Operating instructions
Safety-monitoring module
Operating instructions. . . . . . . . . . . . .pages 1 to 8
EN
Original
SRB 304ST
8 Appendix
8.1 Wiring examples .......................................5
8.2 Start conguration ......................................5
8.3 Sensor conguration ....................................5
8.4 Actuator conguration ...................................6
9 EU Declaration of conformity
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.
Content
1 About this document
1.1 Function ..............................................1
1.2 Target group: authorised qualied 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 Destination and use .....................................2
2.4 Technical data .........................................2
2.5 Safety classication .....................................3
3 Mounting
3.1 General mounting instructions .............................3
3.2 Dimensions ...........................................3
4 Rear side Electrical connection
4.1 General information for electrical connection..................3
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".
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 DIN EN 60204-1.
x.000 / August 2017 / v.A. - 101193020-EN / D / 2017-08-17 / AE-Nr. 7730
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
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.
EN
1
Operating instructions
Safety-monitoring module
SRB 304ST
The entire concept of the control system, in which the safety
component is integrated, must be validated to EN ISO 13849-2.
There are no residual risks, provided that the safety instructions as well
as the instructions regarding mounting, commissioning, operation and
maintenance are observed.
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
EN 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 304ST
Only if the information described in this operating instructions
manual are realised correctly, the safety function and therefore
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 Destination and use
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 for safety
functions or magnetic safety sensors on sliding, hinged and removable
safety guards as well as emergency stop control devices and AOPD's
(safety light barriers).
The safety function is defined as the opening of enabling circuits 13-14,
23-24 and 33-34 when the inputs S11-S12 and/or S21-S22 and/or
S31-S32 are opened. The safety-relevant current paths with the output
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 DIN EN ISO 13849-1
– Corresponds to SIL 3 to DIN EN 61508-2
– SILCL 3 to DIN EN 62061
2.4 Technical data
General data:
Standards: IEC/EN 60204-1, EN 60947-5-1,
EN ISO 13849-1, IEC/EN 61508
Climate resistance: EN 60068-2-78
Mounting: Snaps onto standard DIN rail to EN 60715
Terminal designations: EN 60947-1
Material of the housings: Plastic, glass-fibre reinforced thermoplastic,
ventilated
Material of the contacts: AgSnO, self-cleaning, positive drive
Weight: 340 g
Start conditions: Automatic or start button (monitored)
Feedback circuit available: yes
Pull-in delay for automatic start: typ. 250 ms
Pull-in delay with reset button: typ. 20 ms
Drop-out delay in case of emergency stop: typ. 30 ms / max. 36 ms
Drop-out delay on "supply failure": typ. 80 ms
Mechanical data:
Connection type: Screw connection
Cable sections: 0.25 … 2.5 mm²
Connecting cable: rigid or flexible
Tightening torque for the terminals: 0.6 Nm
With removable terminals: yes
Mechanical life: 10 million operations
Resistance to shock: 10 g / 11 ms
Resistance to vibrations to EN 60068-2-6: 10 … 55 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/EN 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. 1.9 W / 4.9 VA,
plus signalling outputs
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 F1: > 2.5 A;
tripping current F2: > 50 mA (S11-S31) / > 800 mA (X4)
Current and voltage at the control circuits:
- S11, S12, S21, S22, S31, S32: 24 VDC, 10 mA
- X1, X2: 24 VDC, start impulse 350 mA / 15 ms
- X3, X4: 24 VDC, start impulse 130 mA / 80 ms
- X4, X5: 24 VDC, start impulse 140 mA / 15 ms
Monitored inputs:
Cross-wire detection: optional
Wire breakage detection: yes
Earth connection detection: yes
Number of NO contacts: 0
Number of NC contacts: 2
Cable length: 850 m with 1.5 mm²,
1,400 m with 2.5 mm²
Conduction resistance: max. 10 Ω
To determine the Performance Level (PL) of the entire safety function
(e.g. sensor, logic, actuator) to DIN EN ISO 13849-1, an analysis of all
relevant components is required.
2
EN
Operating instructions
Safety-monitoring module
SRB 304ST
Outputs:
Number of safety contacts: 3
Number of auxiliary contacts: 1
Number of signalling outputs: 3
Max. switching capacity of the safety contacts: 13-14, 23-24, 33-34:
max. 250 V, 8 A ohmic (inductive in
case of suitable protective wiring);
AC-15: 230 VAC / 6 A, DC-13: 24 VDC / 6 A;
residual current at ambient temperature
up to 55°C: 24 A / 60°C: 18 A
Switching capacity of the signalling outputs: Y1-Y3: 24 VDC / 100 mA
Switching capacity of the auxiliary contacts: 41-42: 24 VDC / 2 A
Fuse rating of the safety contacts: external (Ik = 1000 A)
to EN 60947-5-1
Safety fuse 10 A quick blow, 8 A slow blow
Fuse rating of the signalling outputs: 100 mA slow blow
Fuse rating for the auxiliary contacts: external (Ik = 1000 A)
to EN 60947-5-1
Safety fuse 2.5 A quick blow, 2 A slow blow
Utilisation category to EN 60947-5-1: AC-15, DC-13
Dimensions H x W x D: 100 mm × 45 mm × 121 mm
The data specified in this manual are applicable when the component is
operated with rated operating voltage Ue ±0%.
2.5 Safety classification
Standards: EN ISO 13849-1, IEC 61508, EN 60947-5-1
PL: up to e
Control category: up to 4
PFH value: ≤ 2.0 x 10-8/h
SIL: up to 3
Service life: 20 years
The PFH value of 2.0 × 10-8/h applies to the combinations of contact
load (current through enabling contacts) and number of switching
cycles (n
year and a 24-hours operation, this results in the below-mentioned
switching cycle times (t
Diverging applications upon request.
) mentioned in the table below. At 365 operating days per
op/y
) for the relay contacts.
cycle
Contact load n
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
op/y
t
cycle
3. Mounting
4. Rear side 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
(see Fig. 1)
Voltages: A1
A1.1
A2
Inputs: S11-S12
S21-S22
S31-S32
Outputs: 13-14
23-24
33-34
41-42
Start: X1-X2
X3-X4
X4-X5
Y1 + Y2
Y3
+24 VDC / 24 VAC
+24 VDC / 24 VAC
0 VDC / 24 VAC
Input channel 1 (+)
Input channel 2 (–)
(with cross-wire short detection)
Input channel 2 (+) (without cross-wire
short detection)
First safety enabling circuit
Second safety enabling circuit
Third safety enabling circuit
Auxiliary NC contact as signalling contact
Feedback circuit
Feedback circuit and external reset
(monitored)
Automatic start
Signalling output channel 1 and 2
Signalling output fuse F3
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 DIN rail
and push up until it latches in position.
3.2 Dimensions
All measurements in mm.
Device dimensions (H/W/D): 100 x 45 x 121 mm
with plugged-in terminals: 120 × 45 × 121 mm
EN
Signalling outputs must not be used in safety circuits.
3
Operating instructions
S1
Safety-monitoring module
SRB 304ST
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!
13 23 33 41
A1 S11 S12 X5 X3 X1X2 Y2
U
B
U
i
K1
SRB 304ST
K2
A2 S21 A1.1 S22
14 24 34 42
X4 S32S31
Y1
Y3
13 23 33 41
A1 S11 S12 X5 X3 X1X2 Y2
U
B
U
i
K1
SRB 304ST
K2
A2 S21 A1.1 S22
14 24 34 42
X4 S32S31
Y1
Y3
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
The device has to be integrated into the periodic check-ups
according to the Ordinance on Industrial Safety and Health,
however at least 1 × year.
Damaged or defective components must be replaced.
7. Disassembly and disposal
Fig. 1 Fig. 2
Resetting the hybrid fuse
• The hybrid fuse of the safety-monitoring module can be reset
by switching the operating voltage off and back on or by actuating
button S1.
• Button S1 is located underneath the front cover of the safetymonitoring module (see Fig. 2 and 3).
Fig. 3
5.3 Notes
Signalling outputs (see fig. 4)
• The input circuits are signalled through the signalling outputs Y1
(channel 1) and Y2 (channel 2).
• The status of the hybrid fuse is signalled through signalling output
Y3. If the hybrid fuse is not activated, Y3 is supplied with operating
voltage.
+24 V
F2
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.
Fig. 4
4
Y3Y2Y1
EN
Operating instructions
Safety-monitoring module
SRB 304ST
8. Appendix
8.1 Wiring examples
Dual-channel control, shown for a guard door monitor; with two
contacts A and B, where at least one is a positive break contact;
with external reset button J (see Fig. 5)
• Relay outputs: Suitable for 2-channel control, for increase in capacity
or number of contacts by means of contactors or relays with positiveguided contacts.
• The control system recognises wire breakage, earth faults and
cross-wire shorts in the monitoring circuit.
• S = Feedback circuit
S
A1 A1.1 S21 S22 S11 X5JX3 X4 S12 X1 X2 S32 S31
F1
F2
K1
K2
a)
K1
K2
A2 Y3 Y2 Y1
13 23 33
K1
K2
14 24 34 42
K
A
L1
41
K1
K
A
K
K2
B
K
B
8.3 Sensor configuration
Single-channel emergency stop circuit with command devices to
DIN EN ISO 13850 (EN 418) and EN 60947-5-5 (Fig. 8)
• Wire breakage and earth leakage in the control circuits are detected.
• Category 2 – PL d to DIN EN 13849-1 possible
Dual-channel emergency stop circuit with command devices to
DIN EN ISO 13850 (EN 418) and EN 60947-5-5 (Fig. 9)
• The control system recognises wire-breakage and earth faults in the
control circuit.
• Cross-wire shorts between the control circuits are not detected.
• Category 4 – PL e to DIN EN ISO 13849-1 possible (with protective
wiring)
Dual-channel emergency stop circuit with command devices to
DIN EN ISO 13850 (EN 418) and EN 60947-5-5 (Fig. 10)
• 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 DIN EN ISO 13849-1 possible.
S11
S12
S21
S12
S32
S22
S11
S31
S21
S12
S32
S22
S11
S21
S31
S12
S22
S32
Fig. 5 a) channel control
8.2 Start configuration
External reset button (with edge detection) (see Fig. 6)
• The external reset button is integrated as shown.
• The safety-monitoring module is activated by the reset (after release)
of the reset button (= detection of the trailing edge). Faults in the reset
button, e.g. welded contacts or manipulations which could lead to an
inadvertent restart, are detected in this configuration and will result in
an inhibition of the operation.
Automatic start (see Fig. 7)
• The automatic start is programmed by connecting the feedback circuit
to the terminals. If the feedback circuit is not required, establish a
bridge.
• Caution:
When the device 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 EN 60204-1, paragraph
9.2.5.4.2.
X1
X3
K
A
S
K
B
X1
X5
K
A
S
K
B
Fig. 8 Fig. 9 Fig. 10
Single-channel guard door monitoring circuit with interlocking
devices to ISO 14119 (Fig. 11)
• At least one contact with positive break required.
• Wire breakage and earth leakage in the control circuits are detected.
• Category 2 – PL d to DIN EN ISO 13849-1 possible.
Dual-channel guard door monitoring circuit with interlocking
device to ISO 14119 (see Fig. 12)
• With at least one positive-break position switch
• The control system recognises wire-breakage and earth faults in the
control circuit.
• Cross-wire shorts between the control circuits are not detected.
• Category 4 – PL e to DIN EN ISO 13849-1 possible
(with protective wiring)
Dual-channel guard door monitoring circuit with interlocking
device to ISO 14119 (see Fig. 13)
• With at least one positive-break position switch
• 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 DIN EN 13849-1 possible
S11
S12
S21
S11
S31
S21
S11
S21
S31
X2
X4
Fig. 6 Fig. 7
X4
X2
S12
S32
S22
Fig. 11 Fig. 12 Fig. 13
EN
S12
S32
S22
S12
S22
S32
5
Operating instructions
L1
L1
L1
Safety-monitoring module
SRB 304ST
Dual-channel control of a safety-related electronic
(microprocessor-based) safety guard with p-type transistor
outputs e.g. AOPD's to EN IEC 61496 (see Fig. 14)
• The control system recognises wire-breakage and earth faults in the
control circuit.
• The safety-monitoring module therefore is not equipped with a crosswire short detection here. The safety-monitoring module therefore is
not equipped with a cross-wire short detection here.
• Category 3 – PL e to DIN EN ISO 13849-1 possible.
• If cross-wire shorts in the control circuits are detected by the safety
guard:
control category 4 – PL e to DIN EN ISO 13 849-1 possible.
Dual-channel control of magnetic safety switches to EN 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 not detected.
• Category 3 – PL e to DIN EN ISO 13849-1 possible.
Dual-channel control of magnetic safety switches to EN 60947-5-3
(see Fig. 16)
• The control system recognises wire-breakage and earth faults in the
control circuit.
• Cross-wire shorts between the control circuits are detected.
• Category 3 – PL e to DIN EN ISO 13849-1 possible.
+24V
+24V
S21
S31
S11
S21
S21
S11
S31
8.4 Actuator configuration
Single-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.
• S = feedback circuit:
If the feedback circuit is not required, establish a bridge.
Dual-channel control with feedback circuit (Fig. 18)
• Suitable for increase in capacity or number of contacts by means of
contactors or relays with positive-guided contacts.
• S = feedback circuit:
If the feedback circuit is not required, establish a bridge.
K
B
K
A
S
X1 X2 13
14
K
A
N
Fig. 17 Fig. 18
S
K
A
X1 X2 13
N
14
K
K
B
A
S12
S32
S22
Fig. 14 Fig. 15 Fig. 16
The connection of magnetic safety switches to the
SRB 304ST safety-monitoring module is only admitted
when the requirements of the standard EN 60 947-5-3
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 from Schmersal
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 %
S32
S12
S22
S12
S22
S32
Differential control with feedback circuit (see Fig. 19)
• Suitable for increase in capacity or number of contacts by means of
contactors or relays with positive-guided contacts.
• S = feedback circuit:
If the feedback circuit is not required, establish a bridge. If the
enabling circuit of the controller must be equipped with its own
feedback circuit, this circuit must be integrated as shown in the wiring
example "dual-channel control with feedback circuit" (see there).
K
A
S
X1 X2 2313
2414
a)
N
Fig. 19 a) Enabling signal controller
K
A
Otherwise availability problems could occur, especially in
6
series-wired sensors, where a voltage drop in the control
circuit is triggered by LED's for instance.
EN
Operating instructions
Safety-monitoring module
9. EU Declaration of conformity
EU Declaration of conformity
SRB 304ST
Original K.A. Schmersal GmbH & Co. KG
We hereby certify that the hereafter described components both in their basic design and construction conform
to the applicable European Directives.
Name of the component: SRB 304ST
Description of the component: Safety-monitoring module for emergency stop circuits,
Relevant Directives: Machinery Directive
Applied standards: EN 60947-5-1:2004 + AC:2005 + A1:2009,
Notied body for the prototype
test:
Möddinghofe 30
42279 Wuppertal
Germany
Internet: www.schmersal.com
guard door monitoring, magnetic safety switches and AOPDs
EMC-Directive
RoHS-Directive
EN 60947-5-3:2013 (in extracts),
ISO 13850:2015,
ISO 13849-1:2015,
ISO 13849-2:2012
TÜV Rheinland Industrie Service GmbH
Alboinstr. 56, 12103 Berlin
ID n°: 0035
2006/42/EC
2014/30/EU
2011/65/EU
EC-prototype test certicate: 01/205/5222.01/17
Person authorised for the compilation
of the technical documentation:
Place and date of issue: Wuppertal, August 17, 2017
SRB304ST-D-EN
Oliver Wacker
Möddinghofe 30
42279 Wuppertal
Authorised signature
Philip Schmersal
Managing Director
The currently valid declaration of conformity can be
downloaded from the internet at www.schmersal.net.
EN
7
K. A. Schmersal GmbH & Co. KG
Möddinghofe 30, D - 42279 Wuppertal
Postfach 24 02 63, D - 42232 Wuppertal
Phone: +49 - (0)2 02 - 64 74 - 0
Telefax: +49 - (0)2 02 - 64 74 - 1 00
E-Mail: info@schmersal.com
Internet: http://www.schmersal.com
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