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
Unloaded