IFM Electronic AC903S, AC904S Original Operating Instructions

7390915/03 01/2017

Original operating instructions

Safety switch with guard locking

AC903S AC904S

Contents

1 Preliminary note �� 4

1�1 Explanation of symbols ��4 2 Safety instructions ��4 3 Items supplied��5 4 Functions and features ��5 5 Structure and operating principle �� 6

5�1 Actuator version �� 7

5�2 Version AC903S (guard locking by spring force) ��7

5�3 Version AC904S (guard locking by solenoid force) ��7

5�4 Mechanical release ��9 6 Installation��9

6�1 Installation instructions ��9

6�1�1 Changing the actuating direction �� 10

6�2 Protection against environmental influences ��10 7 Electrical connection �� 11

7�1 Wiring�� 11 8 Set-up �� 11

8�1 Setting of the AS-Interface address �� 11

8�2 Configuration in the AS-Interface safety monitor �� 11

8�2�1 Monitor with extended functions ��12

9 Operation �� 13

9�1 LED indicators / AS-Interface status messages ��13 10 Function check and troubleshooting �� 14

10�1 Mechanical function check ��14

10�2 Electrical function check ��14

10�3 Troubleshooting ��14 11 Scale drawing ��16 12 Technical data �� 17 13 Terms and abbreviations ��18 14 Data bit table��19

15 Standards and approvals �� 22

15�1 Directives and standards ��22

15�2 Approvals �� 22

1 Preliminary note

Technical data, approvals, accessories and further information at www�ifm�com�

1.1 Explanation of symbols

► Instructions > Reaction, result → Cross-reference

Important note Non-compliance may result in malfunction or interference�

Information Supplementary note�

WARNING

Warning of serious personal injury� Death or serious irreversible injuries may result�

2 Safety instructions

• Follow the operating instructions�

• Improper use may result in malfunctions of the unit� This can lead to personal

injury and/or damage to property during operation of the machine� For this reason note all remarks on installation and handling given in this document� Also adhere to the safety instructions for the operation of the whole installation�

• In case of non-observance of notes or standards, especially when tampering

with and/or modifying the unit, any liability and warranty is excluded�

• The unit must be installed, connected and put into operation by a qualified

electrician trained in safety technology�

• The applicable technical standards for the corresponding application must be

complied with�

• For installation the requirements according to EN 60204-1 must be observed�

• In case of malfunction of the unit please contact the manufacturer� Tampering

with the unit is not allowed�

• Disconnect the unit externally before handling it� Also disconnect any

independently supplied relay load circuits�

• After installation of the system perform a complete function check�

• Only use the unit under the specified operating conditions (→ 12 Technical

data)� In case of special operating conditions please contact the manufacturer�

• Use only as described below (→ 4).

• Safety switches fulfil a personal protection function� Incorrect installation or

tampering can lead to serious injury�

• Safety components must not be bypassed (bridging of contacts), turned away,

removed or otherwise rendered ineffective�

• On this point, take particular note of the measures to reduce the possibilities of

bypassing in EN ISO 14119: 2013�

• The switching operation must only be triggered by actuators specially provided

for this purpose which are permanently connected to the safety guard�

• A complete safety-related system normally consists of several signalling

devices, sensors, evaluation units and concepts for a safe shut-down� The manufacturer of a machine or installation is responsible for a correct and safe overall function�

• All safety instructions and specifications in the operating instructions of the

AS-Interface safety monitor must be adhered to�

3 Items supplied

• 1 AS-Interface safety switch type AC90xS

• 1 operating instructions safety switch with guard locking, ident no� 7390915� If one of the above-mentioned components is missing or damaged, please contact

one of the ifm branch offices�

4 Functions and features

AS-Interface safety switches type AC903S/AC904S operate as slaves on the safety bus AS-Interface Safety at Work and function as electromagnetic interlock devices with guard locking� The actuator has a low coding level�

In combination with a guard and the machine control system this safety component prevents the safety guard from being opened while there is potential of

exposure to a mechanical hazard�

For the control system this means the following:

- Switch-on commands which cause hazardous situations must become active only when the safety guard is in a protective position and the guard locking in locked position�

- The locked position of the guard locking must be released only when the hazardous situation is no longer present�

Before safety switches are used, a risk assessment must be performed on the machine, e�g� according to

- EN ISO 13849, Safety of machinery - Safety-related parts of control systems

- EN 12100-1, Safety of machinery - General principles for design - Risk assessment and risk reduction

Correct use includes compliance with the relevant requirements for installation and operation, in particular

- IEC 62061, Safety of machinery - Functional safety of safety-related electrical, electronic and programmable electronic control systems

- EN ISO 13849, Safety of machinery - Safety-related parts of control systems

- EN 14119, Interlocking devices associated with guards

- EN 60204-1, Electrical equipment of machines

The user is responsible for a safe integration of the device into a safe overall system�

► Validate the whole system, e�g� to EN ISO 13849-2�

If the simplified procedure to EN ISO 13849-1:2016 (section 6�3) is used for validation, the performance level (PL) may be reduced in the event of several units being connected in series� If a data sheet is supplied with the product, the specifications of the data sheet apply in case of deviations from the operating instructions�

5 Structure and operating principle

AS-Interface safety switches, type AC903S/AC904S feature a slave interface to the safety bus AS-Interface Safety at Work� They enable locking of movable safety guards�

There is a rotatable camshaft in the head of the switch that is blocked/released via the locking bolt� When the actuator is inserted/removed or when the guard locking is activated/released the locking bolt is moved� The switching contacts are activated�

When the camshaft is blocked (guard locking active) the actuator cannot be drawn out of the switch head� For reasons of design, the guard locking can only be activated if the protective equipment is closed (protected against incorrect locking)�

Position monitoring of the safety guard and monitoring of interlocking are performed via two separate contact elements (door monitoring contact SK and solenoid monitoring contact ÜK)�

When the safety guard is closed and the guard locking is active, each AS-i safety switch transmits a switch-specific unique safety code sequence comprising 8x4 bits via the AS-Interface bus� This code sequence is evaluated by an AS-Interface safety monitor� The positively driven contact SK for door monitoring is represented by the AS-Interface input bits D0 and D1� The solenoid monitoring contact ÜK is represented by the AS-Interface input bits D2 and D3�

► Configure the safety switch in the AS-Interface safety monitor accordingly (refer

to the operating instructions of the AS-Interface safety monitor and the data bit table)�

5.1 Actuator version

Actuator S for the AS-i safety switches AC903S/AC904S without insertion funnel�

5.2 Version AC903S (guard locking by spring force)

The locking bolt is held in locked position by spring force and is electromagnetically released� The spring-interlocked guard locking operates normally closed� In the event of interruption of the solenoid power supply the safety guard cannot be opened immediately�

For process protection the interlocking solenoid can be switched by software via the AS-Interface output bit D0�

+ 16 hidden pages

IFM Electronic AC903S, AC904S Original Operating Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual