Each device has a power (equipment nameplate), the power of all the equipment is added to the total equipment power (total capacity) Pe, because not all the equipment at the same time together, so multiplied by the need factor Kx (check the need factor table to get), multiplied by the active power Pjs.
Ijs: Calculation of the current;
Pjs: Calculation of power;
Three-phase: Pjs = root 3*UN. Calculate the power;
Three-phase: Pjs=Root 3*UN*Ijs*cosφ, UN=380V;
Two-phase: Pjs=UN*Ijs*cosφ, UN=220V;
cosφ is the power factor, according to the specific situation to choose, generally between 0.75~0.9
Electrical diagram
I. The electrical diagram is used to explain the principle of electrical work, describes the construction and function of electrical products, and provides a sketch of the installation and use of the product, mainly graphic symbols, wireframes, or simplify the appearance of the connection of the relevant components of the electrical equipment or system to indicate the connection of the electrical equipment or system.
Second, a complete electrical diagram should include:
1, the general catalog of drawings
2, technical description
3, electrical equipment layout
4, control system block diagram
5, electrical schematic: A, electrical control cabinet (box) dimensions of the map, B, the electrical components of the cloth board map C, the electrical schematic D, wiring terminal diagram E, equipment wiring diagram (or wiring cable table) F, electrical components list
6, electrical equipment manual
The six parts.
Three, electrical equipment layout plan
is the entire system of each device, each unit in the user site of the actual placement of the location, the map is to guide the site equipment installation of the specific location of the only basis for the production of the form of simple block diagrams can be used to indicate that each part of the positioning must be accurate. Preparation must be completed using 1 page of drawings.
Four, the control system block diagram
is the form of a block diagram to draw the system's control flow, this part should strive to be accurate, because he is the main line of others read the circuit diagrams and write the PLC program control ideas, but also for assembly to guard against major errors in reference. Preparation must be done using 1 page of drawings.