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Common Faults and Solutions for Asphalt Extensometers
2020-10-11
The common faults and troubleshooting methods for the asphalt ductility tester are as follows:
① Fault: The leakage protection device trips when the power is turned on.
Reason: The residual-current device (RCD) detection system monitors the ground current. Since this instrument requires grounding to operate, some instruments may cause the RCD to trip.
Solution: Bypass the power supply through the residual-current device (RCD) or replace the RCD with one that allows a higher leakage current.
② Fault: Slight electrical leakage from the instrument’s casing.
Reason: The instrument's grounding is unreliable.
Solution: Inductive loads may induce static electricity on the instrument’s enclosure. To ensure reliable grounding, connect the instrument’s rear grounding terminal to earth using a wire with a cross-sectional area of at least 2 square millimeters. A more reliable grounding method is to wrap the grounding wire around a radiator or bury it directly in the ground. Another simple and effective way to eliminate leakage current is to swap the positions of the neutral and live wires in the power cord.
③ Fault: Cannot automatically return to the home position.
Reason: The limit switch at the starting point is damaged.
Solution: Open the machine cover and replace the limit switch on the starting-side end.
④ Fault: The compressor starts but fails to cool or the cooling speed is very slow, or the compressor fails to start.
Reasons: The condensing fan is positioned too close to the wall, resulting in poor ventilation; the compressor is lacking refrigerant; and accumulated refrigeration oil makes it difficult for the compressor to start.
Solution: The instrument’s position needs to be adjusted to ensure proper ventilation, and a professional refrigeration engineer should be called in for repairs.
⑤ Fault: The transmission shaft is making an unusual noise.
Solution: The guide rails and transmission shaft are poorly lubricated; please add lubricant.
⑥ Fault: The drain valve is leaking.
Solution: Remove the valve, wrap it with waterproof tape, and then tighten it again.
⑦ Fault: The motor does not rotate, the tensile test cannot be performed, and the manual function has also failed.
Solution: The inverter is damaged. Replace it with an inverter of the same model.
⑧ Fault: The printer cannot print.
Possible causes include: The printer is not online; press the printer’s “SEL” key to bring the printer online; or the printer is out of paper.
Solution: Please refer to the WD-A Micro Printer User Manual or follow these steps to load paper into the printer: Press the “Out” button to open the cartridge compartment; then, lift up the printer’s front panel. Gently apply slight outward pressure to the brackets at both ends of the paper spool to easily remove the spool. Next, slide the new paper roll onto the paper spool. Press the “SEL” button to turn off the printer’s indicator light, then press the “LF” button to rotate the print head. At this point, manually feed the paper end into the print head’s inlet directly in front of you; the paper will gradually feed into the print head until about 1 centimeter of paper protrudes from the gap between the print head and the upper housing. Then, press the “SEL” button again to stop the print head’s movement and re-establish connection. Close the printer’s front cover, pass the printing paper through the output slot on the front cover, push the cartridge compartment back onto the printer’s panel, and make sure that both sides of the cartridge compartment are securely locked.
⑨ Fault: The printer is printing unclearly.
Solution: The ribbon has aged. Please refer to the instructions for replacing the ribbon. For details, consult the WD-A Micro Printer User Manual or follow these steps to replace the ribbon: Open the printer cover. First, place the right end of the ribbon cartridge onto the gear on the right side of the print head. Use your hand to hold down the knob on the ribbon cartridge, then gently turn it clockwise until the right end of the cartridge rests firmly against the stop. Next, lower the left end of the cartridge. Check whether the ribbon is fully straightened. If it’s not straightened or if part of the ribbon is still exposed outside the cartridge, continue turning the knob on the cartridge until the ribbon is completely retracted and straightened inside the cartridge.
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