Woodward simplex power board 5501-467 for after-sales service

Description

Any PLC has fault self-diagnosis function, and when the PLC is abnormal, its self-diagnosis function should be fully utilized to analyze the cause of the fault. When there is an abnormality in the PLC, first check the power supply voltage, whether the screws and connectors of the PLC and I/O terminals are loose, and whether there are any other abnormalities. Then, based on the status of various LED indicators set on the basic unit of the PLC, check whether there are any abnormalities in the PLC itself and externally. The following is an example of using the FX series PLC to illustrate the method of diagnosing the cause of PLC faults based on the status of LED indicators.

Power indicator ([POWER] LED indicator) When power is supplied to the PLC basic unit, the [POWER] LED indicator light set on the surface of the basic unit will light up. If the power is turned on but the [POWER] LED indicator light is not on, please confirm the power wiring. In addition, if the same power supply has drive sensors, please confirm whether there is a load short circuit or overcurrent. If it is not for the above reasons, it may be due to the inclusion of conductive foreign objects or other abnormal situations in the PLC, causing the fuse in the basic unit to blow. At this time, the problem can be solved by replacing the fuse.

Whether the LED light of the input unit is on or off, please check whether the input signal switch is indeed in the ON or OFF state. If the rated current capacity of the input switch is too large or due to oil intrusion or other reasons, it is easy to cause poor contact. When the input switch and LED light are connected in parallel with a resistor, even if the input switch is OFF but the parallel circuit is still connected, the PLC can still be input. If input devices such as light sensors are used, the sensitivity may change due to dirt adhering to the emitting/receiving parts, which may not fully enter the “ON” state. Unable to receive ON and OFF inputs in a shorter period of time than the PLC operation cycle. If different voltages are applied to the input terminals, it will damage the input circuit.

Output indication: Regardless of whether the LED light of the output unit is on or off, if the load cannot be turned on or off, it is mainly due to overload, load short circuit, or impact current of capacitive load, which causes the relay output contact to bond or poor contact due to poor contact surface.

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