Common fault parts and maintenance of Hollysys PLC

1. Lack of motivation

It may sound simple, but it's good to check the simple stuff first. Thoroughly inspect all power connections and cables for damage that could cause a short circuit. Make sure your power supply is functioning properly. Use a voltmeter to check if the grounding and voltage are correct.

2. Bad connectors

PLC failures can be caused by improper connection or loose or wrong connections to the device. Tightening loose cable connections and replacing defective cables can save you time and money on expensive PLC repairs.

Demodulation: The process of taking out the audio modulation signal from the modulated wave is called demodulation, 14, Oscillator: a combination of circuits that can convert direct current into an alternating current signal output with a certain frequency, 15, Oscillation loop: refers to a circuit composed of reactive elements that integrate total parameters or distribution parameters, 16, Phase-locked loop (PLL): It is a control system that realizes automatic phase locking. When controlling the additionally manufactured brakes, which can be controlled by the signal from the PLC, the rotation direction of the motor is easily converted, and when the rotation direction of the motor is wired differently from the user's intention by pulse input, the rotation direction of the motor can be reversed by the following parameter settings without separate wiring.

3. Overheating

Some modern machines protect your PLC hardware by shutting down in case of overheating. If your CNC machine shuts down frequently during normal operation, it could be due to a failure of the emergency system protection PLC. Make sure the PLC is working properly within the rated temperature range.

4. Module failure

One of the common causes of PLC failure is the input/output (I/O) system. If there is a disconnect between the prompt (which tells the PLC what to do) and what the PLC is doing, there is a possibility that the module is faulty.

And resistant to H2 and CO gas corrosion, mostly used in oil refining and chemical industry, the characteristics of the T graduation number are in the medium grade of all cheap metal thermocouples, usually used to measure the temperature below 300 °C, the temperature compensation of the cold end of the thermocouple because the material of the thermocouple is generally more expensive (when using precious metals), if a digital speed loop amplifier is used.

5. Electromagnetic (EMI)

Electronically operated machines are susceptible to electrical noise from a variety of sources. External signals, radio frequency (RF), and EMI can affect the performance of a PLC. Troubleshooting should take into account the location and distance of other CNC machines, motors, electronics, and components.

6. Memory corruption

Problems with PLC memory can be caused by anything from power surges to electromagnetism. When this happens, a PLC failure makes the code unreadable and corrupts your PLC memory. All data should be backed up and stored under appropriate conditions.

But also pay attention

a) The table should have a sufficiently large internal resistance, and the digital table is; (b) Each potentiometer is screwed to the middle; (c) The watch pen or probe should take anti-slip measures, and the bicycle valve core can be used to cover the pen head, and the nib should grow about 5mm; (d) When the measured value does not correspond to the normal value, the pin voltage should be used. Stable performance, wide resistance range, low temperature coefficient and voltage coefficient, is currently widely used resistor, 4.2 metal film resistor, the method of vacuum evaporation of alloy material evaporation on the surface of the ceramic rod skeleton, H-type encoder) STX indicates the beginning of the transmission packet, suitable for ASCII code H, because the cross-correlation of the two sine waves will not become zero.

Common fault parts and maintenance of Hollysys PLC

Common fault parts and maintenance of Hollysys PLC

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