30+ Years of Precision Instruments
temperature controller analysis of common problems;
1, no display after power-on?
answer; Check whether there is AC 220V voltage. Some temperature control instruments have fuses, and it is also necessary to check whether the fuses are normal.
2. the PV temperature display column on the temperature controller meter displays the words such as the maximum value of the temperature control range or HHHH?
a; After this happens, it can be basically determined that the thermocouple is disconnected.
3. The PV temperature display column of the temperature control instrument shows a negative number?
Answer; There are two possibilities, one is that the positive and negative terminals of the thermocouple are reversed. Another possibility is cooling, which is a normal phenomenon.
4. is there any deviation between the PV value of the temperature control instrument and the actual temperature?
a; it can be corrected by the temperature correction function in the temperature control instrument.
5. The temperature control instrument is not allowed to control the temperature, the higher the temperature?
Answer; Generally, it can be adjusted by self-tuning function, and it can also be adjusted by PID. At the same time, it can also be adjusted by adjusting the maximum output percentage of the temperature controller.
6. check that the resistance of the heating tube is normal and the temperature control PV value is normal, that is, the heating temperature rises slowly?
answer; check the maximum output percentage setting of the temperature controller.
7. temperature meter abnormal alarm output?
a; check the temperature controller alarm output terminal customization. And whether the alarm settings are correct.
8. when the temperature controller reaches the SV value, the heating will not stop?
a; check the control elements, contactors, SCR, etc., and whether the temperature control instrument is automatically or manually controlled.
