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 electric appliance
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 circuit
The 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 self-starting of the motor when power is restored after the grid is de-energized, it 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, which is undervoltage protection.
10, star connection
Three windings, one end connected to one phase of the three-phase voltage and the other end connected together.
11, delta connection
The three windings are connected end to end, and three voltages are respectively connected at the three connection ends.
12, decompression start
When the motor capacity is large, the power supply voltage is lowered into the stator winding of the motor to start the motor.
13, the main circuit
The main circuit is a circuit from the power source to the end of the motor or line, and is a circuit through which a strong current flows.
14, auxiliary circuit
The auxiliary circuit is a small current through the circuit.
15, speed relay
A non-electrical signal detecting device with a rotational speed as an input, which can output a switching signal when the measured rotational speed rises or falls to a predetermined set value.
