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Operating instructions

Safety relay module

SRB 301MC

SRB 301MC-ST

EN

5.3  Notes

Signalling outputs must not be used in safety circuits.

Due to the operating principle of the electronic fuse, the cus-

tomer must check that no hazard is caused by an unexpected 

restart in circuits without reset button (automatic reset).

Opening the front cover (see Fig. 2)

•  To open the front cover, insert a slotted screwdriver in the top and 

bottom cover notch and gently lift it.

•  When the front cover is open, the electrostatic discharge requirements 

must be respected and observed.

•  After setting, the front cover must be fitted back in position.

Only touch the components after electrical discharge!

Setting the switch (see Fig. 3)

•  The cross-wire short monitoring function (factory setting) is 

programmed by means of the switch underneath the front cover of the 

safety-monitoring module.

•  The switch must only be operated in de-energised condition by means 

of a finger or an insulated blunt tool.

•  Pos. nQS (top): Not cross-wire short proof, 

suitable for 1-channel applications with outputs connected to potential 

in the control circuits.

•  Pos. QS (bottom), Cross-wire short proof: 

suitable for 2-channel applications without outputs connected to 

potential in the control circuits.

U

B

U

i

K1
K2

SRB 

301

S11 13 23 33
S12 14 24 34

S21 42 X2 A2

S22 41 X1 A1

U

B

U

i

K1
K2

SRB 

301

S11 13 23 33
S12 14 24 34

S21 42 X2 A2

S22 41 X1 A1

U

B

U

i

K1
K2

SRB

301

S11 13 23 33
S12 14 24 34

S21 42 X2 A2

S22 41 X1 A1

S12 18 28 38

S22 45 X1 A1

nQS
QS

Fig. 1

Fig. 2

Fig. 3

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. Correct fixing

2. Check the integrity of the cable entry and connections

3.  Check the safety-monitoring module's enclosure for damage.

4.  Check the electrical function of the connected sensors and their 

influence on the safety-monitoring module and the downstream 

actuators

6.2  Maintenance

A regular visual inspection and functional test, including the following 

steps, is recommended:

1. Check the correct fixing of the safety-monitoring module

2. Check the cable for damages

3. Check electrical function

If a manual functional check is necessary to detect a 

possible accumulation of faults, then this must take place 

during the intervals noted as follows:

•  at least every month for PL e with category 3 or 

category 4 (according to ISO 13849-1) or SIL 3 with HFT 

(hardware fault tolerance) = 1 (according to IEC 62061),

•  at least every 12 months for PL d with category 3 

(according to ISO 13849-1) or SIL 2 with HFT (hardware 

fault tolerance) = 1 (according to IEC 62061).

Damaged or defective components must be replaced.

7.  Disassembly and disposal

7.1  Disassembly

The safety-monitoring module must be disassembled in a de-energised 

condition only.

Push up the bottom of the enclosure and hang out slightly tilted 

forwards.

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 SRB 301MC

Page 1: ...odule 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 can be found...

Page 2: ...061 To determine the Performance Level PL to ISO 13849 1 1 of the entire safety function e g sensor logic actuator an assessment of all relevant components is required The entire concept of the contro...

Page 3: ...e enclosure slightly tilted forwards in the standard rail and push up until it latches in position To avoid EMC disturbances the physical ambient and operational conditions at the place where the prod...

Page 4: ...S12 14 24 34 S21 42 X2 A2 S22 41 X1 A1 S12 18 28 38 S22 45 X1 A1 nQS QS Fig 1 Fig 2 Fig 3 6 Set up and maintenance 6 1 Functional testing The safety function of the safety monitoring module must be te...

Page 5: ...l emergency stop circuit with command devices to ISO 13850 and IEC 60947 5 5 Fig 7 Wire breakage and earth leakage in the control circuits are detected Category 1 PL c to ISO 13849 1 possible Dual cha...

Page 6: ...toring module is only admitted when the requirements of the standard IEC 60947 5 3 are observed As the technical data are regarded the following minimum requirements must be met switching capacity min...

Page 7: ...ype test T V Rheinland Industrie Service GmbH Alboinstr 56 12103 Berlin ID n 0035 EC prototype test certificate 01 205 5035 01 16 Person authorised for the compilation of the technical documentation O...

Page 8: ...K A Schmersal GmbH Co KG M ddinghofe 30 42279 Wuppertal Germany Phone 49 202 6474 0 Telefax 49 202 6474 100 E Mail info schmersal com Internet www schmersal com...

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