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Constant temperature and humidity test chamber troubleshooting method

Time2019-02-27

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  The constant temperature and humidity test chamber is widely used, easy to use, accurate and reliable in humidity and temperature control. The constant temperature and humidity test chamber is an essential test equipment for aviation, automotive, home appliances, scientific research, etc., used to test and determine electrical, electronic and other products. And the parameters and performance of the material after high temperature, low temperature, damp heat or constant test temperature environment changes. If there is a fault, how to tell how to solve it. Let's take a look at it.

  Constant temperature and humidity test failure 1:

  The temperature of the constant temperature and humidity test chamber is high (more than 100 °C). The coolant level of the unit is too low (it should be seen from the oil sight glass, but not more than half); the oil cooler is dirty; the oil filter core is blocked; The temperature control valve is faulty (component is bad); the oil shutoff solenoid valve is not energized or the coil is damaged; the oil cut solenoid valve diaphragm is broken or aged; the fan motor is faulty; the cooling fan is damaged; the exhaust duct is not smooth or the exhaust air resistance (back pressure) Large; ambient temperature exceeds the specified range (38 ° C or 46 ° C); temperature sensor failure (control unit); pressure gauge failure (relay control unit).

  Constant temperature and humidity test failure two:

  The constant temperature and humidity test chamber unit has large fuel consumption or compressed air with large oil content. The correct position should be observed when the unit is loaded. At this time, the oil level should be no more than half; the return line is blocked; the return line is installed (with oil The distance from the bottom of the split core does not meet the requirements; the exhaust pressure is too low when the unit is running; the oil separation core is broken; the internal separator of the separation cylinder is damaged; the unit has oil leakage; the coolant is degraded or overdue.

  Constant temperature and humidity test failure three:

  Constant temperature and humidity test chamber unit low pressure actual gas consumption is greater than the unit output gas volume; deflation valve failure (can not be closed when loading); intake valve failure; hydraulic cylinder failure; load solenoid valve (1SV) failure minimum pressure valve stuck; user There is leakage in the pipe network; pressure setting is too low; pressure sensor failure (control unit); pressure gauge failure (relay control unit); pressure switch failure (relay control unit); pressure sensor or pressure gauge input hose leakage;

  Constant temperature and humidity test failure four:

  Constant temperature and humidity test chamber unit exhaust pressure too high intake valve failure; hydraulic cylinder failure; load solenoid valve (1SV) failure; pressure setting too high; pressure sensor failure (control unit); pressure gauge failure (relay control unit); Pressure switch failure (relay control unit).

  Constant temperature and humidity test failure five:

  Constant temperature and humidity test chamber unit current large voltage is too low; wiring is loose; unit pressure exceeds rated pressure; oil separation core is blocked; contactor failure; main unit failure; main motor failure;

  Constant temperature and humidity test failure six:

  Constant temperature and humidity test chamber unit can not start fuse wire failure; temperature switch is bad; wiring is loose; main motor thermal relay action; fan motor thermal relay action; transformer is bad; no power input (control unit); fault is not eliminated (control unit) The controller is faulty.

  Constant temperature and humidity test failure seven:

  The constant current and humidity test chamber unit has a large current or tripping user air switch problem; the input voltage is too low; the star-delta transition interval is too short (should be 10~12 seconds); the hydraulic cylinder is faulty (no reset); the intake valve Fault (opening is too large or stuck); loose wiring; host failure; main motor failure; 1TR time relay is bad (relay control unit).

  Constant temperature and humidity test failure eight:

  Constant temperature and humidity test chamber fan motor overload fan deformation; fan motor failure; fan motor thermal relay failure (aging); wiring loose actuator blockage;

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