According to the daily maintenance experience, we summarize some decision analysis methods and procedures.
Investigation method: review the lighting, smoke, odor, power supply change, lightning strike, moisture, wrong operation and wrong maintenance before the failure.
2. Intuitive method: observe the external damage of the circuit, the leakage of the voltage guide pipe, the overheating of the circuit, the state of power supply switch, etc.
3. Air compressor accessories test method:
A continuity test:
1) air compressor parts separately from the rest parts of the suspected fault and to see whether the fault disappear, if lost, is to determine the malfunction, or step into the next search, such as: air compressor accessories can't normal Hart, telecommunication, power supply can be disconnected from the table body, the method of field plus a power transmitter power to communicate, to see if the cable stack 2 KHZ electromagnetic signals interfere with communication.
2) air compressor parts short circuit detection: in the case of security, the related part of the loop short directly, such as: small difference transmitter output value, can guide tube disconnected, from a valve directly to the outside differential pressure signals directly to liutech air compressor parts, on both sides to observe the transmitter output, to determine the pipeline wall, leakage of connectivity.
3) replacement test of air compressor accessories: replace the parts suspected to have faults and judge the fault parts.Such as: suspected transmitter circuit board failure, can temporarily replace a piece, to determine the cause.
4) branch detection: divide the measurement circuit into several parts, such as power supply, signal output, signal transmission and signal detection. Check by parts, from simple to complex, from the outside to the inside, narrow the scope and find out the fault location.