Introduction to the functions of the York slider displacement sensor in Model Gonglenghui 534C1552H01 and solutions to common faults

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A slider displacement sensor is a metal-based linear device designed for controlling, regulating, and accurately measuring displacement and length in systems. The York 534C1552H01 slider displacement sensor belongs to the inductive type; it converts mechanical displacement into a resistance or voltage output that is in a linear or some other functional relationship with that displacement, through inductive elements. The displacement of the slider causes changes in resistance, and the amount of change in resistance reflects the magnitude of the displacement, while an increase or decrease in resistance indicates the direction of the displacement. The York slider displacement sensor converts resistance changes into a voltage output, which is then displayed in the unit control center. Its advantage is that it facilitates the direct transmission of signals into the unit, making it suitable for York refrigeration units. Below, Gonglenghui explains the common faults of the sliding block displacement sensor and their solutions. I. Possible reasons for the low reading or no display on the slider displacement sensor include: 1. Power supply failure; 2. Incorrect installation; 3. The slider being stuck; 4. Damage to the internal potentiometer component. Solutions: If it’s a power supply issue, identify and resolve the problem; for incorrect installation, a stuck slider, or damaged internal potentiometer, professional engineers should carry out the installation and maintenance work. II. The fluctuating readings of the slider displacement sensor may be caused by damaged internal components, resulting in inaccurate measurements; it is recommended to purchase and install new ones. In applications in York refrigeration units, slider displacement sensors are not considered consumable items compared to pressure sensors; pressure sensors often suffer from issues such as unstable output signals and large numerical deviations. Next, Gonglenghui will explain how to replace pressure sensors. III. Replacement of the pressure sensor 1. Cut off the control power supply. 2. Close the sensor isolation valve. 3. Open the microprocessor control board. 4. Use the table below to determine the sensor terminals for the simulation board or SBC board. 5. Loosen the terminal bolts on the sensor and disconnect the sensor wires. 6. Use tape to attach the 3-foot-long pull wire to the sensor wire that is to be removed. 7. Pass the cable through the guide tube and pull the sensor wire out of the cable hole in the collection tube, then separate the converter connector from the pull cable. 8. Use a wrench to remove the metal hex screw at the sensor mounting plate. 9. Install the new sensor and stick the wire ends to the pull cord with tape. 10. Insert the new sensor connector into the control board and reconnect it to the terminal circuit board. 11. Turn off the microprocessor control board. 12. Reopen the sensor away from the valve. 13. Turn on the control power supply. IV. Testing of pressure sensors 1. Turn off the compressor to achieve pressure equilibrium. 2. Isolate the inlet sensor PE-4 from the unit and depressurize it. It should be noted that before opening to the atmosphere, all refrigerant vapor must be recovered or transferred in accordance with local regulations. 3. Use a digital voltmeter to measure the voltage of PE-4 at connector P4 on the single-board computer. 4. At standard atmospheric pressure (14.7 pounds/inch3 absolute pressure or 0 pounds/inch2 gauge pressure), the voltage reading should be: 1.48–1.72 V DC. At higher elevations, the allowable error for the converter readings is approximately 0.0V of DC per 1000 feet above sea level. Therefore, if PE-4 is measured at an altitude of 5,000 feet, the measured output voltage reading will differ by 0.1 V DC from that under normal weather conditions, and it should lie within the range of 1.38 V to 1.62 V DC. 5. Isolate the oil pressure sensor PE-1 from the system and open it to the atmosphere. 6. Measure the voltage of PE-1 on the single-board computer connector P4. 7. At standard atmospheric pressure, the voltage reading should be between 1.1 and 1.29 V DC. 8. Isolate sensor PE-2 from the device and reduce pressure. 9. Measure the voltage of PE-2 at the P4 connector on the single-board computer. 10. At standard atmospheric pressure, the voltage reading should be between 1.1 and 1.29 V DC. 11. Due to export pressure, PE-3 cannot be closed at its measurement point. 12. Measure the voltage of PE-3 in the P4 connector on the single-board computer. 13. Measure the voltage of PE-1 in the P4 connector on the single-board computer. 14. The difference between the two voltages mentioned above should be within 0.04V of DC voltage. 15. If correct, the test is complete. The figure below is the conversion data table for pressure sensors. If you have any questions, feel free to send a private message to Gong Leng Hui for technical materials.