Lab 10 time delay relay

When electrical current is applied,the ___will energize and and cause the contacts to change states.

Coil

A timer relay consist of three basic components

Coil,contacts, and timing mechanism

A time -delay relay usually has one or more sets of N.O and N.C. ____

Contacts

Timer relays perform the same function as _,except that they move their contacts to their energized state after a preset time delay.

Control relay

An off-delay timer contacts are in their _states while timer is timing

Energized

Timer relays can be tested using out-of-circuit test or _

Mechanical test

An off-delay timers contacts are in their _state as soon as the preset time is reached

Normal

A_timer relay causes its contacts to change to their energized states as soon as the coil is energized

Off-delay

When an ____timer coil is energized,the timers contacts immediately move to their energized states.However, the timing mechanism does not operate until the coil is de-energized

Off-delay

When an __timer coil is energized,the relays timing mechanism begins to run buys its contacts remain in their normal states

On-delay

There are two types of time -delay relays:

On-delay/off-delay

A contact is shorted if it shows zero resistance in both the energized and normal states.

Out-of-circuit test

Timers are sometimes used to sequence the operation of machines .This is called

Time -driven sequencing

The ___relay is a type of control relay that changes the state of its contacts after a predetermined time has elapsed

Time-delay

For each distinct steps in the sequence that takes place, a _ must be used

Timer

The___mechanism is used to determine the desired time delay.——-pheumatic, solid-state, and motor driven timers

Timing

To avoid overheat,it is recommend that a motor be__when it is started

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