INSTALLATION MANUAL

FCU47 SAFESCREEN

FCU47 SAFESCREEN

• Comprehensive Range

• Field-friendly Installation

• Fail-safe Operation

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Page1. Introduction 22. How it works - FCU47 33. Controller-less connection 4

3.1 Power requirement 53.2 Earth / ground conditions 53.3 Signal output 53.4 Connection to existing Formula 5

Systems control boxes4. Universal Interface 6

4.1 Operation 64.2 Overload protection 64.3 Indicator LEDs 64.4 Options 6

5. Installation - FCU47 75.1 Installation 75.2 Mounting the edges 75.3 Cord routing 75.4 Switch selection 85.5 Indicator LEDs 8

6. Installation - Universal interface 96.1 Installation - FPS 0270 and FPS 0271 96.2 Additional features - FPS 0271 96.3 Time out relay option - FPS 0271 96.4 Detect relay option - FPS 0271 10

7. Packing list 117.1 Product identification 117.2 Standard system with universal interface 117.3 Long range system with universal interface 117.4 Standard system for controller-less connections 117.5 Long range system for controller-less connections 11

8. Product specification 128.1 FCU47 128.2 Universal Interface 14

9. Trouble-shooting guide 159.1 Problem checklist 15

10. Accessories 1711. Contact Details 18

LEAF0065 ISS04 17-SEP-01

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The FCU47 is an infrared light curtain sensor system for detectingobstructions between elevator doors.

The system contains 47 protective beams spaced evenly as shown onpage 13.

The standard product is suitable for door heights between 6’6”(1981mm) and 7’ (2136mm).

The system consists of two parts - a Transmitter (Tx), and Receiver(Rx) edge. These edges contain all the intelligence required to controland synchronize the transmission and reception of all the protectionbeams and provide an output that indicates the obstruction status ofthe detector system.

The system has been designed to integrate efficiently into modernelevator systems.

In certain circumstances it can be connected directly to either thedoor operator or to the elevator control, in a similar fashion to thatof a through beam photo-eye.

The electrical interface required to connect the system in this way isdetailed in the section - Controller-less connection (page 4).

In certain circumstances, especially when modernizing existingelevators, controller-less connection may not be possible. In thisinstance an optional universal interface is available, allowingconnection to all elevators. The universal interface is powered bymains voltage and provides connection to the elevator control via adual pole relay with both normally open and normally closedcontacts.

This universal method of connection is detailed in the section - Universal interface (page 6).

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1. Introduction

Thank you for purchasing a Formula Systems elevator door protectionproduct.

If you are familiar with our products and have used them in the past,you will be aware of the high levels of quality and service we provideas one of the largest global manufacturers of elevator door protectiondevices. The latest product range offers significant improvements.They have been designed to simplify installation and increasereliability in the harshest of environments.

If you have not used our products before, 'WELCOME!' We areconfident that you will enjoy the benefit of our many yearsexperience gained in elevator markets across the globe. Our productsare intended to be simple, fit for purpose and to fully satisfy therequirements of you, your customers and their elevator passengers.

Formula Systems products are available in a variety of configurationssuitable for both new and existing installations. In addition to ourcurrent range, we will happily work with you to create a solution thatis custom-made to your requirements.

No-one understands elevator door protection systems better thanFormula Systems. Having established a reputation for innovativedesign, technical excellence and unsurpassed reliability, our positionas a market leader remains unchallenged.

All Formula Systems products are backed by the degree of serviceassociated with a world leader, supported by a world wide network ofagents offering a full after-sales service.

If you would like to know more about the best known name inelevator products talk to us at Formula Systems now.

IMPORTANT NOTICE

When the Formula Systems FCU47 is used as a replacement for mechanical safetyedges, it is the responsibility of the installer to ensure that on completion, theinstallation complies and conforms with all the relevant state codes, local codesand regulations that apply to infra-red and photoelectric door protection devices.

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3.1 Power requirement

The edges require a 15V to 30V DC supply, capable of providing therequired current - 100mA (Class II supply).

3.2 Earth / ground conditions

The 0V used by the FCU47 is connected by default via the housing toground (see diagram opposite). These connection conditions shouldbe compatible with the 24V DC supply available.

3.3 Signal output

The output from the edge is an open collector NPN transistor. It hastwo states: during unobstructed operation, it will switch the outputsignal line to ground; when obstructed, the line will be released andallowed to float.

The output transistor is rated at 50V 50mA. It is usual for this line tobe connected to a logic input with a pull-up on the door operator, butcan be connected to the coil of a relay if a free contact is required.In this instance, a fly-back diode will be required across the relay coilto clamp the inductive energy released when the relay is de-energised.

If in doubt, do not connect the FCU47 but seek further clarification.Refer to section - Contact details.

3.4 Connection to existing Formula Systems control boxes

All early versions of Formula Systems FPS control boxes provide asuitable dc supply for controller-less edges from their ‘+’ (24V), and‘C’ terminals.

These units also have a test link terminal which can be used directlyby the open collector output from the controller-less edges to providea universal interface to all elevator systems.

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3.Controller-less Connection

The FCU47 is designed to be connected from the door operator orcontroller auxiliary 24V DC supply, usually provided to power singlephoto eyes. The supply should be class II or protected againstoverload.

The output is an NPN open collector and is intended to be directlyconnectable to the door operator or controller. The local 24V supplymust be able to have the negative pole connected directly to the carchassis.

TRANSMITTERBLACK #1 (center core)

(NOT USED)

RECEIVERBLACK #1 (center core)

O/P

BLACK #2(outer core)

(+24V)

GRN/YEL(0V)

GRN/YEL(0V)

RECEIVER CONNECTION DIAGRAM

+24V (BLACK #2 outer core)0/P (BLACK #1 center core)0V (GRN/YEL)

BLACK #2(outer core)

(+24V)

Cross Reference (earlier version products):BLACK #1 (center core) = BROWN = O/PBLACK #2 (outer core) = BLUE = +24VGRN/YEL = GRN/YEL = 0V

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5.1 Installation

All versions of the FCU47 can be mounted to the elevator in the sameway. For centre opening applications, both units should be mountedon the landing side of the leading edge of the car door.

For side-opening applications, one of the edges will be mounted onthe door (as with centre opening), the other fixed to the strike jambopposite.

5.2 Mounting the edges

5.3 Cord routing

It is important that the cord is routed with sufficient free cord toavoid sharp bends or flexing. Ensure there is no risk of catching orrubbing by restraining the cord (using the nylon clamps and restraintsprovided in the parts kit). Generous bend radii should be maintainedin the hanging loop, to avoid damage to the cord as it bends duringoperation.

7

Remove existing door protection or site guard.For centre-opening applications, attach angle brackets to theedges using the bolts provided. For side-opening applications, attach one bracket to the edgeintended for the car door.Remove the filter cover from the edge to be mounted to thestrike jamb to allow access to the mounting holes.To ensure adequate running clearance between the bottom ofthe edge(s) and the door track, positioning spacers are includedin the parts kit. Stand the edge(s) on top of the spacer(s), their back(s) againstthe door(s) and/or slam, parallel to and a minimum of 1/8”(3mm) back from the leading edge of the door(s).Use the holes as a template to mark the location of the five (5)mounting hole positions.Centre punch and drill the holes marked and secure the edgesinto place using five (5) M4 x 20mm thread forming screwsprovided.

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4. Universal Interface

4.1 Operation

The universal interface is designed to allow the latest generations oflight curtains to be interfaced with any elevator control system. Theinterface can be powered by either 115V or 230V AC depending onthe position of the voltage selection switch.

Two sets of change-over relay contacts are provided to connect theoutput of the interface unit to the elevator control.

To provide a fail safe response to power failure, the relay is normallyin the energized state, and will drop out when any of the light beamsare interrupted.

The ‘N/O’ (normally open), and ‘N/C’ (normally closed) terminalmarkings on the printed circuit indicate the contact state whenenergized.

4.2 Overload protection

The output of the universal interface is protected against shortcircuits by a Polyswitch current sensor. This will isolate the outputunder fault conditions.

Once tripped the system can be reset by switching the ACsupply off for approximately ten seconds.

4.3 Indicator LEDs

The green LED indicates that power is present.

The red LED illuminates when the system has identified anobstruction and the relay has dropped out.

4.4 Options

The universal interface is available in two forms, FPS 0270 basic unitand FPS 0271 equipped with the addition of a buzzer andtimeout/nudging features

NOTE:

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NOTE:

6.1 Installation - FPS 0270 and FPS 0271

The universal interface box can be mounted to the elevator car by meansof the external mounting holes and screws.

Connect the electrical supply and relay output contacts to the elevatorsystem according to local code requirements.

Ensure the correct supply voltage is selected (115V or 230V), BEFOREswitching on the supply.

Switch on the supply, check that both the red and green LEDs are on.

Connect the transmitter (Tx) and receiver (Rx) edges to either of thelight curtain outputs provided on the universal interface.

With the light curtain uninterrupted the red LED should be off and therelay should be energized.

With the beams interrupted the red LED should illuminate and the relaydrop out.

6.2 Additional Features - FPS 0271

BuzzerThe buzzer can be controlled in one of two ways:

Switch 1 'on', the buzzer will sound after a delay set by the system timeout.Switch 2 'on', the buzzer will sound immediately the system detects anobstruction.

If switch 1 & 2 are 'on' at the same time, switch 2 will override switch 1

6.3 Time out Relay Option - FPS 0271

The time out relay will change state after an obstruction has beenpresent longer than the time out period set. The time out period can be

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5. Installation - FCU47 (cont.)

5.4 Switch selection

A selection switch is provided to control software options. Switchconfiguration is as follows:

Position 1(ON) = Enables single blocked sensor override Position 2 = Reserved

5.5 Indicator LEDs

Both the transmitter and receiver have a green LED to indicate thatpower is present.

In addition, the receiver (Rx) edge has a red LED to indicate that notall 47 beams are recognized as being present, or a beam is blockeddue to an obstruction.

15.95” (405mm)

11.80” (300mm)

1’11” (600mm)

1’11” (600mm)

6.06” (155mm)

3/8” (10mm)

7’(2

136m

m)

Mounting Hole Positions

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7.1 Product identification

Ensure there is no shipping damage.

Please verify that you have received the correct product(s) specific toyour application from the list below:

7.2 Standard system with universal interface:

FDS 0547**01 SAFESCREEN STD + UI 270FCU 0547RX - SAFESCREEN RECEIVER - 1 offFCU 0547TX - SAFESCREEN TRANSMITTER - 1 offFPS 0270 - INTERFACE CONTROL UNIT - 1 off

- INSTALLATION KIT* - 1 off

7.3 Long range system with universal interface:

FDS 0547**02 SAFESCREEN L/R + UI 270FCU 0547RXLR - SAFESCREEN RECEIVER L/R - 1 offFCU 0547TXLR - SAFESCREEN TRANSMITTER L/R - 1 offFPS 0270 - INTERFACE CONTROL UNIT - 1 off

- INSTALLATION KIT* - 1 off

7.4 Standard system for controller-less connections:

FCU 0547**01 SAFESCREEN COL STDFCU 0547RX - SAFESCREEN RECEIVER - 1 offFCU 0547TX - SAFESCREEN TRANSMITTER - 1 off

- INSTALLATION KIT* - 1 off

7.5 Long range system for controller-less connections:

FCU 0547**02 SAFESCREEN COL L/RFCU 0547RXLR - SAFESCREEN RECEIVER L/R - 1 offFCU 0547TXLR - SAFESCREEN TRANSMITTER L/R - 1 off

- INSTALLATION KIT* - 1 off

* For the contents of the installation kit, refer to section 8.1.** Customer specific.

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6. Installation - Universal Interface (cont.)

adjusted (by potentiometer on the PCB) between approx. 10 and 45seconds, clockwise adjustment increases the time out. Thepotentiometer is marked 'time out', although possible to adjust byhand, it is recommended that a suitable screwdriver be used.

6.4 Detect Relay Option - FPS 0271 (Switch 3)

The detection relay can be configured to function in two ways:

‘OFF’: Detection relay remains in detection after time out and resetson obstruction removal.

‘ON’: Detection relay returns to non-detect during time out periodand resets after delay on obstruction removal.

N/OCOMN/CN/OCOMN/C

DETECTRELAY

RELAY LED POWER LED

FPS 0271 UNIT

+ O/P

C + O/P

C

TRANSFORMER

VO

LTA

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SE

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TIO

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SUPPLY

EARTH/GRD

LIGHT CURTAIN(Interchangeable)

*TO THE CONTROLLER(VOLTAGE FREE CHANGE

OVER CONTACTS)

SUPPLYUNIT

N/OCOMN/CN/OCOMN/C

RELAY

RELAY POWER

FPS 0270 UNIT

+ O/P

C + O/P

C

TRANSFORMERV

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230VSUPPLY

EARTH/GRD

LIGHT CURTAIN(Interchangeable)

*TO THE CONTROLLER(VOLTAGE FREE CHANGE

OVER CONTACTS)

SUPPLYUNIT

TIME OUTRELAY

TIME OUTADJUSTER

(RED) (GRN)

1 2 3

1=BUZZER ON TIMEOUT2=BUZZER ON DETECTOR3=DETECTION RELAY OPTION

*Controller Relay:state shown when system is energised, operational and with no obstruction. NOT IN THE UN-ENERGISED RELAY STATE.

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T1T2T3T4

R1R2R3R4

R23R24

T23T24

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

1” (26mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.95” (75mm)

2.5” (63mm)

Pin

ch p

oint

= 1

.48”

(37.

5mm

)

Beam Pattern

5’10

” (17

88m

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8. Product Specification

ItemNumber of BeamsNumber of SensorsSensor SpacingDistance between beams atpinch point (doors closed)Scan TypeResponse Time

Range of detection

Light ImmunityAngular DisplacementPosition Mounting Tolerance

Operating VoltageCurrent ConsumptionControl Unit

Environmental ProtectionOperating Temp. RangeStorage Temperature RangeUnit SizeMountingIndicators

Cable Supplied

Case MaterialCover (filter)Installation Kit

System Approvals

Detail47 non-focused beams242.95” (75mm)1.48” (37.5mm)

Interleaved10 to 100 milliseconds

6’ Door mounted (1800mm)16’ Door mounted (5000mm)50 000 lux10°+/- 0.7” (18mm) vertically+/- 0.2” (5mm) side by side24 volts<100 mA RMSNot required

0°C to +70°C-40°C to +80°C1.18”x0.8”x7’ (30x20x2136mm)Five screw positionsSupply present:System fault/beam obstructed:Two x 13’ (4m) approx of 3 core cableAluminium alloyInfra-red transparent plasticInstructions - 1 offSpacer Block - 1 offCable Clips - 6 offNytie - 8 offScrews M4.0 x 20mm -24 offWashers -24 offShk. Prf. Washers M4.0 -24 offMounting Brackets - 2 offScrews M5.0 x 10mm -10 offWashers M5.0 -10 offShk. Prf. Washers M5.0 -10 offSelf adhesive pads - 4 offCable retainer - 2 offScrewdriver - 1 offDrill Bit - 1 offUL, cUL, CE (EMC)

Additional commentsInfra-redSee beam drawingSee beam drawingSee beam drawing

Relates to point of detection in scan cycleStandard productLong range productVisible light

Doors closed, units touching16 volts min 30 volts maxTotal of both unitsOptional Interface (FPS 0270 or FPS 0271)Conformal coating to PCB’s

See mounting drawingGreen LEDRed LEDConnects to product via short fixed leadFinished BlackSnap-on fixing

VariousThread formingLarge diameter

Use with Mounting BracketUse with Mounting BracketUse with Mounting BracketOptionalOptionalOptionalOptionalEN12015, EN12016

8.1 FCU47

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If the above table does not resolve your installation issues, follow thesteps below to check each part of the system and the interface to theelevator control:

Check that power is present on both Rx and Tx edges. A small greenLED at the top of each edge indicates power is present.

Confirm the voltage between the positive and common supply input(nominally 24V) is between 16 and 30 volts DC.

If the universal interface is being used, confirm the mains voltageselection switch is set for the voltage being used.

Confirm that the red LED is normally ‘off’ but will come on when anybeam is obstructed. The Rx edge has a red LED next to the greenLED which is normally off, but which will illuminate under any of thefollowing conditions:

DETECTOR WIRES CROSSED • WRONG MAINS CONNECTIONS IN P.S.U. • •LOW VOLTAGE TO DETECTOR •DOOR STOPPING DISTANCE TOO LONG •DUST ON FILTER •LOOSE DETECTOR CONNECTIONS • • • • •INTERMITTENT CABLE SHORT OR BREAK • • • • •ELECTRICAL NOISE IN LINE • • •GROUND PROBLEM • • • •WRONG DETECTOR INSTALLED • • •ELECTRICAL SHORT IN DETECTOR CABLE • •INCORRECT WIRING TO CONTROLLER • •

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LOSE

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TO C

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9.1 Problem Check List

The check list will help toidentify most of the problemsand their causes.

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8. Product Specification (cont.)

8.2 Universal Interface

ItemSupply VoltageSignal Output

Fail Safe ConditionsCompatibility

EnclosureOperating Temp. RangeStorage Temperature RangeUnit sizeMountingIndicators

System Approvals

FPS 0270 specific:Power consumption

FPS 0271 specific:Power consumptionFunction Switch (SW2):

Position 1Position 2Position 3

Detail230 or 115V AC (50Hz or 60Hz)Volt free change-over relaycontactsFaulty cable or Supply FailureFCU 0500 & 0700 Series,FZU 1000 SeriesCoated Steel0ºC to +70ºC-40ºC to +80ºC2”x2”x12” (54x54x300mm)Four screw positionsSupply present:System fault/beams obstructed:UL, cUL, CE (EMC)

3.5VA (Typical)

4.0VA (Typical)

Buzzer on time-outBuzzer on detectionDetection relay options

Additional commentsSwitch selected (SW1)Contacts rated / set, 240VAC 4A RES.

Nominal DimensionsSee drawing belowGreen LEDRed LEDEN12015, EN12016

Enabled when sw to ‘ON’Enabled when sw to ‘ON’See section 6.4

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9. Trouble Shooting (cont.)

• Any one of the beams are blocked. • The system is outside of its range/angular specification • The lens is dusty or dirty. • Either the Rx or Tx edge is damaged or faulty.

The signal output will be 'High' in the beam-blocked state (red LED on)and 'Low' to indicate no obstruction (red LED off). When high the signalvoltage will normally be 'pulled up' to the same voltage as the lowvoltage DC supply, but because of the nature of the open collectoroutput, may be any voltage that represents the logic high state of thelogic circuits within the elevator control system.

Ground is used as the reference voltage for 'logic low', and the signaloutput should be no more than 0.6 volts higher than ground in the logiclow state, if it is ensure the load it is switching is not higher than 50mA.

Determine that the signal output toggles between these two voltageswhen the beams are interrupted.

If the door operation is not working properly and it is unclear whetherthis is being caused by the signal output or the response of the elevatorcontrol, the input into the control system can be checked without the Rxedge connected.

The signal input can be connected to ground to force a permanent nondetect state allowing the door(s) to close. Removing this connection andallowing the signal input to 'float' should force the system into a statethat holds the door(s) permanently open.

The elevator must not be put back into service with the signalinput permanently connected to ground.

If after having read and followed this, you are still unsure of the causeof the problem, please contact us in any of the ways shown at the endof this manual.

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11. Contact Details

Address: FORMULA SYSTEMSTechnology HouseOakfield EstateEynshamOxfordOX29 4AQUK

Telephone: +44 (0)1865 882442

Facsimile: +44 (0)1865 881647

E-mail: sales@airdri.com

Website: www.formula-systems.com

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FORMULA SYSTEMSTechnology House, Oakfield Estate, Eynsham, Oxford, OX8 1TH, UK

Telephone: +44 (0)1865 882442 Fax: +44 (0)1865 881647www.formula-systems.com

© Copyright Formula Systems 2000

1/8” (3 mm)

3/8”(10mm)Spacer

15

FCU SAFESCREEN SYSTEM INSTALLATION47

Side Opening

2

5

4

75

5

5

8

9

10

11

12

5

5

5

514

13

Option

10

11

12

2

14

13

19

Option

2 2

2

1

4

10

11

12

5

5

5

13

3 10 11 124

134 4

LEAF0241 Iss 01 20-FEB-08

Center Opening

10

11

12

14

13

19

Option

10

11

12

2

14

13

19

Option

2

2

2

22

2

2

2

5

4

710

8

9

10

11

12

14

13

Option

1

2

2

10

10

10

10 10

10

3 10 11 124

134 4

PACKING LIST FDS 0547Product:

1 - Safescreen Receiver2 - Safescreen Transmitter3 - Interface Unit (See Reverse)4 - Cable Assembly5 - Mounting Bracket6 - Installation Guide

Accessories:7 - M5 x 10mm Screw (standard)8 - M5 Washer Plain9 - M5 Washer Shakeproof

10 - M4 x 20mm Screw (thread forming)11 - M4 Washer Plain (large diameter)12 - M4 Washer Shakeproof13 - Drill Bit 3.6mm14 - #10 x 13mm Screw (self drill)15 - Spacer Block16 - Cable Clips17 - Nytie18 - Self adhesive pads19 - Cable retainer

x 1x 1x 1x 2x 2x 1

x 10x 10x 10x 24x 24x 24x 1x 14x 1x 6x 8x 4x 2

10

11

12

2

2

213

16

}}

1/8” (3 mm)

FCU SAFESCREEN SYSTEM INSTALLATION47

INTERFACE UNIT

Indicator Status Action

Green On - Supply OKOff - No Supply Check AC (DC) Supply

Red Off - No Obstruction (relay energised)On – Obstruction (beam broken) Remove obstruction

SAFESCREEN TRANSMITTER

Indicator Status Action

Green On - Supply OKOff - No Supply Check AC (DC) Supply

& Cables for damage

SAFESCREEN RECEIVER

Indicator Status Action

Green On - Supply OKOff - No Supply Check AC (DC) Supply

& Cables for damage

Red Off - No ObstructionOn - Obstruction (beam broken)Flash - Single Beam Override Active

Remove obstruction

FINAL CHECK & TROUBLESHOOTING

7 7

/8”

(200 m

m)

1 3

/16”

(30 m

m)

Red(RX)

Green

INDICATOR LOCATIONS

UNIT TOP

Time OutAdjuster

SupplyInput

To the Controller(Voltage free change

over contacts)

1=Buzzer ON Time Out2=Buzzer ON Detect3=Detection Relay Option

Transformer

Vol

tage

Sel

ectio

n

115/230V

Supply

Earth/GRD

Light Curtain

+ O/P

C + O/P

C

N/OCOMN/CN/OCOMN/C

DetectRelay

Relay LED(RED)-

Power LED(GRN)-

1 2 3

INTERFACE UNIT - BUZZER / NUDGING FEATURES

+-

Transformer

Vol

tage

Sel

ectio

n

115/230V

Supply

Earth/GRD

Light Curtain

+ O/P

C + O/P

C

N/OCOMN/CN/OCOMN/C

DetectRelay

RelayLED

(RED)

PowerLED

(GRN)

INTERFACE UNIT - STANDARD FEATURES

INTERFACE UNIT - DETAILS

FIELD WIRING

Route cable through the holes provided adjacent to the point of connection.

0.45Nm

60°C> CuCable insulation to be rated 60°C mininum.Copper conductors must be used.

Nominal tightening torque value 0.45Nm

To the Controller(Voltage free change

over contacts)

SupplyInput

INTERFACE UNIT - ADDITIONAL INFORMATION

INTERFACE UNIT - BUZZER / NUDGING FEATURES

The buzzer/nudging power supply offers a variety of features to facilitate elevator doorcontrol set-up during continuous beam interruption.

As with our standard power supply a simple relay activates whenever beam paths areblocked.

In addition to the "standard" relay an additional relay will activate after beam pathshave been continuously blocked for a pre-determined period of time. This "time-outperiod" can be determined by the installer during set-up by way of a variablepotentiometer mounted on the power supply circuit board.

As elevator controllers have become more intelligent over time, Formula haveincluded a relay configuration option that may be invoked through "Switch #3".

For older elevator systems, door speed/power are typically a door-operator controlledfunction. The door controller simply controls the instructions to open or close doors.Therefore, if a constant obstruction is detected, the "standard" relay will activate asnormal, and remains activated until the "time-out" relay switches.

On older elevators, the "time-out" relay would switch in a resistor to effectively reducethe motor power to slow-down the closing speed of the doors. However, with thebeam-path obstruction still present, the "standard" relay would still be activated,therefore the controller would still not know that the doors can now be instructed toclose.

Switch #3 resolves this conflict. If switch #3 is in the "on" position, as soon as the"time-out" relay activates, the "standard" relay immediately reverts to a "noobstruction" state, even though an obstacle remains. Therefore, the "time-out" relayswitches in the door speed resistor on the operator, and at the same time the doorcontroller sees an "all clear" from the "standard" relay, thereby allowing the doors tobe instructed to close.

Leaving switch #3 in the "off" position may be a requirement for more sophisticatedcontrollers that can invoke slow-speed closing from the "time-out" relay and can ignorethe "standard" relay signal.

In order to see this feature in operation, let a power supply time-out (this can be donebench-mounted without edges connected), and turn switch #3 on and off. This shouldactivate and de-activate the "standard" relay.

EVENT SEQUENCE - BUZZER / NUDGING OPERATION

Event

Standard Relay

(Switch 3 OFF)

Standard Relay

(Switch 3 ON)

Time-out Relay

No obstruction Dormant Dormant Dormant

Obstruction before time-out period Active Active Dormant

Obstruction after time-out peroid Active Dormant Active

Contacts:

Formula online: http://www.formula-systems.com

Customer Care: North America 1-866 952 9200 (toll free)Others Countries: +44 (0)1865 882442

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Time OutRelay