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Common Problems And Solutions

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High exhaust temperature

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False high temperature: the temperature sensor is broken, or the wiring of the temperature sensor is wrong. At present, the temperature sensor used by our company is PT100. Pay attention to the difference between positive and negative when wiring. The two red wires are negative in parallel and connected to the signed end of the circuit diagram. The other white wire is connected directly.

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What are the reasons for excessive oil in exhaust and how to deal with it?

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1) The oil level of the screw is too high. If the oil level is too high, the fluctuation of the liquid level in the oil and gas drum will enter the oil with a large amount of gas during the operation of the unit, resulting in the increase of the order of magnitude of the oil treatment capacity, resulting in oil in the exhaust. Generally, after the shutdown is stable, the liquid level can be 2 / 3 of the liquid level mirror.

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What are the reasons for oil return from air filter and how to deal with it?

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1) It is mainly abnormal shutdown. The shutdown with pressure in the unit makes it too late to close the inlet valve, and high-pressure oil and gas is ejected from the inlet valve (such as power failure shutdown, emergency shutdown)

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What are the reasons for insufficient exhaust?

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1) The relief valve shall be unloaded when it should not be unloaded. Check whether each relief valve is stuck and deflates all the time. 2) The air filter is blocked, resulting in less air intake. Remove the air filter element and conduct a short test run to see whether the pressure has increased (for units without safety filter element, pay attention to ensure that sundries do not enter the machine head)

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What are the simple methods for measuring gas volume? How to operate and calculate.

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1) Ensure that there is no long pipeline or other equipment pipeline affecting the volume from the air compressor to the air storage tank. If so, the volume shall be included. 2) There is no air leakage between the air compressor and the air storage tank. The air storage tank has a closed valve to hold the pressure and ensure that the valve does not leak. The pressure gauge on the air reservoir is good.

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What are the manifestations and causes of loss of excitation of permanent magnet motor?

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1) Loss of excitation judgment: after the loss of excitation of permanent magnet motor, the most direct and accurate judgment is that the measured motor back emf will decrease a lot (for example, the normal back emf will be normal 350V, and it will drop below 300V after loss of excitation. The size of the back EMF is determined according to the size of loss of excitation). It can also be judged according to the input voltage in the display screen. The input voltage value will decrease after loss of excitation (generally about 20V lower than the standard). Due to the large current after loss of excitation, if the frequency converter is equipped with self-protection, it will reduce the frequency.

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