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Normally open and normally closed contacts are used in controls circuitry. They serve many functions.
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∙ 14y ago
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Are the contacts in a potential starting relay normally open?
The contacts are NC Normally Closed and open when the back emf is high enough to pull the contacts open and take the start capacitor out of the circuit.. usually at about 75% speed of motor.
Should your panic button be wired to the no or nc terminal. It doesn't say in the instructions.?
If the circuit of the panic button is monitored for a break in its circuit, the contacts will be in a N.C. configuration. There will need to be a relay in the circuit that is kept energized by the buttons closed contacts. When the relay drops out, its N.C. circuit contacts will activate the panic buttons load. If the panic button has no monitoring features then the contacts across the button will be wired in the N.O. configuration. When the button is pushed the circuit closes.
What happens if you energize power to wire on n.c. contacts?
If the relay contacts are in series with a connected load, then the load will energize.
What are form AAA contacts?
long wipe contacts. normally, aa and bb used for CB/isolator position monitoring.
What is the typical rating of a hot wire relay contacts?
The typical rating of a hot wire relay contacts is 35 amp
Why stop button always have NC contact?
When the contacts are Normally Closed (NC) the stop button is "in series" with the supply voltage. By activating the STOP function the contacts open interrupting the flow of current.
What happens when NC and NO contacts not work in electrical panel?
When a NC and NO contacts are not working the NC will not open and the NO will not close.
Can contacts correct your vision?
Contacts are meant to correct your vision. They are supposed to have the same function as glasses without the inconvenience.
How does a normally closed contact work?
De-energize it and note the position of the contacts.
How motor can control using timer contactor?
Control means, a timer cant control is speed directly, it can control its operation. A times will have NO nd NC contacts. Connect the motor in series with the timer contacts wrt desired operation
I have a Motion detector has a 6 wires. 2 for NC 2 for 12V and 2 for Tamp. It says to put the N.C to burgular protection zone on the control panel how can i connect the NC to a 12V relay instead?
I'm assuming you want the detection of motion to trigger some other event/system.In that case, you need to use the NC wires as a 'switch' to trigger the relay's coil.Apply the power supply's +12v to one NC wire, the other NC wire to relay coil positive, and the relay coil negativeto the power supply's 0v (negative or common) wire.You will also need to provide the 12 volt power to the detector itself (it also needs power to function). Of the two leads you have marked '12v', one should be positive and the other negative. Connect these to the appropriate positive or negative wires from the power supply.This will mean that during normal (no motion detected) operation, the normally closed (NC) contacts on the detector will keep the relay coil energized until motion is detected. Then the relay coil will de-energize.This is important because: The NO and NC contacts on the relay will be in the listed states while de-energized. In your case, they will be opposite of what is listed because in a normal condition your relay will be energized. This is because the sensor has NC contacts instead of NO contacts.In short: Whatever you want to happen during motion detection should be wired to the normally closed contacts on the relay (because relays are considered de-energized in the normal state, but yours will be energized in the normal state).*** (cough, cough) NERD!!!
What does a relay do?
A relay is an electrically actuated switch. There are a number of contacts actuated by a soleniod. When the solenoid is energized the position of the contacts changes, "throwing" the switch. The terminology of switches and relay contacts is as such: (number)p-(st(no/nc)/dt) The number followed by p is the number of poles. This is the number of independent "switches" in the unit. The (number)p may be replaced with sp (single pole) meaning 1p or dp (double pole) meaning 2p. ST stands for single throw, there is only two contacts for each pole. ST is usually suffixed with NO or NC in relays standing for normally open and normally closed. Normally open contacts conduct when the solenoid is energized. Normally closed contacts conduct when the soleniod if off. DT stands for double throw, meaning that there are 3 contacts per pole: a common contact, a NO contact, and a NC contact. So: a 3p-st NO relay has 3 switches that close when energized. a sp-dt relay has one 3 contact switch. An electrically actuated 3-way switch, if you will. a dp-st NC relay has one switch that opens when the solenid is energized.
Are the contacts in a potential starting relay normally open?
The contacts are NC Normally Closed and open when the back emf is high enough to pull the contacts open and take the start capacitor out of the circuit.. usually at about 75% speed of motor.
Where is the nearest section 8 office in Charlotte NC?
You should be able to find it < a href = http://www.hud.gov/offices/pih/pha/contacts/index.cfm>here </a>
Will a relay with NC contacts provide logic function that is similar to a NOT logic gate?
yes we can implement the 'NOT' gate operation by using a relay. At first we have to know the logic of NOT gate. when i/p is high it will give o/p high and vice versa so for implementing this opertion via relay we have to use the relay contact "NC".i.e normally closed then only it is possible. By considering that we are using the NC contact of the relay then when we energise the coil of the relay the NC contact will change over to NO so it is similar to logic opertion i/p high --- o/p low Ex: the microwave oven won't get energised till the door is closed .
Should your panic button be wired to the no or nc terminal. It doesn't say in the instructions.?
If the circuit of the panic button is monitored for a break in its circuit, the contacts will be in a N.C. configuration. There will need to be a relay in the circuit that is kept energized by the buttons closed contacts. When the relay drops out, its N.C. circuit contacts will activate the panic buttons load. If the panic button has no monitoring features then the contacts across the button will be wired in the N.O. configuration. When the button is pushed the circuit closes.
How do you undo merged contacts in Gmail?
Contacts -> More -> Restore contacts....
