Programmable Logic Controller Basics

EET3370 LAB 3 – RELAY TIMERS

Name

Wire the control circuit given below. Use it, along with the Timing diagram showing how timer contacts respond on page 2, to study how the time delay relays work. Energize and de-energize TD1 and TD2 and carefully note how the various types of contacts function. Note that both TD1 and TD2 have contacts which delay and contacts which work instantaneously.

When you are sure you are comfortable with your knowledge of these relays and their contacts, wire the circuit on the last page. When it is working, have your instructor sign your lab. Fill in the timing diagram for the circuit on the last page and turn in your lab with your name at the top. Disconnect your circuit and put the trainer away before you leave.

Timing diagram showing how timer contacts respond.

Timing Relay Circuit