High and low temperature test box problems how to repair?

How to repair the problem of high and low temperature damp heat test box?
1. After the external factors are excluded first, the system is first decomposed according to the fault phenomenon.
2. Analysis and judgment of the system's synthesis. Or you can use the method of backwards to find the cause of the failure:
3, according to the electrical wiring diagram to find out if there is a problem with the electrical system,
4. Finally, find out if there is a problem with the cooling system. Before you can understand the cause of the problem, you must not disassemble or replace components to avoid unnecessary trouble.
5, high and low temperature hot and humid test chamber temperature protector
a. Overtemperature occurs: automatic recovery (usually subject to scale).
b. Electrical fault: Can't be switched on/off.
6. Temperature SSR1
a unstable: can display voltage less than 220±10 D, need to be changed.
b. Open: no voltage AC display, or open, needs to be changed.
c. Short circuit: conduction cannot be controlled or open and needs to be changed.
7, the temperature controller of the high and low temperature damp heat test box
a. Offset error: First set the PID self, after the stabilization, it is not allowed to adjust the deviation value, that is to make it conform to the actual correct temperature.
b. Electrical fault: The display of the temperature controller does not show or show intermittent PID control that cannot be done continuously.
c. Some code setting errors: Please restore the code value according to the internal clock.
8, high and low temperature hot and humid test chamber temperature sensor
a. Offset error: The self-calibration offset can be adjusted.
b. Provide power supply 5 v: No VDC power supply 5 v Power supply needs to be changed.
c. Humidity module: 0 and 1 v shows or does not change based on actual humidity or stays at a fixed value and needs to be changed.
d. Level switch: Always on or off or not, needs to be changed.
e. Water level control will cause humidifiers to be usually bad enough, too much will cause humidification to reach or abnormal water and water lost in the box to add water (adjust the water level pipe to block the passage of QingTong, please.
f. humidification pump: DC voltage 12 va). Power supply needs to be changed.
B). Pump failure on/off cannot be flushed and often needs to be changed.
g. Addition of wet heat pipe is damaged: cannot or cannot be heated and needs to be changed.

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