schmersal SRB 301MC User manual

SRB 301MC
SRB 301MC-ST
Operating instructions
Safety relay module
EN 1
1. About this document
1.1 Function
This operating instructions manual provides all the information you
need for the mounting, set-up and commissioning to ensure the safe
operation and disassembly of the safety-monitoring module. The
operating instructions must be available in a legible condition and a
complete version in the vicinity of the device.
1.2 Target group: authorised qualified personnel
All operations described in this operating instructions manual must
be carried out by trained specialist personnel, authorised by the plant
operator only.
Please make sure that you have read and understood these operating
instructions and that you know all applicable legislations regarding
occupational safety and accident prevention prior to installation and
putting the component into operation.
The machine builder must carefully select the harmonised standards
to be complied with as well as other technical specifications for the
selection, mounting and integration of the components.
1.3 Explanation of the symbols used
Information, hint, note:
This symbol is used for identifying useful additional
information.
Caution: Failure to comply with this warning notice could
lead to failures or malfunctions.
Warning: Failure to comply with this warning notice could
lead to physical injury and/or damage to the machine.
1.4 Appropriate use
The products described in these operating instructions are developed to
execute safety-related functions as part of an entire plant or machine. It
is the responsibility of the manufacturer of a machine or plant to ensure
the correct functionality of the entire machine 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
can be found in the chapter "Product description".
1.5 General safety instructions
The user must observe the safety instructions in this operating
instructions manual, the country specific installation standards as well
as all prevailing safety regulations and accident prevention rules.
Further technical information can be found in the Schmersal
catalogues or in the online catalogue on the Internet:
www.schmersal.net.
The information contained in this operating instructions manual is
provided without liability and is subject to technical modifications. There
are no residual risks, provided that the safety instructions as well as
the instructions regarding mounting, commissioning, operation and
maintenance are observed.
Content
1 About this document
1.1 Function ..............................................1
1.2 Target group: authorised qualied personnel..................1
1.3 Explanation of the symbols used ...........................1
1.4 Appropriate use ........................................1
1.5 General safety instructions ...............................1
1.6 Warning about misuse ...................................2
1.7 Exclusion of liability .....................................2
2 Product description
2.1 Ordering code .........................................2
2.2 Special versions........................................2
2.3 Purpose ..............................................2
2.4 Technical data .........................................2
2.5 Safety classication .....................................3
3 Mounting
3.1 General mounting instructions .............................3
3.2 Dimensions ...........................................3
4 Electrical connection
4.1 General information for electrical connection..................3
5 Operating principle and settings
5.1 LED functions..........................................3
5.2 Description of the terminals ...............................3
5.3 Notes ................................................4
6 Set-up and maintenance
6.1 Functional testing.......................................4
6.2 Maintenance ..........................................4
7 Disassembly and disposal
7.1 Disassembly...........................................4
7.2 Disposal ..............................................4
8 Appendix
8.1 Wiring examples .......................................5
8.2 Start conguration ......................................5
8.3 Sensor conguration ....................................5
8.4 Actuator conguration ...................................6
9 EU Declaration of conformity
x.000 / 01.2020/ v.A. - 101190702-EN / L / 2020-01-13 / AE-Nr. 11854
EN Operating instructions. . . . . . . . . . . . .pages 1 to 8
Original

2
Operating instructions
Safety relay module
SRB 301MC
SRB 301MC-ST
EN
1.6 Warning about misuse
In case of inadequate or improper use or manipulations of
the safety-monitoring module, personal hazards or damage
to machinery or plant components cannot be excluded.
The relevant requirements of the standards ISO 14119 and
ISO 13850 must be observed.
1.7 Exclusion of liability
We shall accept no liability for damages and malfunctions resulting from
defective mounting or failure to comply with this operating instructions
manual. The manufacturer shall accept no liability for damages
resulting from the use of unauthorised spare parts or accessories.
For safety reasons, invasive work on the device as well as arbitrary
repairs, conversions and modifications to the device are strictly
forbidden, the manufacturer shall accept no liability for damages
resulting from such invasive work, arbitrary repairs, conversions and/or
modifications to the device.
The safety-monitoring module must only be used when the enclosure is
closed, i.e. with the front cover fitted.
2. Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
SRB 301MC
➀
No. Option Description
➀
Screw connection
-ST Plug-in screw connection
Only if the information described in this operating instructions
manual are realised correctly, the safety function and therefo-
re the compliance with the Machinery Directive is maintained.
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
the standard version.
2.3 Purpose
The safety-monitoring modules for integration in safety circuits are
designed for fitting in control cabinets. They are used for the safe
evaluation of the signals of positive break position switches or magnetic
safety sensors for safety functions on sliding, hinged and removable
safety guards as well as emergency stop control devices and AOPDs.
The safety function is defined as the opening of the enabling circuits
13-14, 23-24 and 33-34 when the inputs S11-S12 and/or S21-S22 are
opened.
The safety-relevant current paths with the outputs contacts 13-14, 23-
24 and 33-34 meet the following requirements under observation of a
PFH value assessment (also refer to chapter 2.5 "Safety classification"):
• Control category 4 - PL e to ISO 13849-1-1
• SIL 3 to IEC 61508-2
• SILCL 3 to IEC 62061
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 control system, in which the safety
component is integrated, must be validated to the relevant
standards.
2.4 Technical data
General data:
Standards: IEC 60204-1, IEC 60947-5-1,ISO 13849-1, IEC 61508
Climate resistance: EN 60068-2-78
Mounting: snaps onto standard rail to EN 60715
Terminal designations: IEC 60947-1
Material of the housings: Plastic, glass-fibre reinforced thermoplastic,
ventilated
Material of the contacts: AgSnO, self-cleaning, positive drive
Weight: 230 g
Start conditions: Automatic or start button
Feedback circuit (Y/N): yes
Pull-in delay for automatic start: typ. 100 ms, max. 160 ms
Pull-in delay with reset button: typ. 15 ms, max. 20 ms
Drop-out delay in case of emergency stop: typ. 20 ms, max. 25 ms
Drop-out delay on "supply failure": typ. 80 ms
Bridging in case of voltage drops: typ. 80 ms
Mechanical data:
Connection type: refer to 2.1 Ordering code
Cable section: min. 0.25 mm² / max. 2.5 mm²
Connecting cable: rigid or flexible
Tightening torque for the terminals: 0.6 Nm
With removable terminals (Y/N): refer to 2.1 Ordering code
Mechanical life: 10 million operations
Electrical life: Derating curve available on request
Resistance to shock: 10 g / 11 ms
Resistance to vibration in accordance with EN 60068-2-6: 10 to 150 Hz,
Amplitude 0.35 mm
Ambient temperature: −25 °C … +60 °C
Storage and transport temperature: −40 °C … +85 °C
Protection class: Enclosure: IP40
Terminals: IP20
Clearance: IP54
Air clearances and creepage distances
to IEC 60664-1: 4 kV/2 (basic insulation)
EMC rating: to EMC Directive
Electrical data:
Contact resistance in new state: max. 100 mΩ
Power consumption: max. 2.0 W / 4.9 VA
Rated operating voltage Ue: 24 VDC −15% / +20%,
residual ripple max. 10%
24 VAC −15% / +10%
Frequency range: 50 / 60 Hz
Fuse rating for the operating voltage: Internal electronic trip, tripping
current > 500 mA, reset after approx. 1 sec.
Monitored inputs:
Cross-wire detection (Y/N): Yes
Wire breakage detection (Y/N): Yes
Earth leakage detection (Y/N): Yes
Number of NO contacts: 0
Number of NC contacts: 2
Cable length: 1,500 m with 1.5 mm²
2,500 m with 2.5 mm²
Conduction resistance: max. 40 Ω
Outputs:
Number of safety contacts: 3
Number of auxiliary contacts: 1
Number of signalling outputs: 0
Max. switching capacity of the safety contacts:
- 13-14, 23-24, 33-34
max. 250 V, 8 A ohmsch (ohmic
(inductive in case of suitable protective wiring),
min. 10 V / 10 mA,
residual current at ambient temperature up to:
45 °C: 24 A, 55 °C: 18 A, 60 °C: 12 A
Switching capacity of the auxiliary contacts: 41-42: 24 VDC / 2 A

3
SRB 301MC
SRB 301MC-ST
Operating instructions
Safety relay module
EN
Fuse rating of the safety contacts: external (Ik= 1000 A)
to IEC 60947-5-1
Safety fuse 10 A quick blow, 8 A slow blow
Fuse rating for the auxiliary contacts: external (Ik= 1000 A)
to IEC 60947-5-1
Safety fuse 2.5 A quick blow, 2 A slow blow
Utilisation category to IEC 60947-5-1: AC-15 / DC-13:
IEC 60947-5-1
Dimensions H x W x D: SRB 301MC: 100 x 22.5 x 121 mm
SRB 301MC-ST: 120 x 22.5 x 121 mm
The data specified in this manual are applicable when the component is
operated with rated operating voltage Ue ±0%.
Use copper conductors only.
Use 60°C/75°C conductors.
Use No. 28-12 AWG wire size only.
Tightening torque: 5 lb in.
Use 60/75°C wire only.
2.5 Safety classification
Standards: ISO 13849-1, IEC 61508, IEC 60947-5-1
PL: up to e
Control category: up to 4
DC: 99% (high)
CCF: > 65 points
PFH value: ≤ 2.00 × 10-8/h
SIL: up to 3
Mission time: 20 years
The PFH value of 2.00 × 10-8/h applies to the combinations of contact
load (current through enabling contacts) and number of switching
cycles (nop/y) mentioned in the table below. At 365 operating days per
year and a 24-hours operation, this results in the below-mentioned
switching cycle times (tcycle) for the relay contacts.
Diverging applications upon request.
Contact load nop/y tcycle
20 % 525,600 1.0 min
40 % 210,240 2.5 min
60 % 75,087 7.0 min
80 % 30,918 17.0 min
100 % 12,223 43.0 min
3. Mounting
3.1 General mounting instructions
Mounting: snaps onto standard DIN rails to EN 60715.
Snap the bottom of the 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 product is
installed, must meet the provisions laid down in the paragraph
"Electromagnetic Compatibility (EMC)" of IEC 60204-1.
3.2 Dimensions
All measurements in mm.
Device dimensions (H/W/D):
SRB 301MC: 100 x 22.5 x 121 mm
SRB 301MC-ST: 120 x 22.5 x 121 mm
4. Electrical connection
4.1 General information for electrical connection
As far as the electrical safety is concerned, the protection
against unintentional contact of the connected and therefore
electrically interconnected apparatus and the insulation of the
feed cables must be designed for the highest voltage, which
can occur in the device.
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
5.1 LED functions
• K1: Status channel 1
• K2: Status channel 2
• UB: Status operating voltage (LED is on, when the operating voltage
on the terminals A1-A2 is ON)
• Ui: Status internal operating voltage (LED is on, when the operating
voltage on the terminals A1-A2 is ON and the fuse has not been
triggered).
5.2 Description of the terminals
Voltages: A1
A2
+24 VDC/24 VAC
0 VDC/0 VAC
Inputs: S11 - S12
S21 - S22
S21 - S22
Input channel 1 (+)
Input channel 2 (+) (without cross-wire
short detection)
Input channel 2 (–) (with cross-wire short
detection)
Outputs: 13 - 14
23 - 24
33 - 34
41 - 42
First safety enabling circuit
Second safety enabling circuit
Third safety enabling circuit
Auxiliary NC contact as signalling contact
Start: X1 - X2 Feedback circuit and external reset

4
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
S
RB
301
S11
1
3
2
3
33
S12
14
2
4
3
4
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.

5
SRB 301MC
SRB 301MC-ST
Operating instructions
Safety relay module
EN
8. Appendix
8.1 Wiring examples
Dual-channel control, shown for a guard door monitor with two
position switches where one has a positive break contact; with
external reset button
J
(Fig. 4)
• Relay outputs: Suitable for 2-channel control, for increase in capacity
or number of contacts by means of contactors or relays with positive-
guided contacts.
• The control system recognises wire-breakage, earth faults and cross-
wire shorts in the monitoring circuit.
•
S
= Feedback circuit
K
A
K
B
K1 K2
F1
UB Ui
A1 S12 S11 S21
K
A
K
B
L1
N
K
A
K
B
K1
K2
13 23S22 X1
A2 14 24
33
34
41X2
a) nQS
QS
S
J
42
Fig. 4
a) Logic
8.2 Start configuration
External reset button (Fig. 5)
• The external reset button is integrated in the feedback circuit in series.
• The manual start or the activation of the module occurs when the
button is pressed (not when it is released!).
Automatic start (see Fig. 6)
• The automatic start is programmed by connecting the feedback circuit
to the terminals X1-X2. If the feedback circuit is not required, establish
a bridge.
• Caution: Not admitted without additional measure due to the risk
of gaining access by stepping behind!
• When the SRB 301MC safety-monitoring module is used with
the operating mode "Automatic start", an automatic restart after a
shutdown in case of emergency must be prevented by the upstream
control to IEC 60204-1 paragraph 9.2.5.4.2.
Due to the operating principle of the electronic fuse, the
customer must check that no hazard is caused by an
unexpected restart in circuits without reset button (automatic
reset).
X2
X1
K
A
J
K
B
X2
X1
K
A
K
B
Fig. 5 Fig. 6
8.3 Sensor configuration
Single-channel 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-channel emergency stop circuit with command devices to
ISO 13850 and IEC 60947-5-5 (Fig. 8)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are not detected.
• Control category 4 – PL e to ISO 13849-1 possible (with protective
wiring)
Dual-channel emergency stop circuit with command devices to
ISO 13850 and IEC 60947-5-5 (Fig. 9)
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the control circuits are detected.
• Category 4 – PL e to ISO 13849-1 possible.
S12
S11
S22
S12
nQ
S
QS
S12
S11
S22
S21
nQ
S
QS
S12
S11
S22
S21
nQ
S
QS
Fig. 7 Fig. 8 Fig. 9
Single-channel guard door monitoring circuit with interlocking
devices to ISO 14119 (Fig. 10)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Category 1 – PL c to ISO 13849-1 possible.
Dual-channel guard door monitoring circuit with interlocking
device to ISO 14119 (see Fig. 11)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the monitoring circuits are not detected.
• Control category 4 – PL e to ISO 13849-1 possible (with protective
wiring)
Dual-channel guard door monitoring circuit with interlocking
device to ISO 14119 (see Fig. 12)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Cross-wire shorts between the guard monitoring circuits are detected.
• Category 4 – PL e to ISO 13849-1 possible.
S12
S11
S22
S12
nQ
S
QS
S12
S11
S22
S21
nQ
S
QS
S12
S11
S22
S21
nQ
S
QS
Fig. 10 Fig. 11 Fig. 12

6
Operating instructions
Safety relay module
SRB 301MC
SRB 301MC-ST
EN
Dual-channel control of a safety-related electronic
(microprocessor-based) safety guard with p-type transistor
outputs e.g. AOPDs to IEC 61496 (see Fig. 13)
• Wire breakage and earth leakage in the control circuits are detected.
• The safety-monitoring module therefore is not equipped with a cross-
wire short detection here. The safety-monitoring module therefore is
not equipped with a cross-wire short detection here.
• Category 3 – PL e to ISO 13849-1 possible.
• If cross-wire shorts in the control circuits are detected by the safety
guard:
Control category 4 – PL e to ISO 13849-1 possible.
Dual-channel control of magnetic safety switches according to
IEC 60947-5-3 (see Fig. 14)
• The control system recognises wire breakage and earth faults in the
control circuit.
• Cross-wire shorts between the control circuits are not detected.
• Category 3 – PL e to ISO 13849-1 possible.
Dual-channel control of magnetic safety switches according to
IEC 60947-5-3 (see Fig. 15)
• The control system recognises wire breakage and earth faults in the
control circuit.
• Cross-wire shorts between the control circuits are detected.
• Category 4 – PL e to ISO 13849-1 possible.
The connection of magnetic safety switches to the
SRB 301MC safety-monitoring 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. 240 mW
– switching voltage: min. 24 VDC
– switching current: min. 10 mA
For example, the following safety sensors meet the
requirements:
– BNS 33-02Z-2187, BNS 33-02ZG-2187
– BNS 260-02Z, BNS 260-02ZG
– BNS 260-02-01Z, BNS 260-02-01ZG
When sensors with LED are wired in the control circuit
(protective circuit), the following rated operating voltage must
be observed and respected:
– 24 VDC with a max. tolerance of –5 %/+20 %
– 24 VAC with a max. tolerance of –5 %/+10 %
Otherwise availability problems could occur, especially in
series-wired sensors, where a voltage drop in the control
circuit is triggered by LEDs for instance.
S12
+24V +24V
S22
nQ
S
QS
S12 S22
S11 S21
nQ
S
QS
S12 S22
S11 S21
nQS
QS
Fig. 13 Fig. 14 Fig. 15
8.4 Actuator configuration
Single-channel control (see Fig. 16)
• Suitable for increase in capacity or number of contacts by means of
contactors or relays with positive-guided contacts.
• If the feedback circuit
is not required, establish a bridge.
•
S
= Feedback circuit
Dual-channel control with feedback circuit (Fig. 17)
• Suitable for increase in capacity or number of contacts by means of
contactors or relays with positive-guided contacts.
• If the feedback circuit is not required, establish a bridge.
•
S
= Feedback circuit
X1 X2 13
14
K
A
K
A
K
A
S
L1
N
X1 X2 13
14
K
B
K
A
K
B
K
A
K
B
L1
N
K
A
S
Fig. 16 Fig. 17

7
EN
SRB301MC-G-DE
SRB 301MC
SRB 301MC-ST
Operating instructions
Safety relay module
9. EU Declaration of conformity
Name of the component: SRB301MC,
SRB301MC-ST
Description of the component: Safety-monitoring module for emergency stop circuits,
guard door monitoring, magnetic safety switches and
AOPDs
Relevant Directives: Machinery Directive
EMC-Directive
RoHS-Directive
2006/42/EC
2014/30/EU
2011/65/EU
Applied standards: EN 60947-5-1:2004 + AC:2005 + A1:2009,
ISO 13850:2015,
ISO 13849-1:2015,
ISO 13849-2:2012,
Notied body for the prototype test: TÜV Rheinland Industrie Service GmbH
Alboinstr. 56, 12103 Berlin
ID n°: 0035
EC-prototype test certicate: 01/205/5035.01/16
Person authorised for the compilation
of the technical documentation:
Oliver Wacker
Möddinghofe 30
42279 Wuppertal
Place and date of issue: Wuppertal, 13. January 2020
Authorised signature
Philip Schmersal
Managing Director
EU Declaration of conformity
Original K.A. Schmersal GmbH & Co. KG
Möddinghofe 30
42279 Wuppertal
Germany
Internet: www.schmersal.com
We hereby certify that the hereafter described components both in their basic design and construction conform
to the applicable European Directives.
The currently valid declaration of conformity can be
downloaded from the internet at www.schmersal.net.

K.A. Schmersal GmbH & Co. KG
Möddinghofe 30, 42279 Wuppertal
Germany
Phone: [phone]
Telefax: [phone]
E-Mail: [email protected]
Internet: www.schmersal.com