Knowledge points of motor and electrical control technology
1, low-voltage electrical appliances
It refers to an electrical appliance that functions as an on/off, protection, control or regulation in a circuit with an AC rated voltage of 1200V and a DC rated voltage of 1500V or less.
2, the main electrical appliances
An appliance used in an automatic control system to send control commands.
3, fuse
It is a simple short circuit or severe overload protection appliance whose main body is a melt made of low melting point wire or foil.
4, time relay
A control device in which a contact is delayed or turned off.
5, electrical schematic
The electrical schematic diagram is a circuit diagram used to indicate the connection relationship and working principle of the conductive components in the electrical components of the circuit.
6, interlocking
An "interlock" circuit is essentially a combination of two inhibit circuits. The K1 action disables the power of K2, and the K2 action disables the power of K1.
7, self-locking
The circuit self-locking circuit is an action of interlocking the output signal itself to maintain the output.
8, zero pressure protection
In order to prevent the motor from starting when the grid is restored after power failure, the protection of the motor itself is called zero voltage protection.
9, undervoltage protection
When the power supply voltage drops below the allowable value, in order to prevent the control circuit and the motor from working abnormally, it is necessary to take measures to cut off the power supply. This is undervoltage protection.
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