Allen-Bradley GuardShield Type 2 Especificações descarregar pdf (Página 11)

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Publication S117-CA001A-EN-P

Presence Sensing Safety Devices

Safety Light Curtains

2-11

Overview

GeneralPrinciples

2-Opto-electronics

Safety SwitchesOperator

Interface

LogicPower

Conveyorized muting

Muting sensors are typically used in pairs and depending upon the

sensor configuration and muting module, allow either uni-directional

or bi-directional travel of material through the safety light curtain.

Machine Conveyor

Material

Muting Lamp

MS2MS1

Muted LC1

LC2

Machine Conveyor

Material

Muting Lamp

MS4 MS3 MS2 MS1

Muted LC1

MS2 MS1

Muting lamp

GuardShield Perimeter Access Control (PAC)

Figure 4

 Optic heads (operate on 24V DC)—ordered as a pair

(transmitter/receiver) mounting brackets included

 Cables—separate 4-pin transmitter and 8-pin receiver

 Safety relay if EDM is not used

 Corner mirrors (for multiple side protection)

Muting lamp

MS1

MS2

Figure 4: Two-sensor T-type with MSR42

Figure 3: Two-sensor L-type with MSR42

Figure 2: Four-sensor uni-directional muting

Figure 1: Two-sensor bi-directional muting

The muting sensors must be spaced appropriately from the safety

light curtain and each other in order to ensure that the sensors

cannot be interrupted by personnel, causing the activation of the

muting function.

A requirement of muting in machine applications is for indication

that the muting function is activated. This is typically accomplished

by the use of a muting lamp. The various muting modules offered by

Rockwell Automation have an output for the connection of a muting

lamp.

Four-sensor muting for this particular muting module in Figure 2

allows a single direction of travel. A particular sequence is also

required in this configuration; muting sensor 1 must be interrupted

first followed by muting sensor 2 and then the safety light curtain,

then muting sensor 3 and finally muting sensor 4. It is necessary

with this particular muting module to have the light curtain’s sensing

field interrupted within 3 seconds of muting sensor two being

interrupted. Also, the material must block muting sensor 3 and

muting sensor 4 before clearing muting sensors 1 and 2 or the

muting function is overridden and the safety light curtain would

become active causing a nuisance shutdown of the machine if the

material is within the light curtain sensing field.

An interruption of the safety light curtain sensing field would cause

the machine or the hazardous motion to be turned off. The muting

cycle is completed when the material clears muting sensor 4.

The Allen-Bradley Guardmaster GuardShield PAC safety light curtain

system is a two-box design. This means the safety light curtain

does not need a separate controller to operate in a guard-only

mode with manual reset. Therefore, the safety outputs of the light

curtain (OSSDs) can be connected directly to any safety relay that

will accept PNP inputs.

The following are some common configurations of light curtain

systems. The numbers on the drawing indicate the ordering steps to

follow to ensure that a complete system is specified.

Components required for a multiple-beam PAC system, see

Figure 3:

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 115 116

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