In the daily printing equipment repair work, the electrical part accounts for a large proportion. With the continuous development of printing technology equipment, the degree of automation control is getting higher and higher, and the control system is more complicated. Therefore, electrical maintenance personnel are required to have a high level of technical skills and quality, and understand the computer principle and operation.
a) Carefully read the electrical schematic diagram and related documents of the equipment, and grasp the electrical principle and control system principle of the equipment from the principle. Find out where the electrical components are located, wiring, routing, numbering, and direction.
b) For the failure of the machine equipment, carefully analyze the part where the fault may occur, and find the components and lines that may cause the fault according to the electrical schematic diagram, wiring diagram, etc., for diagnosis, and eliminate them one by one.
c) In electrical repair, first check the power supply voltage, whether the current is normal, whether the air pump pressure meets the standard, whether the lubricating system oil pressure reaches the standard, etc., if necessary, the load can be disengaged, which is helpful to judge whether the mechanical super negative
It causes electrical failure or protection.
d) The web offset press adopts the pc machine for automatic control, which brings many conveniences for troubleshooting electrical faults. Generally, there are LEDs in the control cabinet for fault indication, and the faulty parts can be found according to the prompts. In the device, you can first find the prompt on the console display, or use the laptop to talk to the industrial computer in the control cabinet to find the faulty system?
e) Commonly encountered electrical faults can be summarized as: fuse damage, contactor, relay contact damage, loose wiring, poor contact, button, limit switch failure, a position control switch in the safety protection system is not reset, In the tension control system, the photodetection part of the paper break system is faulty, and the solenoid valve is leaking and damaged.
f) The motor is the source of power in the printing equipment. The following is a brief introduction to the common faults of the DC motor and the AC motor.
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