Intelligent components cabinet temperature anomaly signal alarm action signal frequently, can not be restored.

Encountering this kind of failure, first check whether the SV value setting value is set, instrument OUT indicator is lit, with a "multimeter" to measure the instrument's 3 and 4 terminals whether there is a 12VDC output. If the light is on, terminal 3 and 4 also have 12VDC output. It shows that the problem is in the heating body control devices (such as; AC contactors, solid state relays, relays, etc.), to see whether the control device has an open circuit, whether the device specifications are wrong (such as 220 circuit connected to the 380V device), whether the line is connected to the wrong phenomenon. Also check whether the sensor has a short circuit (thermocouple short circuit, the meter always shows room temperature).