1, FU: fuse.
2, KM: contactor.
3, KA: intermediate relay.
4, KT: time relay.
5, KV: voltage relay.
6, SA: auxiliary contact of the switch.
7, FR: thermal relay.
8, SB: button.
Electrical system diagrams are mainly electrical schematic diagrams, electrical layout diagrams, electrical installation wiring diagrams, etc., drawing software has electrical CAD, protel99, Cadence, etc..
Therefore, the electrical schematic diagram is a kind of electrical system diagram. It is drawn according to the working principle of the control line diagram, with a simple structure and clear hierarchy. Mainly used to study and analyze the working principle of the circuit.
Electrical layout and installation diagram is mainly used to show the various electrical equipment in mechanical equipment and electrical control cabinet in the actual installation location. For mechanical and electrical in the control equipment manufacturing, installation, maintenance, repair and provide the necessary information.
Electrical installation wiring diagram is to carry out the device, equipment or complete sets of wiring to provide detailed information on the electrical connection between the various installation wiring diagram items, including the connection relationship, cable types and laying lines.
Electrical schematic diagrams are commonly labeled: QS knife switch, FU fuse, KM contactor, KA intermediate relay, KT time relay, KS speed relay, FR thermal relay, SB pushbutton, SQ travel switch.
Expanded Information
The design of electrical component layout should follow the following principles:
1, must follow the relevant national standards to design and draw electrical component layout.
2, the same type of electrical components layout, the larger and heavier should be installed in the control cabinet or panel below.
3, heat-generating components should be installed above or behind the control cabinet or panel, but the thermal relay is generally installed under the contactor to facilitate the connection with the motor and contactor.
4, electrical components, operating switches, monitoring instruments and meters that require frequent maintenance, calibration and overhaul should be installed at a suitable height for the staff to operate.
5, strong power, weak power should be separated from the line, pay attention to the shielding layer of the connection, to prevent interference from running into.
6, the arrangement of electrical components should consider the installation gap, and as far as possible to achieve neat, beautiful.
Baidu Encyclopedia: Electrical Schematic Diagram