How do you repair contactors?
Asked in The Difference Between
What is the Difference between auxiliary contactor and power contactors?
How many contactors are used in a Star Delta configuration?
What size of contactors used for 20hp star-delta starter?
Asked in Windows XP, Windows 7
What are the main Components of control panel?
Asked in Electrical Wiring
How do you change star to delta?
In motor starters, this is usually done using contactors. Explanation of this can easily be done using a circuit diagram. There are three contactors, the main, star and delta contactors-all these contactors can be the same type. There are many ways of wiring a star delta but here I will only give a generalized answer. First, the main contactor and star contactors are energised thus the motor runs in star. After about 5 seconds, the timer which gets energized at the same time as the main and star contactors, switches its CONTACTS i.e the normally open closes and the normally close opens. This dienergize the star contactor and energized the delta contactor. Thus, the motor now runs in delta.
Asked in Electrical Engineering
What is the advantage of a sequencer over a contactor?
Using contactors (or relays) to control electric heat means that all of the heat will be started at one time unless separate time delay relays are used. Contactors are magnetic and make noise. They snap in and may hum. Contactors are normally used on commercial systems where they may not be directly attached to the ductwork. This prevents the noise from traveling through the system - Sequencer are cheaper and quiet compared to contactors.
Asked in Electrical Engineering
How many contactors are used in a star-delta starter?
What is difference between relays and contactors?
Relays and Contactors are electromagnetic switches. The only difference is that relays are usually used for low voltage applications while contactors are used for higher voltage application. Contactors usually have Overload protection. Some examples that I can give (at least in Manufacturing of Industrial Control panels): -Relays are use as electromagnetic switches to control certain parts of a circuit (low voltage application). A better example would be such as if you want your circuit to sound a horn when a certain abnormality is happening at a certain period of time, then depending how you set up your circuit, a specific relay will either open or close and you horn will start making the sound. -Contactors can be used for example, to start motors or a number of motors that require a higher voltage in order for the motor or motors start working. In the example that I just gave, contactors work as starters.
Asked in Electrical Engineering, Electrical Wiring
What is the disadvantage of using a star delta motor starter?
One disadvantage is that more motor contactors are needed which escalates the overall cost of the installation. Instead of just one motor magnetic contactor to start a motor, in a star delta configuration three motor contactors are needed along with a timer to control the opening and closing of the additional contactors.
What are the components of star delta starter?
Asked in Modification of Old Electrical Work, Electrical Engineering, Industrial Electricity and Electronics
How you select contactors on motor rating?
Why are circuit breakers and contactors coated with silver?
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What is hinky pinky for a triple set of electrical contactors?
Asked in Home Electricity, Electrical Wiring
All motor currents flowing through either the forward or reverse contactors must flow through?
Why is it the control of a three phase motor trips when changing from wye configuration to delta?
Few things to look for, one, are the contacts good on the run contactors. Two, has the motor wiring been changed in any way, contactors or leads on motor. Trace wiring and make sure the leads are paired correctly to the starters. Three, make sure the start timer is not bringing the run contactors in too late. Also check that the shorting contactor is opening when the run contactor comes in.