Page 37 - Airstream™ Series Dryer

AIRSTREAM™ SERIES DRYER

Electrical Overview

Pro Airstream™ Dryer
Programmable Logic Controller (PLC)
The programmable logic controller (PLC) is a computer device mounted on the control sub-plate. It
drives two outputs with internal logic based on the signals from six input devices. The following
describes the function of input devices, output devices and indicators pertaining to the programmable
logic controller (PLC) sometimes referred to as the (PLC).
The PLC uses a low-logic active state: i.e., zero voltage activates inputs (sinking inputs).
Input 0 - Entrance Photo Eye and Dryer Up
By default, the light on the Programmable Logic Controller that corresponds with the “Entrance” photo
eye is on. When the entrance photo eye is blocked, it causes the lamp marked Entrance Photo Eye or X0
on Programmable Logic Controller to go off. This input signal will cause output Y1 to activate the “UP”
direction. This input can be wired through an external dry contact in the CCU to control the “Dryer Up”
function. The unit is shipped from the factory with a jumper between PE1 and UP1. this jumper will allow
the unit to run with the nozzle in a normally down position.
If the jumper is removed and wired to a dry contact, the dryer will function as follows:
When wired as NO, the top nozzle defaults in the “UP” position. Adversely, when wired as NC, the top
nozzle defaults in the “DOWN” position
Input 1 - Hold Photo Eye
By default, the light on the Programmable Logic Controller that corresponds with the “Hold” photo eye is
on. When the “Hold” photo eye is blocked, causing the lamp marked Hold Photo Eye on the
Programmable Logic Controller to go off. This input signal will cause no output lights to light, and will hold
the center nozzle in place until the input is remover or one of the up photo eyes is broken.
Input 2 - Exit Photo Eye
By default, the light on the Programmable Logic Controller that corresponds with the “Exit” photo eye is
on. When the exit photo eye is blocked, it causes the lamp marked Exit Photo Eye or X2 on
Programmable Logic Controller to go off. This input signal will cause output Y1 to activate the “UP”
direction.
Input 3 - Down Proximity Limit
When the top nozzle travels to its lower limit, the Down Limit Proximity Sensor supplies input to terminal
X3. This causes the Down Limit Proximity lamp on the Programmable Logic Controller cover to light. This
input signal will deactivate output Y2 and cause the Nozzle Down lamp on the Programmable Logic
Controller cover to turn off.

Input 4 - Up Proximity Limit
When the top nozzle travels to its upper limit, the Limit Proximity Sensor supplies input to terminal X4.
This causes the Up Limit Proximity lamp on the Programmable Logic Controller cover to light. This input
signal will cause output Y1 to deactivate and the Nozzle Up lamp on the Programmable Logic Controller
cover to turn off.

1MANUL021 Belanger , Inc. * 1001 Doheny Ct. * Northville, MI 48167 * Ph (248) 349-7010 * Fax (248) 380-9681 35