Procedure Overview

In this procedure, you will design a control circuit that will perform a continuous$-$cycle, dual$-$cylinder synchronized operation, with automatic and manual modes.

$-1.$ Solve the following design problem.

Design a circuit that will perform the following functions:

$-$ The circuit should perform a continuous dual cylinder operation.

$-$ The retraction of the cylinders should be synchronized.

$-$ The circuit should have both an automatic and a manual mode.

$-$ In the automatic mode, the cylinders should cycle continuously.

$-$ When the manual mode is selected, the automatic circuit is locked out and each cylinder can be jogged individually by its own jog pushbutton.

Draw your circuit design on a separate piece of paper.

$-2.$ Set up the $990-$ECl.

$-3.$ Make sure the air supply is connected to the system.

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

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

a $6.$ Perform the following substeps to operate the circuit.

A$.$ Place the selector switch $1$SS in the right$-$hand position and observe the cylinders.

Cylinder I status

$($Cycling$/$Not Cycling$)$

Cylinder $2$ status

$($Cycling$/$Not Cycling$)$

Both cylinders should be cycling.

B$.$ Notice if the cylinders are synchronized during retraction.

Both cylinders should retract only when both limit switches are energized.

C$.$ Place ISS in the center position and observe the cylinders.

Cylinder I status

$($Cycling$/$Retracts and stops$)$

Cylinder $2$ status

$($Cycling$/$Retracts and stops$)$

Both cylinders should retract and stop because the center position is the OFF position.