BERNSTEIN SCR OM Bedienungsanleitung

Muting controller

with Relay Outputs

SCR OM

Special characteristics:

- Intended for use with Bernstein light curtains

- Muting controller for presence sensing safeguarding devices according to EN 61496-1

- For applications up to safety category 4 according to EN 954

- Connection of an external muting light according to EN 61496-1

- Connection of different muting-sensors (NPN, PNP and relay outputs)

- Monitoring of external contactors and expansion modules

- Housing with detachable terminal strips

Art.-Nr.: 6562321009

Original: 01

Benennung: SCR OM 24VDC

Mittl.Nr.: 0089-07

Datum: 13.02.2007

WARNING

Bernstein safety systems are intended to protect operators

working at or near dangerous machinery. They can only

perform this function if they are correctly fitted to a suitable

machine. It is essential that the full contents of this manual

and all the authoritative documents referred to herein are

fully understood before any attempt at installation is made.

If in doubt contact your authorised Bernstein distributor.

The safety of persons and equipment cannot be guaranteed

if the muting controller is not used in accordance with its

intended use.

IMPORTANT

This manual must accompany the product throughout its

working life. Those persons responsible for the product must

ensure that all persons involved in the installation,

commissioning, operation, maintenance and servicing of the

product have access to all the information supplied by the

manufacturers of the machine and its safety system.

PLEASE OBSERVE THE FOLLOWING:

 The device may only be installed and commissioned in compliance with these operating instructions

by suitably qualified personnel familiar with working safety and accident prevention legislation.

Electrical work may only be performed by suitably qualified electricians.

 Repairs, in particular those involving opening the housing, may only be performed by the

manufacturer or persons authorised up by the manufacturer. Any attempt to perform repairs by

unauthorized persons will invalidate the warranty.

 Please observe the relevant valid regulations, in particular those pertaining to safety measures and

the installation of muting sensors, the muting lamp and the Bernstein light curtain.

 It must be possible to view the danger area from the installation location of the start button and the

key-operated switch.

 It must not be possible to start the equipment from the danger area.

Explanation of terms

Muting Temporary by passing of a Light Curtain in order to transport

material into or out of the danger area.

Restart inhibit Prevention of machinery from automatically resuming

operation.

Introduction

The Bernstein SCR OM muting controller with relay outputs is designed to be used with the new generation of

Bernstein safety light curtains, to safeguard operators from dangerous machinery up to safety category 4 as

described in EN 954-1. The integrated muting function, which has been designed to EN 61496, permits goods

to be transported into or out of the danger area without impairment to the safety function.

The SCR OM provides a safe method of providing a muting function, by the appropriate use of carefully

positioned sensors, either two or four, at the entrance / exit of the danger area, in such a way that only the

material being transported activates the sensors. Once the material has activated the muting sensors, the

SCR OM then initiates the muting cycle for the period during which the material is being transported through

the protected field.

The muting sensors are arranged in such a way as only the material can correctly activate the muting sensors,

and any person approaching the danger area will cause a shut down of the safety system.

A basic overview of the muting application is shown in the diagram below:

MS1

MS2 MS3

Danger area

MS4

EST ESS

MS1, MS2, MS3, MS4 Muting sensors ML Muting lamp

EST Start button ESS Key-operated switch

Operation

The SCR OM functions in the following way:

To initiate a muting cycle, muting sensors MS1 and MS2 have to be activated within 3 seconds of each other.

The muting lamp will turn on, and any interruption of the light curtain will not cause the outputs of the

SCR OM to de-activate. Once three of the four muting sensors have been cleared, the muting cycle will

terminate after a time period of 0.25 seconds, and the light curtain will no longer be bypassed.

Muting

a: active

b: inactive t<3s t<3s

0,25 s

MS4

MS3

MS2

MS1

Signal must be overlapping, i.e. both

muting sensors must be active at the same time

MS1

MS2 MS3

MS4 MS1

MS2 MS3

MS4

MS1

MS2 MS3

MS4 MS1

MS2 MS3

MS4 MS1

MS2 MS3

MS4

t1 t2 t3 t5

It is possible to use only two retro-reflected type mute sensors, if they are arranged diagonally across the field

of the light curtain, with the cross over point on the dangerous side of the light curtain, as shown below:

MS1 MS1

MS2 MS2MS3

MS4

Indicators

Five indicators on the front panel of the SCR OM are used to indicate the control units status.

1Power ON

2Fault

3 Restart inhibit on, waiting for start

4Operation – Channel 1 activated

5Operation – Channel 2 activated

4+5 flashing Error code (See Section XXX)

Connection Details

The following terminals are available on the SCR OM muting control unit

Terminals Description

A1+ , A2- Supply Voltage

EST+, EST Start/Restart button

ESS+, ESS Key-operated switch (Mute Over-ride)

ESS+, 53 Muting lamp

AML Not used for muting operation

ERK+, ERK Feedback circuit

MSx+ Positive voltage for muting sensor x

MSx- Negative voltage for muting sensor x

MSxP Input of muting sensor x -PNP

MSxN Input of muting sensor x -NPN

BWSE+ Positive voltage for light curtain signals

BWSE- Negative voltage for light curtain signals

BWSxP Input of light curtain channel x - PNP

BWSxN Input of light curtain channel x - NPN

13-14, 23-24, 33-34 Relay safety outputs

63-64 Light curtain enable output

54 Negative internal supply voltage (internally

connected to EST-, ESS-, ERK-, BWSE-, MSx-)

73-74 Auxiliary mute indicator output

OP, O1, O2 Optocoupler outputs

System Components

Muting lamp

During material transport through the protected field, the muting controller switches the muting lamp (ML) on.

The SCR OM monitors the filament of the muting lamp even when the muting function has not yet been initiated.

If the filament is defective, or if no lamp is connected, the control unit goes to lockout and the safety outputs are

switched off.

In accordance with EN 61496-1, the following conditions must be adhered to for the muting lamp.

The luminous surface must be at least 1cm² and have a brightness of at least 200cd/m².

Muting sensors

Mechanical, inductive, capacitative and optoelectronic sensors are suitable as muting sensors; either solid-state

outputs or relay outputs can be used.

1. The muting sensors must have a rated voltage of 24 V DC at the output.

Key-operated switch (Mute Over-ride)

A key operated switch is connected to the SCR OM to allow the user to manually activate of the mute cycle,

regardless of the status of the mute sensors, for example, when the material is already located in the area

monitored by the muting sensors, and the control unit outputs are de-activated.

The muting cycle remains active as long as the key-operated switch is actuated, for a maximum time of ten

minutes.

As soon as the muting sensors have been cleared, the key switch is released, and the system restarted with the

Start/Restart button

Outputs

The muting controller has the following outputs:

Three N/O safety relay outputs (13-14, 23-24, 33-34)

One N/O auxiliary mute lamp output (73-74)

Two auxiliary optocoupler outputs (OP-O1, OP-O2)

Optocoupler output O1 switches to 24V when the safety outputs are active.

Optocoupler output O2 switches to 24V when the connected light curtain is interrupted.

Mechanical Installation

Dust and moisture can lead to malfunctions. Install the device in a dust and damp-proof housing, for

example in a switch cabinet or a IP54 housing.

Mount the muting controller on a universal mounting rail DIN EN 50022 as shown below:

24 V DC

Electrical Installation

Important Information

Short circuits, broken cables, power failure or voltage fluctuations in the network can impair and/or cancel

the safety function and result in serious accidents.

 The safety output leads and, if they are the same polarity, also the leads of the two muting sensor

groups must be laid in separate non-metallic-sheathed cables.

 The power supply to the device and all connections must be reliably isolated from the mains, by using

an isolating transformer in accordance with IEC 60742 .

Muting sensors

Muting sensors are wired depending on the operating mode, type and number of sensors. Either 2 or 4 muting

sensors must be connected to the muting controller. When using two muting sensors, these must be connected

to terminals MS1... and MS2... .

Connect the muting sensors in accordance with the diagrams below:

MSxP and MSxN must always be connected on the SCR OM.

The unused connections on the SCR OM must be connected as follows:

If MSxN is not used, connect MSx- to MSxN

If MSxP is not used, connect MSx+ to MSxP

Please Note

1. If 4 muting sensors are connected, sensors with the same polarity must be used at the connections

MS1.. and MS4.. / at MS2.. and MS3.. .

2. The wiring for MS1../MS4.. and MS2../MS3.. must be in separate cables.

Light Curtain

The Bernstein Light curtain is to be connected to the SCR OM as shown below:

Power supply, Mute Over-ride key switch, Muting lamp, Start button

Connection of the supply voltage, mute over-ride, mute lamp and start button is as follows:

Only connect the operating voltage to terminals A1+ and A2- when the remaining wiring has been

completed.

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