Safety E dges - RS Components · 2-90 Presence Sensing Safety Devices Safety E dges O verview...

2-90

Presence Sensing Safety Devices

Safety E d gesO verview

System C o m p o nents

The Safedge sensitive edge systems are used in a variety of

applications where the edge of an object must be detected by

contact. The Safedge system consists of three parts: 1) a c-rail, which

is used to mount the profile; 2) a profile, which contains the sensing

surface; and 3) a control unit, which checks the operation of the

profile and interfaces with the control system. A typical system is

shown below.

O p erating Princip le

The profile works on the principle of a two-wire design with

conductive rubber. Two wires run the length of the profile. The

wires are terminated with a known resistor. W hen the profile is

deformed, the conductive rubber comes in contact with each other

and causes the overall resistance to drop.

The control unit provides a voltage source to the wires in the profile.

It continuously checks the continuity of the wires for shorts, opens

and changes in resistance. If the circuit opens, becomes shorted, or

the resistance changes, the output of the control unit turns off.

The control unit can also be used to monitor the performance of the

output switching devices.

SAFEDGE

RUN

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Fully Cross Monitoring System

Supply Voltage 240/120Vac (see selector) 50Hz 0r 24Vac/dc

IP65 Hoseproof, Dust tight & Impact resistant to IEC 529

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Sensing Su rface

The profile is best actuated along its sensing surface. The sensing

surface of the Safedge system is active along almost the full length of

the edge. The 10 millimetres at the beginning and end are not active.

One distinct advantage of the Safedge system is the active corners.

Pressure applied to the corners is detected by the control unit.

F o rce T ravel R elatio nsh ip

Since the Safedge system is a contact device, a force is required to

operate the device. This force is dependent on the shape of the

object applying the force, the speed of the object and deformation

distance on the profile. To help understand the force requirements,

the European standard EN1760-1 provides three test objects

travelling at two speeds. Shown in the graph below is the force that is

applied over the deformation distance on the surface of the profile.

Note that the force required to operate the corners is greater than

the force required along the straight section of the profile. This force

must be used as a guideline, as the inanimate object can not be

harmed.

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2-91


Safety EdgesOverview

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Risk A ssessment

A risk assessment must be performed to determine the proper use

of the edge system. Additional protective measures must be used

when an individual can reach around or over the edge system and

gain access to a hazard. The edge system is designed to be a contact

type of system. Therefore “cushion factor” is an important

consideration.

Selecting the Cushion Factor

One of the important characteristics of edge systems is called

cushion factor. The cushion factor is the distance the profile can be

depressed after the signal is generated. This is important when the

profile is mounted on automated doors.

Automated doors will continue to close for some finite time after the

profile sends the initial stop signal. This is known as the system

response time. The system response time is the sum of the Safedge

control unit response time, the control system response time, and

the mechanical stopping time. Systems with longer response time

should utilize larger cushion factors. Users must validate that injury

does not occur if parts of the body get jammed, for example

between the sensing edge and the fixed part of a machine.

Users might also consider a reversing option. When the profile is

depressed, the Safedge control unit sends a signal to a reversing

relay. Since the reversing relay is not a safety rated device, the user

must still confirm that injury does not occur if parts of the body get

jammed.

2-92



Typical Applications

Typical applications for sensitive edge systems are:

• Sliding doors

• Sliding gates

• Automated guided vehicles

• X-Y tables

• Fence tops

• Scissor jacks

• Loading platforms

The profile is mounted on the leading edge of the moving object. As

the profile comes in contact with an object, the sensing surface of

the profile deforms. The deformation causes the conductive rubber

parts to make contact and reduce the circuit resistance. The control

makes contact.

Typically, the edge of the object is leading edge and is moving, like a

sliding door or gate. Edge systems have also been used on the

leading edges of X-Y tables and automated guided vehicles.

In some applications, a drip edge or seal is needed to reduce wind

and rain leaking into a door. The Safedge system accommodates

both types of applications. Safedge has three profiles that include a

sealing lip.

Safedge can also be ordered with a rubber cover as shown below.

This allows compression of the rubber boot without deforming the

profile.

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2-93



Cab le Termination

The cable can be terminated in one of four ways providing flexibility

in design and installation of cable routing. Specify the LHT or RHT

from the point of view of looking directly at the end of the profiles

as shown below.

Connection M ethods

The profiles can be connected in one of two ways: series or parallel.

Either method provides the same performance. Selection of the

method is determined by ease of installation. The more popular

method is series.

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Safety Contacts 250V 2A N/O Aux Contacts 250V 2A C/OSafedge Strip Voltage 6Vdc

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2-94


Safety EdgesSafedge™ Profiles

DescriptionThe ability of the Safedge profile to out perform competition lies in

its innovative design. It uses a combination of non conductive

rubber and flexible wire cored conductive rubber bonded together

so it keeps bouncing back into shape even after repeated

compressions.

The Safedge profiles come in 3 different cushions factors: 5mm

(0.2in), 19mm (0.75in) and 41mm (1.6in). Cushion factor is the

distance the profile can be depressed after a signal has been

generated. The profiles are also offered with a sealing lip which is

designed to reduce drafts between the profile and opposing surface.

The profiles come in two different materials. Use the EPDM

material in the presence of conductive fluids. The NBR/CR material

performs better in the presence of oils. Review the chemical

resistance chart to help make the best choice of material. If in doubt,

a small sample of the profile should be tested for chemical resistance

before a final selection is made.

The Safedge profile has no rigid internal parts which can “break

through” or cause fatigue failures after prolonged use. The multi-

stranded copper wire core throughout the length of the strip insures

that there are no problems of resistance build up on long lengths.

Features

• Various profiles

• Conductive rubber technology

• Up to 50m lengths

• Aluminium, plastic or zinc coated steel, mounting rails

• Rubber boot optional

• Active corners

• Sealing lip available

Specifications

Chemical Resistance of Safedge Profile

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2-95


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2-99


Product Selection—Component PartsA:B CEDFHGB IF JLK6CED A:DGMNB OQPB IF RKPSKT IHUVQDLJLVHCEWHDN

X;YZZ[\#] Y^_#Z`X_#ab [cd [YZb eLYZf:g Zgh^7Y6i g b [jlkm nnop'q r:sstscd [YZb eLYZf:g Zgh^7Y6i g b [jlum nnop'q r:sstvcd [YZb eLYZf:g Zgh^7Y6i g b [jlwm nnop'q r:sstx

y [^Smg Z_] Y^ cd [YZb ezYZf:g Zgh^7Yi g b [j| Ω e[b b Y~^[ d g d ] Y^i Y^ d [^7g [ d ] [^7m:g Z_] g YZnnop'q r:sst

Xb Y d g Z;X_ cd [YZb ezYZf:g Zgh^Yi g b [jX;b Y d g ZX_m_] [^7g _#b hf nnop'q r:svst

XHeQ_ZY\#^ eb _] [`[ d g S[ X;YZ] [Z] d u#i i g \g [Z]'i Y^_^7Yg m_] [b ek] [^7m:g Z_] g YZ d nnop'q r:ooo

[_#^ d cd [] Y3\#]^ Yi g b [ d nnop'q r:votn

X;YZZ[\] g YZ:Y6hYb e\_#^7aYZ_] [!Y d g Zwummwummuwmm\#Ymb [] [~g ] :] ~Y3Yb [!] [^Smg Z_b_#Z`] ^7m:[]] e[ d \^[~YZ:\#YZZ[\#] Y^~g ] d ] ^S_g Z_#Z`:^[b g [i6\#b _m:Y^ d [~g ] \Yg b [`:\#_ab [

nnop'q r:oss

X;Yg b [`:XYZZ[\] g YZX_#ab [ wm i ] [] [Z`[`Yi6i b [g ab [\#Yg b [`:\#_#ab [ nnop'q r:nxou wm kk wi ] [] [Z`[`Yii b [g ab [!\#Yg b [`\#_ab [ nnop'q r:oo

Example application of profile using coiled cable. The

coiled cable can not be directly connected to the profile

due to the weight of the cable. The proper use of the coiled

cable is to connect the coiled cable to the profile through

the connection box. The coiled cable should be secured to

both the moving and stationary objects so as to prevent

straining of the terminal connections.

#¡¢ £#¤ ¥ ¡ # #¦§¡#¥ ¨©

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2-100



Factory Assembled Product Selection (standard

profile)

µ

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¸3¸L¹Eº»¼➊ ½ ¾ ¿ À ¹EÁ;Â3Ãz¹

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ÆÇÈÉ Ê Ë ÌÍ ÈHÎQÌ ÏÌÐ#ÑÇÊ ÒQÓSÊ ÈHÔÕ Ö×#× Ö#ØÙ Ö×#× ÖQÚÛ Ö×#× ÖÜÝ Ö#ÞQ× Ö#Øßà á âØãäå à æ#ç!è#à éêæÚà çâ#áØ6à ëãì × í× Ö#Øî × í× ÖÜï Ö#ðÖ#ñ#Øßà á âØãäå à æ#ç!è#à éêæÚà çâ#áØ6à ëãò Ö#ó× Ö#Øô Ö#õQ× Ö#Øßà á âØãäå à æ#ç!è#à éêæÚà çâ#áØ6à ëãö Ö#Þ× ÖØ'ßà á â;Ø7ãäå à æ#çèà éêæè ã÷ áØ6à ëãø Ö#ð#Ö#ñØ'ßà á â;Ø7ãäå à æ#çèà éêæè ã÷ áØ6à ëãè Ö#õ× ÖØ'ßà á â;Ø7ãäå à æ#çèà éêæè ã÷ áØ6à ëãÜ ÚSùú#ú#ãûHÙêêáêüãûÖ×#× ÖØý ÚSùú#ú#ãûHÙêêáêüãûH× í× ÖØ

þ Íÿ Ê ËÍ ÈHÎHÌ ÏÌÐ#ÑÇÊ ÒQÓSÊ ÈHÔÕ × õ× õ;äå ùà æà ù ÷ êûû ê÷ à å ã êëãHÕSèÙ ×#×#× õà æ7êäá ãë á ããå ÷ êûû ê÷ à å ãêëãQÕSèÛ × õ× õÙ Û úå ä÷ êû #û ê÷ à å ã Sêë#ãHÕSèÝ × õ× õÚ Û û ãë;÷ ê'ûû ê÷ à å ãêë#ãHÕSèì × õ× õ ! Û!" ãå å êß ÷ ê'ûû ê÷ à å ãêëãHÕSèî × õQ× ñäå ù:à æà ù ß!à á âüãû áSà äåå à é÷ êûû ê÷ à å ã 7êëãHÕSèï × õ× Þäå ù:à æà ù ß!à á ââ#ê'û à 7êæ#á äå#å à é÷ êûû ê÷ à å ã 7êëãHÕSèò × õ× íäå ùà æQà ù ëããéû äà å ÷ êû û ê÷ à å ãêë#ãHÕSèö õQ× ÞQ×äå ùàæà ù ÷ êû #û ê÷ à å ã7êë#ã;Ü3ä æë ýÜ Üê Û ÚSäà å# æ#êáæ#ããëãë$

Í%& Ë Ì(''ÔHÓÇ ÔQÑÌÍ ÈHÎQÌ ÏÌÐ#ÑÇÊ ÒQÓSÊ ÈHÔÕ èò)4å ã÷ áãæ#áû äæSãßà á â× *ä7úå ãÙ èò)4å ã÷ áãæ#áû äæSãßà á âõ*ä7úå ãÛ èò)4å ã÷ áãæ#áû äæSãßà á âó*ä7úå ãÝ èò)4å ã÷ áãæ#áû äæSãßà á âÞ*ä7úå ãì èò)<åã÷ áãæáû äæãß!à á â× Ö*7ä7úå ãî Ú6ò)<û à çâ#áãæ#áû äæ7ãßà á â× *7äúå ãï Ú6ò)<û à çâ#áãæ#áû äæ7ãßà á âõ*7äúå ãò Ú6ò)<û à çâ#áãæ#áû äæ7ãßà á âó*7äúå ãô Ú6ò)<û à çâ#áãæ#áû äæ7ãßà á âÞ*7äúå ãö Ú6ò) û à çâ#áãæ#áSû ä æãßà á â× Ö*äúå ãø Ø6ì ) á#û äà çâ#áãæ#áû ä æãßà á â× *7äúå ãè Ø6ì ) á#û äà çâ#áãæ#áû ä æãßà á âõ*7äúå ã

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➊ Order controller separately. See page 2 -1 0 4 for selection details.

Í%& Ë Ì('ÔQÓÇ ÔQÑÌÍ ÈHÎQÌ Ï:ÌÐ#ÑÇ#Ê ÒHÓSÊ ÈÔö Ú6ò) û à çâ#áãæ#áSû äæ7ãßà á â:× Ö*äúQå ãø Ø6ì )% áû äà çâ#áãæáSû äæ7ãß!à á â× 6ä7úå ãè Ø6ì )% áû äà çâ#áãæáSû äæ7ãß!à á âõ6ä7úå ã7 Ø6ì )% áû äà çâ#áãæáSû äæ7ãß!à á âó6ä7úå ãÜ Ø6ì )% áû äà çâ#áãæáSû äæ7ãß!à á âÞ6ä7úå ãý Ø6ì )% áSû äà ç7â#á6ãæ#áû äæãßà á â× Ö*7ä úQå ã 8'ÜÝì#Úãæ#áSû äæ7ãßà á â:× 9Säúå ã: 8'ÜÝì#Úãæ#áSû äæ7ãßà á âõ*7äúå ãÚ 8'ÜÝì#Úãæ#áSû äæ7ãßà á âó*7äúå ãØ 8'ÜÝì#Úãæ#áSû äæ7ãßà á âÞ9Säúå ã) 8ÜÝì#Úãæ#á#û äæ7ãßà á â3× Ö*ä7úå ã

;ÌÇ< Ê Ô ÓÊ ÈHÔÍ ÈHÎQÌ Ï:ÌÐ#ÑÇ#Ê ÒHÓSÊ ÈÔÕ è#ò)<åã#÷ áã=à á6ßà á â:× *äúå ãÙ è#ò)<åã#÷ áã=à á6ßà á âõ*äúå ãÛ èò)<åã#÷ áã=à á6ßà á âó*äúå ãÝ è#ò)<åã#÷ áã=à á6ßà á âÞ*äúå ãì è#ò)4å ã÷ á6ã=à áß!à á â× Ö*7ä7úå ãî Ú6ò)4û à çâ#á6ã=à áßà á â:× *7äúå ãï Ú6ò)4û à çâ#á6ã=à áßà á âõ*7äúå ãò Ú6ò)4û à çâ#á6ã=à áßà á âó*7äúå ãô Ú6ò)4û à çâ#á6ã=à áßà á âÞ*7äúå ãö Úò)<û à çâ#áã=à á6ß!à á â3× Ö*7äúå ãø Øì )% áû äà ç7â#áã=à á6ßà á â× *ä7úå ãè Øì )% áû äà ç7â#áã=à á6ßà á âõ*ä7úå ã7 Øì )% áû äà ç7â#áã=à á6ßà á âó*ä7úå ãÜ Øì )% áû äà ç7â#áã=à á6ßà á âÞ*ä7úå ãý Ø6ì )% áû äà çâ#á6ã=à áß!à á â:× Ö*7äúå ã 8'ÜÝìÚã=à áßà á â:× 6äúå ã: 8'ÜÝìÚã=à áßà á âõ6äúå ãÚ 8'ÜÝìÚã=à áßà á âó6äúå ãØ 8'ÜÝìÚã=à áßà á âÞ6äúå ã) 8Ü;Ýì#Úã=à á6ßà á â3× Ö*7äúQå ã8 äû äå å ãå )Sãû à æä áà êæ>l× Þ

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2-101



Factory Assembled Product Selection

(mini-profile)

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X

Y

➊ Order controller separately. See page 2-104 for selection details.

c% a b(Pkj[ khbc ]db eEbgh[` ijB` ]_k p E B x ~yB yEn u* l p E B x ~yB y/qu* p E B x ~yB y/tu* ¡\Py yEn u* ¡\Py y/qu* p ¡\Py y/tu* ¢b[£¤` k j` ]kc ]db eEbgh[` ijB` ]_k p E B x ~yB yEn u* l p E B x ~yB y/qu* p E B x ~yB y/tu* ¡\Py yEn u* ¡\Py y/qu* p ¡\Py y/tu* ¥ pB x ufx yBx y¦!o

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2-102



Factory Assembled Examples

¯¯°±_² ³\´µE¶3·¸°¹º»°

This is a single oil resistant profile which is 1250mm long. The edge

is terminated with a Series Termination. A 1m cable enters straight

into the closing cap from a DIN-rail mounted controller. The profile is

mounted on a standard aluminium C rail.

¯¯°±_² ³P¼E±½·3°°¯¾°

This is single profile has a sealing lip and is 490mm long. The profile

is terminated with a Series Termination. A 3m cable enters into the

right hand side of the closing cap from a plastic surface mounted

controller. The profile is mounted on an aluminium rail with a vertical

lip for ease of mounting. The orientation of the sealing lip to the

vertical lip can be reversed by the user by sliding the profile out of

the C Rail, rotating the C Rail 180° and then re-inserting the profile

back into the C Rail.

¯¯°±_² ³\´±_¿J¼f°¹º»°

This is a single oil resistant profile which is 1250mm long. The edge

is terminated with a 1m cable. A 1m cable enters straight into the

closing cap. The profile is mounted on a standard aluminium C rail. A

control unit is not included. This edge is intended to be used in series

with another length of edge which has a terminating resistor.

¯¯°±² ³PÀ3¿f´%ÁJ°Â»Ã°

This is a red-coloured single profile which is 3560mm long. This

profile is part of a parallel profile system, for ease of mounting, as it

is terminated with a Parallel Termination. A 3m cable enters into the

left side of the closing cap from a plastic surface mount controller.

The profile is mounted on an aluminium C Rail with a horizontal lip

for ease of mounting. The horizontal lip can be reversed by the user

by sliding the profile out of the C Rail, rotating the C Rail and then

re-inserting the profile back into the C Rail. A separate catalogue

number must be entered for the other profile.

ÄÅ ÆÇÈ%ÉÊÊËÌÍÍ\Î ÏÐÑ ÒÏÐÓÉÕÔ_ÖÑ Î

×ØÙ Å!ÉÖÚÎ È Ù ÒÛ ÜBÖÒÝÈÞ Ñ Û ß%ÊÐwÉ¸ÖÚÎ È

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êØ È ÜBÑ È ä\ÅÈ ÜBÐÑ ÒÖÛ Ñ æÒëìΩ

êØ È ÜBÑ È ä/ÅÈ ÜBÐÑ ÒÖÛ Ñ æÒëì

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íÅ ÆÇÈÊËÊî%Í/Î ÏÐÑ Ò ÏÐÓÔ_ÖÑ ÎÞ Ñ Û ßEïÈ ÜÛ Ñ ÝÖÎðÑ Ç øÔ_òÅóùÔ_Ñ éßÛòÖÒôÙ ÒÛ ÜÖÒÝÈ Þ Ñ Û ß%ËÐÓÉ3ÖÚÎ È

öð ò¸Å(É¸ÖÚÎ È Ùú Ñ ÛèÐ à

Å ÆÇÈáÊÊáâ ã Ñ ÎÔ_È äÑ äÛ ÖÒÛ_åÜæç Ñ Î ÈÊËèáÐÐÓÎ æÒé

øÅ ÆÇÈ%ÊËÊè%Í/Î ÏÐÑ Ò ÏÐÓÔÖÑ ÎÞ Ñ Û ßEò¸æÜÑ ûBæÒÛ ÖÎðÑ Ç

üåÖÜBÖÎ Î È ÎÅÈ ÜBÐ%Ñ ÒÖÛ Ñ æÒÊèì

Ω ýÅ ÆÇÈáÊÊáÔEåÜæç Ñ Î ÈõèëáÐEÐwÎ æÒé àðòÅó Ù ÒÛ ÜBÖÒÝÈÞ Ñ Û ßõÐÓÉ3ÖÚÎ È

2-103


Safety EdgesSafedge™ Controllers

DescriptionThe Safedge controllers are designed to operate with the Safedge

profiles. The controller continuously monitors the profile for

actuation and generates an output signal when the profile is

depressed.

The Safedge controller provides a low voltage to the profile. When

the profile is pressed, the controller detects a change in resistance

and turns off its output relays. When pressure is released from the

profile, the output relays of the controller return to an on state. The

controller has redundant voltage free positively-guided output relays

which can be used to interface with a machine control system.

The ‘251’ controller comes capable of operating at 24V AC/DC, or

120/230V AC from separate terminals. An internal switch changes

the operating voltage from 120V AC to 230V AC. The ‘252’

controller operates at 24V AC/DC.

An auxiliary output relay is available to provide a signal about the

controller’s status. Three LEDs indicate whether the controller is in

RUN, STOP or OPEN condition. The controller operates in manual

or automatic reset mode.

Features

• 1 N.O. or 2 N.O. Safety Outputs

• 1 N.C. Auxiliary Output

• 24V AC/DC or 120/240V AC

• Output Monitoring

• LED Indicators for RUN, STOP and OPEN

• Automatic/Manual Reset

Specificationsþÿ þ þ Eþ ! þ" # ÿ $&%'ÿ #(*)! $ %+ÿ -,#./

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2-104



Product Selection

Approximate Dimensions—mm (inches)kKl m&n.o2p7l qo2p'r s n8o qtul o t n.o v nvCt qSw n8x p7n.v&y qsHl o p7t r z z r t l qoK/x s Hqp0np7|EE~Q. uE' k EE~E. ZEK EE~E. uEE k

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2-105


Typical W iring Diagrams

Accessories ! "# $% # & "')(*'+-,

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Safety E dges - RS Components · 2-90 Presence Sensing Safety Devices Safety E dges O verview...

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