motor controls lesson 8

The current carrying capacities for most timing relays is ? .

10 A

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

The off-delay timer function is also called a ? .

DODE

What is the abbreviation for delay on de-energize?

DODE

Which timer is appropriate for keeping a motor starter energized after power is removed from the timer's power input?

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

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

Identify each set of pin numbers that are normally open in the 11-pin base wiring diagram.

I. and V.

Identify the normally open sets of contacts in the eight-pin relay wiring diagram.

I. and V.

Identify the normally closed sets of contacts in the eight-pin relay wiring diagram.

II. and IV.

Identify each set of pin numbers that are normally closed in the 11-pin base wiring diagram.

II. and V.

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

Match the proper symbol to the correct abbreviation.

NOdoe NCdoe NOdode NCdode

What are the pin numbers, for the common pins, associated with each set of normally open and normally closed contacts in the 11-pin base wiring diagram?

Pin 1 and 11

Identify the pin numbers where the constant voltage source is to be connected in the 11-pin base wiring diagram.

Pin 2 and 10

Applying power to which pins in the eight-pin relay wiring diagram will turn on the timer and begin (initiate) the time delay?

Pin 2 and 7

Identify the pin numbers where an external trigger switch is to be connected in the 11-pin base wiring diagram.

Pin 5 and 6

Identify the common connection pin for normally open Pin 6 in the eight-pin relay wiring diagram.

Pin 8

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

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 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 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

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 prior to power being applied to the coil?

closed

The ? timing relay offers time delays over a greater range and with far better accuracy than the other two types of timing relays.

electronic

The ? timing relay typically uses a pneumatic device, and the slow release of air produces the delay.

mechanical

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

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

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 immediately after power is applied to the coil?

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 10 seconds after the input signal is removed from the external trigger?

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 prior to the input of the external trigger switch?

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 30 seconds after power is applied to the coil?

open

Motor control drawings show their components in the "Normal" de-energized state.

true

Timers enable a multitude of operations in a control circuit to be started and stopped at different intervals.

true