The electrical system is the control center of the printing press. The maintenance and repair work of the electrical system is extremely important. This article will take the Heidelberg printing press as an example to introduce the main points of the maintenance of the electrical system.
Keep the printing workshop environment suitable and stable
The main factors affecting the normal operation of electrical systems are high temperature, high humidity, dust, electromagnetic interference and so on.
High temperature
Excessive temperatures accelerate the aging of electrical components and shorten the life of electrical components. The auxiliary equipment of the printing machine, such as the alcohol cabinet, the central air supply cabinet, the infrared drying cabinet, etc., are all large heat sources, which will make the temperature of the electrical system too high. Therefore, it is necessary to install an exhaust air dissipating device for these devices to maintain a suitable temperature in the printing workshop (22 to 28 ° C).
2. High humidity
When the humidity is too high, it is easy to form condensation on some electrical components once the temperature changes, which is mixed with dust, which may cause short circuit or open circuit of the electrical components and damage the electrical components. Excessive humidity can also easily rust individual components, resulting in functional failure. The relative humidity of the printing shop should be kept at 50% to 70%. Printing companies in the South should pay special attention to this.
3. Dust
Due to the reason of the paper falling off the powder and using the dusting, the printing workshop often has more dust, which may easily lead to poor contact of the electrical components, resulting in failure or damage of the electrical components. It is very important to install the cleaning device and clean the dust in time to ensure the normal operation of the electrical system. It is worth noting that the dust cleaning of the electrical system must be carried out after the power supply is cut off.
(1) Cleaning the main electric control cabinet
The surface dust in the main electric control cabinet can be sucked up first by the vacuum cleaner, and then the dust on the surface of the electric component can be blown off by a blowing device, and the circuit board can be taken out one by one if necessary. When cleaning, do not let the vacuum cleaner and the blowing device touch the components. Do not blow the circuit board with high-pressure airflow to avoid damage to the components.
(2) Cleaning console
The Heidelberg CP2000 console is equipped with a computer, and dust is easily attached to the computer cooling fan. The dust should be cleaned up in time according to the specific conditions of the workshop. When cleaning up, if the console is under warranty, the computer seal should not be removed at will. If it is removed, Heidelberg will cancel the relevant maintenance guarantee.
(3) Clean up each operating unit
There are many switches, solenoid valves, servo motors and other components on the flying parts, delivery parts and printing units. Clean the relevant parts in time to keep these parts away from ink, oil and dust, so as not to affect the normal operation of the operating unit. For example, infiltration of ink into the ink fountain tank may cause malfunction or even damage of the motor in the ink zone; too much powder in the delivery chain may cause blockage of the oil circuit, the device may alarm due to poor oiling, and the track and chain wear will be intensified.
(4) Main motor
The tail end of the DC brushless main motor is equipped with a grating encoder. When the dust enters, the coding will be chaotic and the main motor will run abnormally. The raster disk must be cleaned at this time, and care must be taken when cleaning to prevent damage to the grating disk. The main motor accumulates too much dust, which will cause poor heat dissipation, causing the temperature of the main motor to be too high and damage the insulation layer.
In addition, it should be noted that any electrical component damage needs to be replaced in time, and the temporary method will never be taken. For example, damage to the protective cover safety switch can result in serious safety accidents, resulting in personal or equipment accidents.
4. Electromagnetic interference
The printing machine should be away from strong electromagnetic radiation equipment such as high voltage transformers. Because strong electromagnetic fields can interfere with the electronic control system, especially the computer, the main motor drive board, etc., affecting its normal operation. Heidelberg printing machine power supply requires three-phase four-wire, 380V AC, and the fourth line is the grounding wire (not the neutral and ground wire can be combined). This line requires strict reference to the "Electrical Standard" to make the grounding cable. In addition, the Heidelberg printing press power system is strictly prohibited from external electrical equipment, otherwise it may affect the normal operation of the electrical system.
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