IFM Electronic GM705S Original Operating Instructions

Original operating instructions

Fail-safe inductive sensor

GM705S

704241 / 03 04 / 2010

1 Preliminary note ��3

1�1 Explanation of symbols ��3

2 Safety instructions ��4

2�1 Safety-related requirements regarding the application ��4 3 Items supplied��5 4 Functions and features ��5 5 Function ��6

5�1 Enable zone ��6

5�2 Protection against simple defeating ��7 6 Installation��8

6�1 Alignment of the sensing face ��8

6�2 Installation conditions ��8 7 Electrical connection ��9 8 Set-up ��10

8�1 Activate adjustment mode ��10

8�2 Determine the enable zone ��10

8�3 End adjustment mode �� 11 9 Operation ��12

9�1 Switching state of the outputs ��12

9�1�1 The safe state ��12 9�1�2 The switched state ��12 9�1�3 Output characteristics ��12 9�1�4 Cross faults ��12

9�2 Operating mode ��13

9�2�1 Delayed switching of the LED ��13

9�2�2 Switching of the LED without delay ��14 9�3 Response times ��14 9�4 LED display ��15

10 Scale drawing ��16 11 Technical data ��16 12 Troubleshooting ��19

13 Maintenance, repair and disposal ��19 14 Approvals / standards ��20 15 Terms and abbreviations ��21

1 Preliminary note

The instructions are part of the unit� They are intended for authorised persons according to the EMC and Low Voltage Directive and safety regulations� The instructions contain information about the correct handling of the product� Read the instructions before use to familiarise yourself with operating conditions, installation and operation� Adhere to the safety instructions�

1.1 Explanation of symbols

►

Request for action

LED on

LED off

LED flashes

LED flashes quickly

Important note

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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 these instructions� Also adhere to the safety instructions for the operation of the whole installation�

• In case of non-observance of notes or standards, specially 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 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 setup the system has to be subjected to a complete function check�

• Use the unit only in specified environmental conditions (→ 11 Technical data)� In case of special operating conditions please contact the manufacturer�

• Use only as described below (→ 4 Functions and features)�

2.1 Safety-related requirements regarding the application

It must be ensured that the safety requirements of the respective application correspond to the requirements stated in these instructions�

Observe the following requirements:

► Take measures to avoid metallic objects being placed on the sensing face

intentionally or unintentionally�

► Adhere to EN 1088 for interlocking devices associated with guards� ► Adhere to the specified operating conditions (→ 11 Technical data)� Use of

the sensor in the vicinity of chemical and biological media as well as ionising radiation is not permitted�

► Adhere to the principle of normally closed operation for all external safety

circuits connected to the system�

► In case of faults within the fail-safe sensor which result in the defined safe

state: take measures to maintain the safe state when the complete control system continues to be operated�

► Replace damaged units�

3 Items supplied

1 fail-safe sensor GM705S with premounted angle bracket, 1 Allen key for fixing the fail-safe sensor onto the angle bracket, 1 operating instructions GM705S, ident number 704241�

If one of the above-mentioned components is missing or damaged, please contact one of the ifm branch offices�

4 Functions and features

The fail-safe inductive sensor GM705S detects metal without contact� Safety function SF: The safe state (output stage switched off; logic "0") is achieved

when undamping greater than or equal to the safe switch-off distance sar (→ 11 Technical data)� Also observe the notes on installation of the sensor (→ 6 Installation)�

The fail-safe sensor conforms to the category 4 according to EN 954-1 (valid until 31 December 2011), Performance Level e according to EN ISO 13849-1:2008 as well as to the requirements SIL 3 to IEC 61508 and meets SILcl 3 to IEC 62061�

The unit corresponds to the classification I2C40SP2 to IEC 60947-5-2 for nonflush installation (→ 6 Installation)�

The fail-safe inductive sensor has been certified by TÜVNord�

5 Function

fail-safe sensor



2x LED: Signal (yellow); power (green)



close range



enable zone



safe switch-off distance s

 

target

5.1 Enable zone

The outputs (OSSD) are only enabled when a damping target is present in the enable zone� Outside this enable zone the outputs remain switched off�

If damped with a standard target plate of 60 x 60 x 1 mm made of FE360 (= mild steel) and non-flush installation to IEC 60947-5-2, the enable zone is in the range of ≤ 4 �� ≥ 20 mm�

The safe switch-off distance sar is > 45 mm� The enable zone is different if damping elements which deviate from the standard

target plate in terms of material, form and size are used� Enable zone for other materials*:

Material Enable zone

stainless steel 2�0��17�6 [mm] AIMg3G22 0��9�6 [mm] AI 99 % 0��8�6 [mm] CuZn37 0��10�0 [mm] copper 0��7�0 [mm]

* Typical values for damping with a reference target of 60 x 60 x 1 mm and non-flush installation to IEC 60947-5-2 at an ambient temperature of 20°C�

5.2 Protection against simple defeating

The fail-safe sensor reacts to metal objects, e�g� the frame of a security door� Other metal objects that are not intended to enable the sensor must not be allowed to enable the fail-safe sensor, either intentionally or unintentionally�



► Take measures to prevent metal objects, except the designated target,

from being placed on the sensing face or in the enable zone intentionally or unintentionally�

In addition, the sensor has the following switching characteristics to make simple defeating of its safety function more difficult:

1� By slowly introducing a metallic object into the enable zone, the outputs are

immediately switched, but displayed by the LED with a delay of approx� 3 s (→ 9�2�1 Delayed switching of the LED)� By doing so, the object is generally in the close range before the LED indication is lit� The technical instructions concerning the restart of the installation must be observed�

2� If the metal object remains in the close zone for over approx� 2 s, the outputs

are completely disabled and no longer enabled in case of damping in the enable zone� If the object stays in the close range for longer than approx� 5 s,

the adjustment mode is activated (→ 8�1 Activate adjustment mode)� Release of the enable zone can be carried out

• by undamping (> 45 mm) for over 2 s

• or by power off (→ 8�3 End adjustment mode)�

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