Common faults and treatment methods of rkc temperature controller

1, the power indicator is normal, but the temperature controller has no screen display. This fault is mostly caused by the temperature controller on the voltage regulator (7805 or 7812) in the long-term use of heat caused by solder joints break, sometimes there is a virtual welding phenomenon at the factory, the main re-welding can be.

2, the temperature controller shows normal, metal sleeve thermometer, Marine thermometer, V-type thermometer, copper sleeve thermometer but can not be added, generally for the heating element damage, in the case of confirming that the heating element is no problem, mostly for the relay bad (mostly in the heating power of more than 1000W in the instrument). If the relay is good, the relay drive element (9013) is bad. For solid-state relays, it is easy to damage, and for bidirectional thyristors, there is less burning.

3, the temperature controller appears to show the temperature is much higher than or much lower than the actual temperature, this phenomenon is generally the temperature sensor damage, replacement can be.

4, the temperature controller appears 999 or 000 beat and there is an alarm output, laser rangefinder, digital oscilloscope, ground resistance tester, anemometer this phenomenon is the sensor break, such as LLL or half 000, this phenomenon is the sensor short circuit, replacement.