In the study of fundamental diagrams define the poles of the electric circuit and set the direction of current is from plus to "minus". Identify the components of the schema: contacts, resistors, diodes, capacitors and other elements included in the circuit. If the schema contains a few circuits, you should read them one by one, examining each sequentially.
First, read the schema, determine everything included in a circuit of a power system. Locate the power source, relays, electromagnets, if they are provided. Identify all sources used current (direct or alternating), its phase or polarity.
In the study of schema you need to have an understanding of the operation of each circuit element separately, starting with the simplest components. A resistor is a passive element of the electrical circuit and is designed, generally, to power dissipation, voltage drop. In the diagrams he used to refer to the resistance function and is displayed in the rectangle. The capacitor, however, accumulates electric energy of alternating current, the sign – two parallel lines.
Read all the explanatory notes given in the diagram. If the device is motors or other power consumers swipe their analysis. Consider all of the chain data items from one pole of the power source to the other. Note these circuits arrangement of resistors, diodes, capacitors and other components of the scheme. Make a conclusion about the practical value of each element of the scheme and the failure of electrostrictive when you lock or absence of any of the parts of his chain.
Precise location of protective devices: relay, maximum current, fuses and automatic regulators, as well as items switching. On the concept of electrostrictive can be marked with labels indicating the security zones each of the elements, find them and compare with other data circuit.
Advice 2 : How to read wiring diagrams
For correct reading of electric circuits is necessary not only to know the symbols of the components, but also to imagine how they are formed into blocks. To understand the nature of the interaction between elements of the electronic device, learn to identify how the scheme passes the signal as it is converted.
Start your acquaintance with the scheme of allocation of power circuits. As a General rule, the supply voltage to the cascades of the device are located on the diagram above. Power is supplied to the load, and then comes to the anode of the vacuum tube or the collector circuit of the transistor. Find the junction of the electrode with the corresponding terminal of the load; in this place the amplified signal is removed from the cascade.
To determine the input of each circuit of the cascade. Highlight the main controlling element of the cascade and explore the adjacent support elements.
Locate the capacitors located before the input stage and its output. These elements play an important role in strengthening the AC voltage. Capacitors are not designed to pass DC, so the input impedance of the next block will not be able to bring a cascade of steady state DC current.
Proceed to familiarize with the cascades that amplify the signal DC. The components forming the voltage, connect here without capacitors. Most of these cascades are operating in analog mode.
Determine a series of cascades, to identify the direction of signal flow. Pay special attention to frequency converters and detectors. Find out which of the cascades are connected in series and which in parallel. At parallel connection of multiple cascades of signals are processed independently of one another.
In addition to the wiring diagram examine the accompanying diagram of connections (the so-called wiring harness). Layout features of electronic devices will help to understand what are the main blocks of the system. The drawings also make it easier to determine the Central element of the system and the interaction between it and the auxiliary subsystems.