Control of Machines by Brijinder Singh

By Brijinder Singh

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This removes the disadvantage of possible opening of the series connected closing coil on low loads. However, any variations in line voltage would affect the setting at which the contactor would close. At one time lock out accelerating contactors were very popular due to their simplicity. Now due to development of better and simpler accelerating means they are rarely used. 4 Inductive Accelerating Contactors It is similar in appearance to the double coil lock out type contactor. However its lock out coil (also known as hold out coil) magnetic circuit is highly inductive.

One part is the mechanical actuator or button assembly and the second part is the electrical portion or contact assembly called the contact block. The mechanical actuator or button assembly can be of momentary-contact spring returned type or of maintained contact type. The momentary-contacts spring returned push button remains actuated as long as the button is physically held pressed by the human operator. Under pressed condition the contacts change their positions in the contact block. Once the button is released the contacts return to their normal position.

When current through the coil falls below a predertmined value the spring pulls the armature back and contacts close. The value at which the coil fails to hold back the attracted armature is determined by the setting of the spring. Some terms used in connection with a current relay are: Pull in current. It is the minimum value of current to close or pull in the relay armature. Drop out current. It is the value of current below which the relay no longer remains closed after having being pulled in.

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