Generally, some faults and alarm indications will occur during the test in the high and low temperature alternating humidity and heat test chamber. Now we summarize the fault phenomena, causes and treatment methods as follows:
1. Over temperature: solid state relay path, the instrument is out of control. Replace the solid state relay and adjust the parameters;
2. Overpressure: high ambient temperature and too much refrigerant. Reduce the ambient temperature, replace the axial fan or press the reset button of the pressure switch to release the refrigerant;
3. Overload: The overload protector is broken and the current is too large. Adjust the overload range, press the thermal overload reset button, replace the overload protector, and check the refrigeration circuit;
4. Underphase / reverse phase: The phase of the incoming line is broken or the sequence of the three phases is wrong. Check the incoming power supply, replace the phase sequence relay, and adjust any two-phase sequence of the three phases on the live line;
5. No heating: the solid state relay is open, and the heating tube is broken. Replace the original state or the heating tube or the parameter setting is wrong, the air switch is broken, replace the air switch;
6. No constant temperature: the PID of the instrument is disordered and the sensor is broken. Adjust PID parameters and replace sensors;
7. No cooling: solid state relay path, less refrigerant. Replace the old state or add refrigerant;
8. Pressing the power switch does not work: the main power circuit breaker is not closed. The circuit breaker is damaged;
9. The lighting lamp is off: the switch is broken, the bulb is broken. Replace the switch or bulb;
10. The compressor does not work: the refrigeration switch is not pressed, overheating protection, press the refrigeration switch or wait until the compressor is completely cooled before turning on;
11. Slow temperature rise: The fan is not turned, the door is not closed, and the load is too much. Press the heating switch of the high and low temperature alternating heat and humidity test box or check the fan to close the door and reduce the load;
Common faults and solutions of high and low temperature alternating damp heat test chamber
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