Oil Purifier PLC Control Panel Operating Instructions

Writer： Kaiqian Oil Purifier Release time：2026-11-10 14:17 Clicks：

The PLC control panel is the operating center of an oil purifier. It coordinates the feed pump, heating system, vacuum system, filtration stages and discharge pump according to the selected operating mode. Because button names and screen layouts vary by model, operators should always follow the machine manual and use the actual process status shown on the panel rather than relying only on indicator lights.

Understand the Main Control Functions

Most oil purifier PLC panels include a touch screen or control buttons for power, emergency stop, automatic operation, manual operation, pump control, heating control, vacuum control and alarm reset. The screen normally displays oil temperature, vacuum status, pump running condition, filter pressure or differential pressure, liquid level and fault messages.

Automatic mode is generally used for normal oil purification after the machine has been connected correctly. Manual mode is mainly intended for commissioning, inspection and maintenance. In manual mode, each pump, valve or heater may be operated separately, so incorrect operation can cause dry running, excessive pressure, overheating or vacuum instability.

Pre-Start Checks

Before pressing the start button, confirm that the oil inlet and outlet hoses are connected to the correct ports and that all necessary valves are open. Check that the treated oil tank has sufficient capacity and that the feed tank contains enough oil for continuous circulation. Hoses should be clean, firmly connected and suitable for the oil temperature and operating pressure.

• Check the power supply, grounding and emergency stop position.

• Confirm that the filter elements are installed correctly and that the filter housing is closed.

• Make sure the vacuum tank, heating chamber and oil passages are free from obvious leaks.

• Check the oil level and ensure that the pump will not run without oil.

• Verify that the oil type and treatment target are suitable for the purifier.

Do not start the heater before oil circulation is established unless the equipment manual specifically allows this sequence. Heating an empty chamber can damage the heater and may create a fire hazard.

Recommended Automatic Operation Sequence

1. Switch on the main power and check the PLC screen for active alarms.

2. Open the required inlet, outlet and bypass valves according to the piping arrangement.

3. Start the feed or oil circulation pump and confirm that oil is flowing normally.

4. Start the vacuum system when the oil level and circulation conditions are stable.

5. Enable the heating function if the process requires temperature control. Set the temperature within the range specified for the oil and equipment.

6. Select automatic mode and start the purification cycle.

During operation, observe the temperature, vacuum condition, oil flow, filter pressure and liquid level. A stable reading is more important than simply reaching a displayed value. Sudden pressure increases, abnormal noise, foaming, unstable vacuum or repeated liquid-level alarms require investigation before continued operation.

How to Handle Alarms

An alarm indicates that a monitored condition has exceeded the PLC setting or that a component may not be operating correctly. Read the alarm message first and identify whether it relates to high temperature, low oil level, filter blockage, pump overload, vacuum failure or electrical protection. Pressing alarm reset without correcting the cause may allow the same fault to return or damage the equipment.

If the filter pressure rises gradually, inspect the filter element and oil contamination level. If the vacuum cannot be established, check for air leakage, loose connections, blocked lines, insufficient oil level or a vacuum pump problem. For an electrical overload or abnormal motor sound, stop the relevant equipment and ask qualified maintenance personnel to inspect it.

Normal Shutdown Procedure

For a routine shutdown, stop the heating function first and allow the oil to circulate until the temperature falls to a safe level. Then stop the vacuum system, stop the feed pump and close the valves as required by the operating manual. If the machine will remain unused for an extended period, drain residual oil when appropriate, clean the filter housing and record any alarms or abnormal readings.

Use the emergency stop only for immediate hazards such as serious leakage, smoke, abnormal mechanical movement or uncontrolled temperature rise. After an emergency stop, do not restart the purifier until the cause has been identified and the system has been checked.

Practical Operating Precautions

A PLC panel can automate control logic, but it cannot correct unsuitable oil, blocked piping, incorrect valve positions or poor maintenance. Operators should record key readings before and after each treatment cycle and compare them with oil test results when quality requirements are important. Filtration, dehydration, degassing and oil regeneration are different processes; a normal PLC cycle does not by itself restore aged oil or guarantee that the treated oil meets a specific standard.