Motor Control Flashcards
True or false?
Timers enable a multitude of operations in a control circuit to be started and stopped at different intervals
True
The ? timing relay typically uses a pneumatic device, and the slow release of air produces the delay.
Mechanical
The ? timing relay offers time delays over a greater range and with far better accuracy than the other two types of timing relays.
Electronic
An ? timer is a device with a preset time period between energizing the timer or applying the input signal and the action of the timer output contacts. During the timing period, no change occurs in the timer output contacts.
On-Delay
What type of contacts activate when the timing relay is energized and return to their original state when the timing relay is de-energized?
Instantaneous
Once initiated, ? contacts change state after a set time period has passed. Once the time has passed, all normally open timed contacts close and all normally closed timed contacts open.
DOE
An ? timer is a device with a preset time period that starts after the input signal is removed. The timer output contacts change when the input signal or external trigger is applied, and the contacts remain in the changed state until after the timing period.
Off-Delay
The off-delay timer function is also called a ? .
DODE
Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact prior to power being applied to the coil?
Closed
Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact immediately after power is applied to the coil?
Closed
Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact 30 seconds after power is applied to the coil?
Open
Assume a DOE timer is configured with one normally closed contact with a time-delay of 30 seconds. What is the position of the contact as soon as power is removed from the coil?
Closed
Which timer is appropriate for keeping a motor starter energized after power is removed from the timer’s power input?
DODE
What is the abbreviation for delay on de-energize?
DODE
Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact prior to power being applied to the coil?
Closed
Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact immediately after power is applied to the coil?
Open
Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact 20 seconds after power is removed from the coil?
Open
Assume a DODE dashpot timer is configured with one normally closed contact with a time delay of 30 seconds. What is the position of the contact 30 seconds after power is removed from the coil?
Closed
True or False?
Motor control drawings show their components in the “Normal” de-energized state.
True
Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact prior to the input of the external trigger switch?
Open
Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact immediately after an input signal is received from the external trigger?
Closed
Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact immediately after the input signal is removed from the external trigger?
Closed
Assume a DODE solid-state timer is configured with one normally open contact with a time delay of 10 seconds. What is the position of the contact 10 seconds after the input signal is removed from the external trigger?
Open
A conveyor may be required to run for a period of time after a stop circuit is activated to assure the product is cleared from the conveyor, this would be an application for which type of timing relay?
DODE
After a start signal is received to start a pump motor, a time delay is required to allow time for pre-lube to the pump. This would be an application for which type of timing relay?
DOE
The current carrying capacities for most timing relays is ? .
10A
What are the 3 types of timer configurations?
-Dashpot Timer: Mechanical
-Synchronous Timer: Electrical
-Solid State Timer: Electronic
Mechanical and electronic timers are often called?
Timing Relays
? means that when the timer is turned on, the time delay starts. When the timed delay is complete, the contacts change from closed to open, When the timer is turned off, the contacts return to the closed position.
Normally Closed, timed open (NCTO)
? means that when the timer is turned on, the timed delay starts. When the timed delay is complete, the contacts changed from open to closed. When the timer is turned off, the contacts return to the open position.
Normally open, timed closed (NOTC)
? has power applied to the electronics and a trigger signal used to initiate the time and start the time delay. The contacts changed state after the trigger signal is active. They remain in the changed state after the trigger signal is deactivated for the duration of the set delay. After the delay period the contacts return to their original position.
Off delay electronic timer
? is a timing device that opens and closes a contact depending on the position of the hands or dials on the clock.
Synchronous timer
? are timing devices that provide a time delay by controlling the rate of fluid flow through a constricted orifice
Dashpot timers
? is a timing device on which a set time delay is initiated when the timer is turned on. When the set delay elapse, the contacts change positions.
on delay timer
