oil station is equipped with two oil pumps (one as a backup), and the oil pressure at the outlet of the oil pumps in the light oil station is approximately 0.2 MPa. http://yunrun.com.cn/upload/201603/31/201603311015321703.jpg Function of the thin oil station: The thin oil station is the heart of the thin oil circulation lubrication system; it forces lubricating oil to reach the friction-prone areas of the equipment, creating an oil film between the moving machine parts. This reduces friction and wear on these parts, as well as removing the heat generated by friction, thereby ensuring proper operation of the machinery and extending its service life. Applied to industrial motor bearings, classifier bearings, and bearings for large fans and mills. http://yunrun.com.cn/upload/201603/31/201603311017056391.jpg Manual system for the light oil station: Close all circuit breakers inside the control cabinet of the light oil station, and set the “Control Mode” switch SA1 on the control cabinet panel to the “Single-unit manual” position (the SA1 switch has three positions: “Single-unit manual”, “DCS control”, and “PLC control”; depending on the selected control mode, the corresponding indicator lights on the control cabinet panel – “Single-unit manual”, “DCS control” – will light up). Set the “Main pump selection” switch SA2 to either “1# Pump” or “2# Pump” (the SA2 switch has two positions: “1# Pump” and “2# Pump”; depending on the selected control mode, the corresponding indicator lights for “1# Pump” and “2# Pump” will light up). At this point, the control buttons on the panel can be used to start Pump 1#, Pump 2#, or the hot oil heater separately. The manual system is mainly used after installation to verify the rotation direction of the pump and carry out other electrical adjustments; the automatic system is generally used during normal operation. Light oil station: yunrun.com.cn/tech/413.html. Automatic system for light oil stations: When the automatic system is in operation, there are two operating modes – “DCS remote control” and “local control”. 1. Close all the circuit breakers inside the control cabinet of the light oil station. Set the “Control Mode” switch SA1 on the control cabinet panel to the “PLC Control” position (the “DCS Control Indicator” light will turn on). Set the “Main Pump Selection” switch SA2 to either “1# Pump” or “2# Pump”; the pump selected in this way will serve as the main oil pump and start operating. The PLC automatically starts and stops devices such as standby pumps and electric heating units based on signals related to oil pressure, oil level, oil temperature, etc., adjusting the operating status of the entire oil station automatically. It is also possible to monitor the operating status through the indicator lights on the control panel and DCS signals. 2. When the automatic oil pressure stabilization system for the oil pump starts operating, if the main oil pump fails or there is a leak in the oil circuit, causing the oil pressure to drop below 0.15 MPa, the backup pump will start working automatically until the oil pressure returns to normal levels, at which point it will stop operating. If the oil pressure remains low after both pumps are started, the system issues a low oil pressure alarm, prompting the staff to check for leaks or damaged oil pumps. 3. The oil tank temperature is monitored by a bimetallic thermometer with electrical contacts; when the tank temperature reaches 50°C or higher, an alarm signal is sent to the PLC, which then controls other related devices. 4. A platinum resistor is used to measure the temperature at the oil outlet of the tank; the signal is sent to a temperature controller. When the oil outlet temperature reaches 40°C or higher, an upper limit alarm is triggered, the cooler starts operating, and the alarm signal is sent to the PLC ； An upper limit alarm is triggered when the oil outlet temperature is ≥60°C; the main unit stops, and the alarm signal is sent to the PLC. 5. The oil level drops when there is a leak in the oil system, and it rises when water leaks into the oil system. The oil level high/low alarms are sent to the PLC; a low oil level triggers shutdown, while a high oil level triggers an alarm. 6. When either of the following signals is generated – motor overload, upper limit alarm for oil outlet temperature, upper limit alarm for oil level, or a pressure difference of ≥0.15 MPa across the inlet and outlet of the double-tube mesh oil filter – the PLC issues a mild fault alarm signal, and the corresponding indicator light turns on. 7. When either the low oil pressure at the oil pump outlet alarm or the low oil level alarm is triggered, the PLC sends a severe fault alarm signal and simultaneously stops the operation of the main unit. 8. When the light oil station is operating normally with no alarms, the “Light Oil Station Normal” light on the control cabinet panel will turn on, and a signal will be sent to the DCS system. 9. When the main unit is in operation, the control system of the light oil station must not be manipulated arbitrarily, to prevent accidental shutdown of the light oil station and resulting lack of lubricating oil for the main unit, which could lead to accidents. Signals from the light oil station: 1. Signals sent to the DCS system – including signals allowing remote control by the DCS (sent when the SA1 switch is in the DCS control position), signals indicating normal operation of the light oil station, signals indicating that pump No. 1 is operating, signals indicating that pump No. 2 is operating, signals indicating that the main unit is running, signals indicating minor faults in the oil system, signals indicating serious faults in the oil system, DCS drive signals, and signals indicating that the crankshaft rotation device has been disengaged. 2. Signals sent to the main unit’s high-pressure system – these include signals indicating normal operation of the oil pressure system and signals indicating serious faults in the oil station. 3. Signals sent to the PLC – these include signals indicating that power has been supplied to the light oil station, signals indicating overload of low-pressure pump No. 1, signals indicating overload of low-pressure pump No. 2, commands to start or stop the low-pressure pumps, commands to start or stop the heater, alerts regarding the upper limit of oil temperature at the pump outlet, alerts regarding an even higher upper limit for oil temperature at the pump outlet, alerts regarding the lower limit of oil level in the tank, alerts regarding the upper limit of oil level in the tank, alerts regarding the upper limit of tank temperature, alerts regarding the lower limit of oil pressure at the pump outlet, alerts regarding an even lower limit for oil pressure at the pump outlet, as well as commands for testing, silencing alarms, and pre-shutting down the main unit.