Timers and Smart Relays Flashcards
Name three basic types of timing devices used in electrical circuits
spring wound, mechanical/electrical, time relays
Describe three methods of controlling the timing of a timing relay
air, fluid, electronically
pneumatic, fluid dash pot
What does TDOE mean?
time delay on energization
What does TDOD mean?
time delay on de-energization
Name three additional functions that may be provided by a multi-function timing relay
interval, one shot, repeat
When a multi function timing relay is set for one shot timing, how is the timing initiated?
a signal at the start terminal
Describe a repeat cycle timing function
repeat cycle timing has a timed repeating changed and normal period for the timed contacts. The cycles repeat until the relay is de-energized
What programming languages can a smart relay be programmed with?
function block or ladder logic
What are smart relays often compared to?
mini- PLCs
Name some functions of a smart relay
1) small machinery automation
2) lighting management
3) access, control, surveillance management
4) heating and air conditioning management
5) automatic control and sequencing for car washes
6) automatic door control
7) decentralized automation systems to medium or large machinery
Can a smart relay be used with multiple voltages?
yes
Can smart relays be used as a latching relay?
yes
Can smart relays control devices outside of the relay itself?
yes
Can smart relays use a real-time clock?
yes
What are four of the timer functions that smart relays are capable of?
on delay timing
on delay timing with momentary input
off delay
one shot
one shot when input is removed
repeat cycle with a maintained input
repeat cycle with a momentary input
totalizing timer with reset
