How to solve the problem that the high and low temperature test chamber does not heat up and does not keep constant temperature?
The maximum temperature of the high and low temperature test box is 180 degrees, which is mainly generated by the electric heating of the nickel-chromium alloy. If the test box does not heat up, the main power of the machine should be turned off to check whether the heating circuit breaker has tripped. If there is not, then continue to check. First, use the resistance of the multimeter to measure whether there is a resistance of about 20 ohms between the output of the solid state relay (pin 2) and the N line (depending on the model) If not, it means that the heating wire is open, and focus on checking whether the heating wire is damaged; if the heating wire is not damaged, open the side cover of the distribution box to run the machine and it is in a warming state, and observe whether the conduction indicator on the solid state relay is on. On, if it is on, (use the voltage range of the multimeter to measure whether the output terminal (pin 1) of the solid state relay has a 220V voltage to the N line. If not, then check the contactor, if there is, then measure the solid state relay Whether the output terminal (2 feet) of the N line has a 220V voltage, if not, it means that the internal circuit of the solid state relay is damaged and must be replaced.
Secondly, if the continuity indicator on the solid state relay does not light, then use the DC voltage range of the multimeter to measure whether the input terminal (3+, 4-) has a signal voltage of more than 12V. If not, there may be no output from the controller , Or damaged.
Finally, check whether the heater is damaged, remove the sealing plate inside the box of the high and low temperature test box, and use a universal meter to measure the two ends of the heating wire to see if it is continually connected.
Attachment: High and low temperature test box is not constant temperature, large fluctuation solution
1. Adjust the parameters. When the real-time temperature is close to the set temperature when the device is running at a fixed value, click the "AT" button on the operation screen to automatically adjust the PID. Please wait patiently. When the "AT" in the upper right corner of the screen does not blink, it means that it has been self-tuning. Finished;
2. The sensor or controller's ACU module is damaged or bad, causing temperature instability and fluctuation;
3. Check whether the circulation motor is running normally and whether the wind wheel is stuck, which causes the wind belt to move fast and slow;
4. There are too many test articles stacked in the test box (normally not exceeding one-third of the total volume of the inner box), resulting in the wind being unable to circulate and the temperature fluctuations being large.
What should I do if the high and low temperature test chamber is not heated or constant temperature?
leather corner sofa,Corner Sofas,large corner sofa,corner chaise sofa
Guangzhou LoPhiDa Co.Ltd , https://www.gzwidinlsa.com