CDA PC44 Instruções de Operação descarregar pdf (Página 44)

3·22

Installation

Aligning

Sensors

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Figure 3.

-Al

ignment LED and gain

control locations

- Gain control

Light/dark operate switch

- Cable opening

-Alignment

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1193

Alignment

Indicator

Nordson photosensors have an alignment indicator (LED).

The

LED

pulse (flash) rate increases as

alignment improves. The sensor is

adjusted so that the LED is off (not flashing) in the dark condition or is

(flashing) at a fast rate in the light condition.

The LED flash rate also indicates when sensor maintenance is needed.

Whenever the flash

rate is slow, the sensor's lenses should be cleaned

and the

alignment checked.

Proceed to the instructions for aligning the type

sensor that you are

using.

Aligning

Diffuse Reflective (Proximity) Sensors

NOTE: Before adjusting the gain control, make sure that any

background objects (e.g., moving machine parts which would pass

through the sensor's field

view during operation) are present in the

sensor's line of sight during adjustment.

1. Remove the gasketed acrylic cover located above the sensor

electrical cable.

2. Turn on power to the sensor.

3. Direct the infrared sensor light beam

the substrate and

observe the red alignment LED (Figure 3.14).

Turn the gain control until the LED is flashing on and off.

5. Move the substrate and, if possible, any background objects out

the sensor's field

view. If the LED stays off, no further adjustment

is necessary.

NOTE: The gain control is a 15-turn pot which does not have a stop

position. The gain control ratchets

the end

its travel.

If the LED remains on, turn the

in control counterclockwise by

1..2

turn increments until the sensor comes on only when it "sees" the

substrate, but goes off when the substrate is removed.

If the LED still

remains on after you turn the gain control fully counterclockwise,

remount the

sensor further from the substrate (but no further away

than 15 in.

38.1 em).

If you are connecting other devices

this time, proceed

the

appropriate installation procedure(s) in this section.

Nor

dson

Corpo

rat

ion

1993

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