Procedure Overview

In this procedure, you will design a control circuit to perform a cylinder dwell using a time$-$delay relay.

$-1.$ Solve the following design problem.

Design a circuit to perform the following functions:

$-$ When the start pushbutton $1$PB is pressed, the cylinder will extend and dwell for five seconds.

$-$ After the five seconds have elapsed, the cylinder will retract. Draw your circuit design on a separate piece of paper.

$-2.$ Set up the $990-$EC$1.$

$-3.$ Connect the air supply to the system.

CAUTION

DO NOT EXCEED $100$ psig$/690$ kPa WHEN USING THIS PANEL.

$-4.$ Connect the circuit that you designed in step $1.$

$-5.$ Turn on the main power switch.

$-6.$ Perform the following substeps to operate the control circuit.

A$.$ Set the timer control knob to $5$ seconds.

B$.$ Press $1$ PB and observe the cylinder.

Cylinder Status

$($Extends$/$Retracts$)$

The cylinder will extend fully. After $5$ seconds it will retract$\mathrm{.}7.$ Repeat step $6$ with different timer settings, observing the dwell time of the cylinder each time$\mathrm{.}8.$ Demonstrate the circuit to your instructor.

This is part of your skills assessment$\mathrm{.}9.$ Place a copy of your circuit design in your portfolio.

$-10.$ Shut down the system.