Automatic Input Devices

Four common types of automatic input devices are: ___________ switches, float switches, pressure switches, and electronic sensors.

Limit

The two main components of a limit switch are the _____________ mechanism and the contacts

Actuating

Limit switches are often used as safety ________.

Interlocks

The ladder diagram for any limit switch includes a switch bar with a(n) ___________ attached to it.

cam

Limit switch symbols are sometimes shown in the actuated or ____________ switch.

held

All ___________ switches include a device that senses the level of a liquid.

Float

A float switch can contain _____________ sets of contacts just like the limit switch

Two

A(n) ________ pumping operation uses a circuit that is designed to pump liquid out of a tank.

Sump

A(n) ___________ float switch is often used to keep a tank filled to a desired level.

Normally closed

A(n) ___________ float switch is most often used to control a sump pump

Normally open

___________ control involves connecting motor starters so that the operation of one motor depends on the state of another motor.

sequence

One application of ON/ON sequence is the high pressure lubrication on a(n) _____________

Milling

A(n) ________ system is a common application for sequence control of motors

conveyor

A common application of a(n) ___________ sequence is a mill that must stop before the lubrication stops.

OFF/OFF

The reason to have the main conveyor line ___________ before the secondary feed lines to avoid having products pile up on the main conveyor

start