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FWS 2105
FWS 2505

Operating instructions
Fail-safe standstill monitor

EN

2.5 

Safety classiication

Standards:

EN ISO 13849-1; IEC 61508

PL:

up to d

Control category:

up to 3

PFH value:

1.0 x 10

-7

 / h; applicable for 

applications with up to max.  

50,000 switching cycles / year and 

max. 80 % contact load. Diverging 

 

applications upon request.

SIL:

up to 2

Service life:

20 years

3  Mounting

3.1  General mounting instructions

Mounting: snaps onto standard DIN rails to EN 60715.

3.2  Dimensions

Device dimensions (H/W/D): 100 x 45 x 121 mm

4  Electrical connection

4.1  General information for electrical connection

The electrical connection may only be carried out by  
authorised personnel in a de-energised condition.

Wiring examples: see appendix

5  Operating principle and settings

Operating principle after the operating voltage is switched on

After the operating voltage has been applied, the internal functions and 

the condition of the safety relays will be tested by the fail-safe standstill 

monitor during the initialization phase. After this check, the inputs of the 

fail-safe standstill monitor will be evaluated.

The cyclic frequency of the connected proximity switches is compared 

to a programmed limit frequency. If the value drops below the pro

-

grammed frequency and at least one proximity switch is actuated, 

 

both safety relays are actuated and the enabling paths are closed.  

If the limit frequency is exceeded at one or both cyclic inputs or if both 

proximity switches are not actuated, the safety relays are disabled. 

 

If the programmed upper or lower limit frequency is exceeded, the 

frequencies of both proximity switches are compared. A divergence of 

over 30% will be considered faulty and signalled (refer to ISD table).

Inputs

X1: connection for proximity switch 1 (24 VDC)

X2: connection for proximity switch 1 (cyclic input)

X3: connection for proximity switch 2 (24 VDC)

X4:  connection for proximity switch 2 (cyclic input) 

 

or bridge to X2

X5: connection for reset button (24 VDC)

X6: connection for reset button 

X8:  connection for an additional standstill signal 

 

"high": standstill 

 

"low": motor runs

Outputs

FWS 2105:  (13/14) NO contact for safety functions (enabling path)

FWS 2505:  (13/14)-(23/24)-(33/34)-(43/44) NO contacts for safety 

 

functions (enabling paths)

 

(51/52) NC contact for signalling purposes

Additional transistor outputs Y1/Y2

Y1: "Enabling signal"; the enabling paths are closed

Y2:  "Fault"; if the fail-safe standstill monitor detects a fault, 

 

Y2 is enabled.

Reset input

A high signal at X6 deletes all detected faults of the fail-safe standstill 

monitor and causes the safety relays to be switched off.

Note

The additional outputs Y1 and Y2 must not be integrated in the safety 

circuit. The feed cables of both proximity switches (power supply) must 

be laid so that in case of a wire breakage only one proximity switch 

is dead (star-shaped routing). According to EN ISO 13849-1, control 

category 2, an individual fault must not lead to a loss of safety.

6  Set-up and maintenance

6.1  Functional testing

The safety function of the safety-monitoring module must be tested. 

The following conditions must be previously checked and met:

1. Proper itting of the safety-monitoring module

2. Fitting and integrity of the power cable

6.2  Maintenance

In the case of correct installation and adequate use, the safety-

 

monitoring module features maintenance-free functionality.

A regular visual inspection and functional test, including the following 

steps, is recommended:

• Check the correct ixing of the safety monitoring module

• Check the cable for damage.

Damaged or defective components must be replaced.

7  Disassembly and disposal

7.1  Disassembly

The safety monitoring module must be disassembled in the  
de-energised condition only.

7.2  Disposal

The safety monitoring module must be disposed of in an appropriate 
manner in accordance with the national prescriptions and legislations.

Summary of Contents for FWS 2105

Page 1: ...ted functions as part of an entire plant or machine It is the responsibility of the manufacturer of a machine or plant to ensure the proper functionality of the entire machinery or plant The safety monitoring module must be exclusively used in accordance with the versions listed below or for the applications authorised by the manufacturer Detailed information regarding the range of applications ca...

Page 2: ...ways actuated This can be realised by a minimum 1 1 division of the disc cam When the proximity switches are correctly installed the following exemplary signal sequence should be obtained by the utilisation of the switching hysteresis of the proximity switches during the rotation of the disc cam Proximity switch 1 Proximity switch 2 The adjustment of the proximity switches is facilitated when the ...

Page 3: ...connection for proximity switch 2 24 VDC X4 connection for proximity switch 2 cyclic input or bridge to X2 X5 connection for reset button 24 VDC X6 connection for reset button X8 connection for an additional standstill signal high standstill low motor runs Outputs FWS 2105 13 14 NO contact for safety functions enabling path FWS 2505 13 14 23 24 33 34 43 44 NO contacts for safety functions enabling...

Page 4: ...Y2 Y1 X2 X1 S22 S21 100mA max S14 S13 A1 A1 K2 P2 P1 K1 PE PE GND GND 24 230VAC DC 24 230VAC DC A1 A2 14 13 21 22 41 42 51 52 71 72 63 64 AZM161 12 12 FWS 2505 AES2335 FWS2505 13 14 L1 L1 A1 A1 100mA K1 K3 K3 A2 max Y1 Y2 X1 X2 X3 X4 X5 X6 K4 K4 3 K2 24 230VAC DC GND N N M R E S 0 A2 GND 24 230VAC DC A2 A2 X3 X4 X5 X6 X7 X8 14 24 34 33 23 13 Y2 Y1 X2 X1 S22 S21 100mA max S14 S13 A1 A1 K2 P2 P1 K1 ...

Page 5: ...tly During these intermissions the LED lashes with short pulses Table error indications Indication orange LED Error Cause 1 impulse Frequency sensor 1 too low Error input X2 Defective lead Defective proximity switch 2 impulses Frequency sensor 2 too low Error input X4 Defective lead Defective proximity switch 3 impulses Fault voltage X2 X4 One or both proximity switches supply no output voltage de...

Page 6: ...uppertal October 7 2009 Authorised signature Heinz Schmersal Managing Director Name of the safety component type FWS 2105 FWS 2505 Description of the safety component Safety monitoring module Fail safe standstill monitor Harmonised EC Directives 2006 42 EC EC Machinery Directive 2004 108 EC EMC Directive Person authorized for the compilation of the technical documentation Ulrich Loss Möddinghofe 3...

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