What is a load current
What is a load current?
Why does the control circuit have to be grounded?
there is only one reason why you have to do this - SAFETY. Earth and body faults in Control circuits must not lead to an unintentional start-up of a machine or prevent it from coming to a standstill (VDE). Imagine a simple control.
What is self-holding?
With a Self-holding a permanent switching state is established in a controller by a short switching command (e.g. pressing a button). In contrast to jog mode, a short press of the button is enough to set a switching state.
How is the protection of the control circuit achieved?
The Control circuit (red) is protected by fuse F1, while the main circuit with the motor is protected by F2. It is also possible to switch other main circuits (blue). Since the Control circuit is separately fused, it cannot fail if, for example, a motor has a short circuit.
What can I switch with the contactor?
The Contactor is an electrically operated switch which can be used to disconnect different voltages and to switch large loads on / off.
How is a contactor controlled?
The main difference lies in the self-retention of the respective contactor. When switching directly, this will be Contactor K2 via button S1 controlled and attracts. Because of the self-holding, it stays that way Contactor Q2 tightened. ... By pressing button S2, he opens the current path of the Q2 contactor and this drops out.
How are control contacts called?
The auxiliary resp. Control contacts have a two-digit name. In the first place is the ordinal number with which the auxiliary contacts are consecutively numbered. In the second position is the function number that indicates the task of the respective auxiliary contact (e.g.
What is a contactor interlock?
The Contactor interlock is used to lock / block certain functions of a control against each other. This ensures, for example, that a reversing contactor circuit does not activate right and left rotation at the same time, which would lead to a short circuit or worse.
What is a key lock?
In the Button lock In contrast to the contactor interlock, the contacts to one another are not blocked, but the buttons or switches are mechanically locked. ... So that the buttons cannot open or close at the same time.
What is a sequential circuit?
The Sequential circuit is always required when a circuit is to switch something in a certain order. For example in a bakery, in a bread mixing plant. The baker may only add the baking mixture when the water is in the pot. ... This circuit is part of the Sequential circuit automated.
What is the main circuit?
The Main circuit, also known as a load circuit, is subjected to the load current of the consumer and represents part of an electrical circuit. It is formed from the main devices and the main lines.
How does a relay work, simply explained?
Roughly speaking, these are the classic ones relay to electromagnetic switches. ... In principle there is a relay from a coil with an iron core. If current flows through the coil, an electric magnetic field is built up and the ferromagnetic armature attached to the end of the coil is attracted.
How do you connect a relay?
the relay coil. As a rule, a secured line is placed on contact 30 and from 87 it then goes on to the consumer / the device / the headlight. The wire coming from the switch / button is connected to 85 and the ground to 86, either directly to the battery or to the vehicle body.
What kind of relays are there?
- Schematic structure. As an example, here is a hinged anchorrelay shown with a normally open contact (also called normally open contact). ...
- Terms. ...
- Advantages and disadvantages of electromechanical relay. ...
- Small relay. ...
- Contactor. ...
- Solid state relay. ...
- Bistable relay. ...
- Poled relay.
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