Also referred to as general purpose relays, they’re widely available in both 8 and 11 pin models, with 8 being the most common. Also, when we use the term “normally closed” it means that in the normal state of the relay de-energized the common contacts are providing conductive paths to their normally closed contact partners and only to these contacts. The purpose of the spring is to return the armature to its original position away from the coil when the coil is de-energized. See the illustration below: The electrical conductive paths that did exist with the “normally closed” contacts have now been “opened”. Also attached to the armature are the arms of the movable set of contacts the common contacts.
|Date Added:||7 October 2009|
|File Size:||12.40 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
An octal base relay like the one shown below is one of the most common electrical devices in use today.
In an 11 octal relay relay, there otal 3 of each of the aforementioned. The coil, a normally open contact and a ovtal closed contact. It is shown in the open position. In the de-energized octal relay of the relay, these octal relay contacts are in contact with touching the normally closed contacts.
See the illustration below:. You must also understand that although there are in this case 2 of each type of contact common, normally open and normally closedeach is designed to complete a path independent and separate from the other contact of similar type.
Octal relay the common contact 1 is completing a conductive path to the normally open contact 1 and at the same ocal, the common contact 2 is making contact with the normally open contact 2. All of the contacts that octal relay closed, now open and all of the contacts that were open, now close.
First, we need to know the symbols for the parts of a relay. Look at the illustration below as we examine a pushbutton, relay octal relay, 2 contacts and 2 lights in a simple control circuit.
Learn more about relay logic here.
When the relay is energized, the situation is reversed. So, with the relay CR1 energized, octal relay contact CR1. Also referred to as general purpose relays, they’re widely available in both 8 and 11 pin models, with 8 being the most common. It can be either side and it depends on how you reference the pin connections in the octal relay. These contacts are made of an electrically conductive material such as copper.
This basic relay is constructed of 5 main parts: The purpose of the spring is to return the armature to its original position away from relzy coil when the coil is de-energized. Also, when we use the term “normally closed” it means that in the normal state octal relay the relay de-energized the common contacts are providing conductive paths to their octal relay closed contact partners and only to octal relay contacts.
At the same time, there is no completed paths to the “normally octal relay contacts. At this point, our contacts switch. To further illustrate how a relay works, let’s look at it as it functions within an electrical circuit. Note that the pin numbers for the relay parts have been referenced refer to the pin out table above for clarity.
The Pin Out connections on the octall of the relay are as follows: When the coil is energized, it becomes magnetized. The illustration below shows the 3 symbols used in an electrical schematic to represent the 3 parts: The symbol labeled PB1 represents our push button.
The relay works on the principle of octal relay force. That is, a remote controlled switch, designed to direct the current path from one part of the circuit to another. The electrical conductive paths that did exist with octal relay “normally closed” contacts have now been “opened”.
The common contacts carry the supply voltage that is to be connected to another electrical device s. As octal relay footnote, all electrical schematics are drawn in the de-energized state. When the push button PB1 is not pressed, octal relay shown in purple is able to flow from L1 through the normally closed contact CR1.
You’ll note that there is no symbol representing the common contact of a relay. So then, when the relay is de-energized, the common contact 1 is making contact with octal relay normally closed octal relay 1 and the common contact 2 is completing a circuit path relah the normally closed contact 2.
The armature made of a ferromagnetic material and in close proximity to the coil – is attracted to the coil octal relay this magnetic force and moves octal relay it until it comes to rest against the coil’s iron core.