schmersal SRB-E-402FWS-TS User manual

SRB-E-402FWS-TS
Operating instructions
Fail-safe delay timer / Standstill monitor
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.
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 ........................................2
1.5 General safety instructions ...............................2
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 .........................................3
2.5 Derating / electrical lifespan of safety contacts ................3
2.6 Safety classication .....................................4
3 Mounting
3.1 General mounting instructions .............................4
3.2 Dimensions ...........................................4
4 Electrical connection
4.1 General information for electrical connection..................4
4.2 Coding of connecting terminals ............................4
5 Operating principle and settings
5.1 Description of the terminals and LED indications ..............5
5.2 Adjustable applications ..................................6
5.3 Changing setting or application ............................6
6 Diagnostic
6.1 LED indications ........................................7
6.2 Malfunctions...........................................7
6.3 Warnings standstill monitoring function ......................7
7 Wiring examples
7.1 Application example fail-safe delay timer.....................8
7.2 Application examples safe standstill monitoring ...............9
7.3 Start conguration, time monitoring / standstill monitoring ......10
7.4 Start conguration safety guard monitoring ..................10
7.5 Sensor conguration ...................................10
8 Set-up and maintenance
8.1 Commissioning .......................................11
8.2 Functional testing......................................11
8.3 Behaviour in the case of faults............................11
8.4 Setting report .........................................11
8.5 Maintenance .........................................12
9 Disassembly and disposal
9.1 Disassembly..........................................12
9.2 Disposal .............................................12
10 Appendix
10.1 Wiring/circuit information...............................12
11 EU Declaration of conformity
x.000 / 03.2023 / v.A. - 103014800-EN / E / 2023-03-14 / AE-Nr. 15500
EN Operating instructions. . . . . . . . . . . .pages 1 to 14
Original

2
Operating instructions
Fail-safe delay timer / Standstill monitor SRB-E-402FWS-TS
EN
1.4 Appropriate use
The Schmersal range of products is not intended for private consumers.
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 fail-safe delay timer 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:
products.schmersal.com.
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.
1.6 Warning about misuse
In case of inadequate or improper use or manipulations of
the fail-safe delay timer, personal hazards or damage to
machinery or plant components cannot be excluded.
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 relay module is to be operated in an area in which access
by personnel is restricted.
2. Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
SRB-E-402FWS-TS-
➀
No. Option Description
➀
Plug-in screw clamps: single wire (rigid)
or fine wire (flexible): 0.2 … 2.5 mm²;
fine wire with ferrule: 0.25 … 2.5 mm²
CC Plug-in cage clamps: single wire (rigid)
or fine wire (flexible): 0.2 … 1.5 mm²;
fine wire with ferrule: 0.25 … 1.5 mm²
Only if the action described in these operating instructions is
carried out correctly will the safety function be safeguarded,
including compliance with the Machinery Directive.
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
Safe pull-in delay function
The fail-safe delay timers for integration in safety circuits are designed
for fitting in control cabinets. They serve as a reliable means of
evaluating actuation signals and delayed authorisation of protective
equipment.
The safety function is defined as deactivation of the fail-safe outputs
Q1 and Q2 when inputs S12 and/or S22 are opened and the fail-safe
outputs are activated when the set activation delay time has elapsed.
Safe standstill monitoring function
The fail-safe standstill monitor is designed for control cabinet mounting.
Standstill monitors serve for the fail-safe detection of the machine
standstill and control of solenoid interlocks. If the safety control module
has detected standstill, a solenoid interlock can be operated using the
fail-safe outputs Q1 and Q2.
The signals from one or two proximity switches are used to detect
standstill. Optionally, an additional standstill signal can be monitored.
The additional standstill signal can be derived from an already available
standstill signal of the machine, e.g. evaluation of a tachogenerator by
a PLC or the standstill output of a frequency converter.
Protective equipment function
The safety relay modules for use in safety circuit are used for the
safe evaluation of the signals from solenoid interlocks, positive break
position switches or safety sensors on sliding, hinged and removable
protective equipment, emergency stop control devices, safety solenoid
switches and AOPDs.
The safety function is defined as deactivating outputs 13/14, 23/24
when inputs S32 and/or S42 are opened.
Taking account of a PFH value assessment, the safety-relevant current
paths meet the following requirements (see also chapter 2.6 “Safety
classification”)
– Category 4 – PL e to EN ISO 13849-1
– SIL 3 to IEC 61508 and EN 62061

3
SRB-E-402FWS-TS
Operating instructions
Fail-safe delay timer / Standstill monitor
EN
To determine the Performance Level (PL) to EN ISO 13849-1 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: EN 60204-1, EN 60947-5-1, EN ISO 13849-1,
IEC 61508, EN 62061
EMC rating: to EMC Directive
Air clearances and creepage distances: to EN 60664-1
Mounting: standard rail to EN 60715
Terminal designations: EN 60947-1
Electrical characteristics:
Rated operating voltage Ue: 24 VDC –20%/+20%,
residual ripple max. 10%
Frequency range: −
Mains unit/mains power supply: An ES1 or PELV/SELV mains adapter
must be used as a voltage source or be ensured by means
of additional measures so that the output voltage of the
power adapter in the event of an error does not exceed 60 V.
Mains power supply must harmonise with device safety
(characteristic/melting property) so that triggering is ensured.
Power consumption: 3 W (+ load of the safety outputs)
Fuse rating for the operating voltage: We recommend a circuit
breaker type Z (max. 16 A) or a fine
fuse (max. 15 A, delayed action).
UL Rating of external fuse: max. 16 A, only use fuses in
accordance with UL 248 series
Insulation values to EN 60664-1:
Rated insulation voltage Ui:
- Safety contacts: 250 V
- Safety outputs: 50 V
Rated impulse withstand voltage Uimp:
- Safety contacts 13/14, 23/24: 6 kV
- Safety output Q1/Q2: 0.8 kV
Overvoltage category: III
Degree of pollution: 2
Drop-out delay on "supply failure": < 10 ms
Bridging in case of voltage drops: typ. 5 ms
Readiness after switching on voltage: < 1.5 s
Frequency measurement tolerance: < 2%
Time measurement tolerance: 2% + 30 ms
Control current circuits/inputs:
Inputs S12, S22, S32, S42: 24 VDC / 8 mA
Max. input frequency: 6000 Hz
Inputs X2, X3, X4, X5, X7: 24 VDC / 8 mA
Clock outputs S11, S21, S31, S41: > 20 VDC, 10 mA per output
Cable length: 1500 m with 1.5 mm²
2500 m with 2.5 mm²
Conduction resistance: max. 40 Ω
Relay outputs:
Switching capacity of the safety contacts: 13/14, 23/24:
max. 250 V, 6 A ohmic,
min. 10 VDC / 10 mA
(Derating see 2.5)
Fuse rating of the safety contacts: external (Ik= 1000 A)
to EN 60947-5-1
Safety fuse 10 A quick blow, 6 A slow blow
Utilisation category to EN 60947-5-1: AC-15: 230 V / 4 A
DC-13: 24 V / 4 A
Switching capacity of the auxiliary contacts: 41-42: 24 VDC / 1 A
Fuse rating for the auxiliary contact: safety fuse
2.5 A quick blow, 2 A slow blow
Electrical life: refer to 2.5
Mechanical life: 10 million operations
Semi-conductor outputs:
Switching capacity of the safety outputs: Q1/Q2: max. 2 A
Voltage drop: < 0.5 V
Leakage current: < 1 mA
Max. fuse rating of the safety outputs: refer to "Operating voltage"
Test impulse of the safety outputs: < 1 ms (negative),
< 100 µs (positive)
Utilisation category to EN 60947-5-1: DC-13: 24 V / 2A
Switching capacity of signaling outputs: semi-conductor outputs Y1:
24 VDC/100 mA
Fuse rating of the signalling outputs: internal electronic trip,
tripping current > 100 mA
Electrical life: (Derating refer to 2.5)
Max. switching cycles / minute: 20
Inductive consumers: provision is to be made for suitable
protective wiring for suppression.
Mechanical data:
Connection type: refer to 2.1
Cable section: refer to 2.1
Connecting cable: rigid or flexible
Tightening torque for the terminals: 0.5 Nm
Material of enclosure: glass-fibre reinforced
thermoplastic, ventilated
Weight: 180 g
Ambient conditions:
Ambient temperature: –25°C … +60°C
(non condensing)
Storage and transport temperature: –40°C … +85°C
(non condensing)
Degree of protection: Enclosure: IP40
Terminals: IP20
Clearance: IP54
Resistance to shock: 30 g / 11 ms
Resistance to vibrations
to EN 60068-2-6: 10 ... 55 Hz, amplitude 0.35 mm
Altitude: max. 2,000 m
2.5 Derating / electrical lifespan of safety contacts
No derating with individual installation of modules.
Derating on request if several modules are installed one after the
other without spacing and with maximum output load and ambient
temperatures.
Electrical life of the safety contacts
DC13 24V
AC15 230V
AC1 230V
DC1 24V
10.000.000
1.000.000
100.000
10.000
0 1 2 3 4 5 6 7 8 9
Operations
Contact load in amperes

4
Operating instructions
Fail-safe delay timer / Standstill monitor SRB-E-402FWS-TS
EN
2.6 Safety classification
2.6.1 Safety classification of semi-conductor output
Standards: EN ISO 13849-1, IEC 61508, EN 62061
PL: e
Category: 4
PFHD: ≤ 2.66 x 10-9 / h
PFDavg: ≤ 2.42 x 10-5
SIL: suitable for SIL 3 applications
Mission time: 20 years
2.6.2 Classification of relay output
Standards: EN ISO 13849-1, IEC 61508, EN 62061
PL: e
Category: 4
DC: high
CCF: > 65 points
PFHD: ≤ 1.25 x 10-8 / h
PFDavg: ≤ 5.3 x 10-5
SIL: suitable for SIL 3 applications
Mission time: 20 years
The PFH value of 1.25 × 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 % 880,000 0.6 min
40 % 330,000 1.6 min
60 % 110,000 5.0 min
80 % 44,000 12.0 min
100 % 17,600 30.0 min
3. Mounting
3.1 General mounting instructions
Mounting: snaps onto standard rails to EN 60715.
Hook bottom of enclosure in rail and push down until it engages 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
EN 60204-1.
Avoid laying proximity switch connection cables in areas
where strong interference signals are present (e.g. frequency
converters or cable leads from powerful electric motors);
the utilisation of shielded cables may be necessary.
Mount proximity switches / pulse generators mechanically
separated from each other (not on the same mounting angle).
The toothed wheel (encoder) must be mounted on the shaft
with a positive joint free of slip.
3.2 Dimensions
Device dimensions (H/W/D): 98 x 22.5 x 115 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.
If mains unit is a new installation or a replacement, the
connector of the output level must be removed and correct
connection of the power supply (A1) must be checked.
Settle length x of the conductor:
- on screw terminals: 7 mm
- on cage clamps of type s or f: 10 mm
XX
4.2 Coding of connecting terminals

5
SRB-E-402FWS-TS
Operating instructions
Fail-safe delay timer / Standstill monitor
EN
5. Operating principle and settings
5.1 Description of the terminals and LED indications
Pin Function LED Function
A1 Operating voltage
+ 24 VDC
RUN Operating voltage OK
RUN mode
flash code, see section
5.3
A2 Operating voltage
0 V
ERR Error code
refer to part 6
X2 Reset input
X3 Start input Q1/Q2
X4 Start guard system
X5 Feedbackloop
X7 Input additional
standstill signal
S11/S21
S31/S41
Test pulse outputs
S12
S22
Input channel 1
Input channel 2
In1/2 High level at S12/S22
flash code, see section 6
S32
S42
Input channel 1
Input channel 2
In3/4 High level at S32/S42
flash code, see section 6
Y1 Diagnostic output
Error code
flash code, see section 6
41/42 Signalling contact (NC)
Q1/Q2 Safety outputs
(standstill / time)
Out 1 Outputs activated
flash code, see section 6
13/14
23/34
Safety contacts
Guard system
Out 2 Outputs activated
flash code, see section 6
Standstill monitoring function with pulse generator
-10 %
1
2
(f)
(t)
Cut-off
frequency
➀"Standstill"
➁"Rotary movement"
Standstill monitoring function with pulse generator and
standstill signal
2
12
2
(f)
(t)
<600s
<5s
<5s
<5s
Cut-off
frequency
➀Standstill signal = 1, max. lag 600s
➁Difference monitoring max. 5s permitted
Standstill signal = 1
Standstill signal = 0
Fail-safe delay timer function
<5s
1
0
1
1
IN1
IN2
Out
0
0
t Pull-in delay
t < t Pull-in delay
t Pull-in delay t Pull-in delay t Pull-in delay
5
2
S11S12 S21S22
A1A2X3X2
Q2Q1X7Y1
SRB-E-402FWS-TS
24231413
Out 2
f / t
RUN
ERR
ln 1/2
ln 3/4
Out 1
mode
4241X5X4
S31S32 S41S42
Adjustment of application using rotary “mode” switch
• Open front transparent cover (see fig.).
• Opening is carried out by lifting side with lock.
• Select desired application using rotary mode switch (1 … 15) by
turning up or down (see 5.3).
• Set pull-in delay or cut-off frequency by turning the f/t rotary switch up
or down (see 5.3).
• After performing setting, close front cover again.
• The front cover can be secured with a seal for protection against
unintentional opening
Only touch the components after electrical discharge!

6
Operating instructions
Fail-safe delay timer / Standstill monitor SRB-E-402FWS-TS
EN
5.2 Adjustable applications
Adjustable applications standstill monitoring / safety guard monitoring:
Rotary switch (mode) Rotary knob f / t
Safety guard monitoring configuration FWS
Pos. Start / Reset
monitoring
Cross-wire
monitoring
Contact con-
figuration (without
synchronism)
Configuration
timebase
Pos. Cut-off frequency
(Hz)
1Yes Yes NC / NC 2 sensors 10.5
2Yes No NC / NC 2 sensors 21
3Autostart Yes NC / NC 2 sensors 32
4Autostart No NC / NC 2 sensors 43
5Yes Yes NC / NC Sensor + standstill signal 54
6Yes No NC / NC Sensor + standstill signal 65
7Autostart No NC / NC Sensor + standstill signal 78
C Configuration mode 8 10
Adjustable applications delay timer / safety guard monitoring:
Rotary switch (mode) Rotary knob f / t
Safety guard monitoring configuration TS Pull-in delay (s)
Pos. Start / Reset
monitoring
Cross-wire
monitoring
Contact con-
figuration (without
synchronism)
Configuration
timebase
Pos. Time 1 Time 2
8Yes Yes NC / NC Time 1 10.5 50
9Yes No NC / NC Time 1 21 60
10 Autostart Yes NC / NC Time 1 31.5 70
11 Autostart No NC / NC Time 1 42 80
12 Yes Yes NC / NC Time 2 52.5 100
13 Yes No NC / NC Time 2 63 120
14 Autostart Yes NC / NC Time 2 74 150
15 Autostart No NC / NC Time 2 85 180
C Configuration mode 9 8.5 210
10 10 240
11 12 270
12 15 300
13 20 360
14 25 420
15 30 480
C40 600
5.3 Changing setting or application
Description / proce-
dure
Rotary (mode) switch Rotary knob
(f / t)
System response LED indications
RUN In 1 In 2 Out
Factory setting Position 5 1 Hz Ready for application - - - -
Switch operating
voltage on
Without connected sensors! Lights up - - -
Turn to position C Application is deleted Lights up Flashes Flashes Flashes
Setting cycle active Application is deleted - - - -
No valid application saved Flashes - - -
SRB-E ready for new applications
Select cut-off frequency
or pull-in delay
Set frequency /
time 1-C
Flashes - - -
Select application Select desired application (1-15).
(Time window for setting
procedure approx. 3 s)
New application will be loaded Lights up - - -
Setting cycle active
Lights up Lights up - -
Lights up Lights up Lights up -
Lights up Lights up Lights up Lights up
Ready for operation The desired application is
configured
Adopt new application Lights up - - -
Switch off operating voltage and connect wires according to selected application -> SRB-E... ready for operation

7
SRB-E-402FWS-TS
Operating instructions
Fail-safe delay timer / Standstill monitor
EN
6. Diagnostic
6.1 LED indications
LED Function Display type
RUN Ready for operation Continuously lit
Not a valid application Flashes
In 1/2
Signal on input S12/S22 Continuously lit
Time window for synchronicity exceeded Flashes quickly
1-channel opening Flashes slowly
In 3/4 Input S32 and S42 closed Continuously lit
1-channel opening Flashes slowly
Out 1
Standstill / time elapsed Continuously lit
Standstill / time elapsed,
input X3 open
Flashes quickly
Out 2
Safety contacts ON Continuously lit
Safety outputs waiting for start
(input X4)
Flashes slowly
Feedback circuit not closed (input X5) Flashes slowly
In 1/2
Out 1
Switch-on delay active Alternate flashing
Single flashing of all LEDs with mains on
6.2 Malfunctions
Malfunctions and fault causes are displayed with the ERR-LEDs via
short and long flashing signals
LED +
Output
Error cause Long
flash
Short
flash
ERR
Y1
Operating voltage too low 1 1
Operating voltage too high 1 2
Invalid rotary switch setting 1 3
External voltage on output Q1 1 5, 7, 9
External voltage on output Q2 1 6, 8
2 1
Termination to GND on output Q1 2 2
Termination to GND on
output Q2 2 3
Cross-wire between inputs
S12 and S22 2 4
Cross-wire between inputs
S32 and S42 2 5
Undefined level on
X2 3 4
X3 3 5
X7 3 9
S12 2 9
S22 3 1
S32 3 2
S42 3 3
Rotary switch > 30 s to position C 6 8
Application changed and
activation of operating voltage
LEDs flash quickly:
RUN, In 1/2, In 3/4,
Out 1, Out 2
Application was changed during
active operation
LEDs flash quickly:
In 1/2, In 3/4, Out 1,
Out 2
Other fault codes: Consult technical sales dept. at
Schmersal
6.3 Warnings standstill monitoring function
Warning messages are indicated by means of short and long flashes on
the ERR LED.
LED +
Output
Error cause Long
flash
Short
flash
ERR
Y1
Frequency deviation between
the two channels ( > 20%) 4 4
Maximum frequency (6 KHz)
reached 4 5
Limit dropped below,
low signal on input S12
and S22 (see 10.1)
4 6
Standstill signal static or sensor
faulty 4 7
Input X2, delete warning messages
All warning messages that have occurred due to asynchronous signals
can be cleared by pressing the Reset button.

8
Operating instructions
Fail-safe delay timer / Standstill monitor SRB-E-402FWS-TS
EN
7. Wiring examples
7.1 Application example fail-safe delay timer
Two-channel operation with Start function
e.g.
interlocking
device
K1
K2
Power
X7
X3
A1 S22
Safety
Inputs
S11
A2
S21 X2
Q1 Q2Y1
Safety
Outputs
Signalling
Outputs
S12
Clock
Outputs
KA
KB
S42S31S41 S32
Safety
Inputs
Clock
Outputs
Processing
K1 K2
RKA
KB
H2
X5
X4 2313 41
2414 42
KAKB
N
L1+24 VDC
0 VDC
S3
S1
S2
Key
S1/S2: Safety input contacts
S3: Start button
a) Safety inputs
b) Safety outputs
c) Signalling outputs
d) Clock outputs
e) Processing
f ) Power
Function description of actuation:
• Upon actuation of inputs S12 and S22 (closing of contacts S1 and S2) the set activation delay timer is started.
• If the contacts S1 or S2 are opened and closed again before the time has elapsed, the time is restarted.
• Once the period has elapsed, the safety outputs with input X3 can be activated.
• If the safety outputs are to be activated automatically when the time has elapsed, input X3 must be switched to + 24 VDC.
Function description of safety outputs:
• It is possible for e.g. a safety guard to be operated with the two delayed safety outputs Q1 / Q2.
Application example with safety guard monitoring
• Two-channel operation of safety guard monitoring with two position switches where one has a positive break contact; with external reset button
• Power level: two-channel operation, suitable for increasing the capacity or number of contacts by means of contactors or relays with positive
action contacts and feedback circuit
Signalling outputs must not be used in safety circuits.

9
SRB-E-402FWS-TS
Operating instructions
Fail-safe delay timer / Standstill monitor
EN
7.2 Application examples safe standstill monitoring
Two-channel operation with level monitoring and Start function
Power
X7
X3
A1 S22
Safety
Inputs
S11
A2
S21 X2
Q1 Q2Y1
Safety
Outputs
Signalling
Outputs
S12
Clock
Outputs
KA
KB
S42S31S41 S32
Safety
Inputs
Clock
Outputs
Processing
K1 K2
RKA
KB
H2
X5
X4
K2
K1
2313 41
2414 42
KAKB
N
L1
M
+24 VDC
0 VDC
S3S2
e.g.
interlocking
device
Key
S1: Additional standstill signal
S2: Reset button
(delete warning messages)
S3: Start button
a) Safety inputs
b) Safety outputs
c) Signalling outputs
d) Clock outputs
e) Processing
f ) Power
Function description with level monitoring:
• The inputs S12 and S22 monitor the pulses from the sensors connected and compare them with the cut-off frequency set.
• The frequencies from the two sensors are continuously compared. A difference > 20% is detected as an error!
• After dropping below the cut-off frequency the safety output can be activated using input X3.
• If the safety outputs are to be activated automatically, the input X3 must be connected to + 24 VDC.
Two-channel operation with additional standstill signal and Start function
K1
K2
Power
X7
X3
A1 S22
Safety
Inputs
S11
A2
S21 X2
Q1 Q2Y1
Safety
Output`s
Signalling
Outputs
S12
Clock
Outputs
KA
KB
S42S31S41 S32
Safety
Inputs
Clock
Outputs
Processing
K1 K2
RKA
KB
H2
X5
X4 2313 41
2414 42
KAKB
N
L1
+24 VD
C
0 VDC
S3S2
M
S1
e.g.
interlocking
device
Key
S1: Additional standstill signal
S2: Reset button
(delete warning messages)
S3: Start button
a) Safety inputs
b) Safety outputs
c) Signalling outputs
d) Clock outputs
e) Processing
f ) Power
Function description with additional standstill signal:
• The inputs S12 and S22 monitor the pulses from the sensor connected and compare them to the cut-off frequency set.
• The input X7 monitors the standstill signal function as a function of the frequency from the sensor. A difference > 5 s is detected as an error!
• After dropping below the cut-off frequency and standstill signal (= 1), the safety outputs can be activated using input X3.
• If the safety outputs are to be activated automatically, the input X3 must be connected to + 24 VDC.
Function description of safety outputs:
• It is possible to operate, e.g. a safety guard using the two safety outputs Q1 / Q2.
Application examples with safety guard monitoring
• Two-channel operation, shown for safety guard monitoring with two position switches where one has a positive beak contact; with external
Reset button
• Power level: two-channel operation, suitable for increasing the capacity or number of contacts by means of contactors or relays
with positive action contacts and feedback circuit

10
Operating instructions
Fail-safe delay timer / Standstill monitor SRB-E-402FWS-TS
EN
7.3 Start configuration, time monitoring / standstill monitoring
7.3.1 Start/Autostart
• The safety outputs can be activated after the switch-on delay has
elapsed or the cut-off frequency has been dropped below.
• With autostart, X3 must be bridged to S11, S21 or +24 VDC
X3
S11/S21/+24 VDC
X3
S11/S21/+24 VDC
7.3.2 Reset warning message
• All warning messages that have occurred due to asynchronous signals
can be deleted by pressing the Reset button. The reset function is
triggered on releasing the button.
X2
S11/S21/+24 VDC
7.4 Start configuration safety guard monitoring
7.4.1 External reset button
• Manual start or activation of the module occurs when the button is
released.
Monitoring of max. actuation time 0.03 s … 3 s.
If the time is exceeded, the module cannot be started!
7.4.2 Reset without monitoring / autostart
• The manual start or the activation of the module occurs when the
button is pressed (not when it is released!).
• With autostart, X4 must be bridged to S31, S41 or +24 VDC
Not admitted without additional measure due to the risk of
gaining access by stepping behind!
Within the meaning of EN 60204-1 paragraph 9.2.3.4.2
the operating mode "automatic start" is only restrictedly
admissible. In particular, any inadvertent restart of the
machine must be prevented by other suitable measures.
X4
J
S31/S41/+24 VDC
Reset button (detection of the
trailing edge)
Reset without monitoring /
autostart
Rotary knob position
1, 2, 5, 6, 8, 9, 12, 13
Rotary knob position
3, 4, 7, 10, 11, 14, 15
7.4.3 Feedback circuit
• 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.
X5
S31/S41/+24 VDC
KD
KC
7.5 Sensor configuration
Single channel signal processing
(Category 1 – PL c to EN ISO 13849-1 possible.
S12 S22
S11/S21/+24 VDC
S12 S22
+24 VDC
S32 S42
S31/S41/+24 VDC
Rotary knob
position
Function
9, 11, 13, 15 Safety guard monitoring and time monitoring
Dual channel signal processing without cross-circuit monitoring
(Category 4 – PL e to EN ISO 13849-1 only possible with protective wiring)
S12 S22
S11/S21/+24 VDC
S32 S42
S31 S41
+24 VDC
S32 S42
S32 S42
+24 V+24 V
Rotary knob
position
Function
9, 11, 13, 15 Safety guard monitoring and time monitoring
(S12/S22 < 5s)
Dual channel signal processing with cross-circuit monitoring
(Category 4 – PL e to EN ISO 13849-1 possible)
S32 S42
S31 S41
Rotary knob
position
Function
1, 3, 5, 8, 10, 12, 14 Safety guard monitoring

11
SRB-E-402FWS-TS
Operating instructions
Fail-safe delay timer / Standstill monitor
EN
Two-channel signal processing with standstill signal
(Category 3 – PL d to EN ISO 13849-1 possible)
X7
S11/S21/+24 VDC
S12 S22
+24 VDC
Rotary knob
position
Function
5, 6, 7 Standstill monitoring
Two-channel signal processing with level monitoring
(Lay wires to the pulse generators separately and with protection,
category 4 – PL e according to EN ISO 13849-1 can be achieved)
S12
+24 VDC
S22
+24 VDC
Rotary knob
position
Function
1, 2, 3, 4 Standstill monitoring
8. Set-up and maintenance
8.1 Commissioning
The safety relay module features protection class IP54 for installation in
a switch cabinet.
The safety relay module is delivered ready for operation.
8.2 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 sensor technology and
their influence on the safety-monitoring module and the downstream
actuators.
The safety relay module features self-test functions.
If a fault is detected, the system adopts a safe mode and leads, if
necessary, to undelayed deactivation of all safety outputs.
8.3 Behaviour in the case of faults
In the event of a fault the following procedure is recommended:
1. Identify faults according to flash codes from chapter 6.2.
2. Rectify the fault if it is described in the table.
3. Switch operating voltage off and on and erase fault mode.
If fault could not be rectified, please contact the manufacturer.
8.4 Setting report
This report regarding the setting of the device must be completed
accordingly by the customer and enclosed in the technical
documentation of the machine.
The setting report must be available whenever a safety check is performed.
Company:
The safety-monitoring module is used in the following machine:
Machine n° Machine type Module n°
Configured application (mode):
Set drop-out delay (t):
Cut-off frequency set (f):
Set on (date) Signature of the responsible person

12
Operating instructions
Fail-safe delay timer / Standstill monitor SRB-E-402FWS-TS
EN
8.5 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 EN ISO 13849-1) or SIL 3 with HFT (hardware
fault tolerance) = 1 (according to EN 62061);
• at least every 12 months for PL d with category 3
(according to EN ISO 13849-1) or SIL 2 with HFT (hardware
fault tolerance) = 1 (according to EN 62061).
Damaged or defective components must be replaced.
9. Disassembly and disposal
9.1 Disassembly
The safety control module is only to be removed in a de-energised
condition.
9.2 Disposal
The safety control module must be disposed of in an appropriate
manner in accordance with the national regulations and laws.
10. Appendix
10.1 Wiring/circuit information
Two-channel signal processing with level monitoring
The proximity switches must be attached at a disc cam such at least
one proximity switch is always actuated.
This can be realised by a minimum 1:1 division of the disc cam. When
the proximity switches are correctly installed, the following unique
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 cam
has a 2:1 division (or higher).
Example cam
Proximity switches / pulse generators
Use PNP-switching sensors with normally open function.

13
EN
SRB-E-402FWS-TS-E-EN
SRB-E-402FWS-TS
Operating instructions
Fail-safe delay timer / Standstill monitor
11. EU Declaration of conformity
The currently valid declaration of conformity can be
downloaded from the internet at products.schmersal.com.
Place and date of issue: Wuppertal, March 14, 2023
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.
Name of the component: SRB-E-402FWS-TS
Type: See ordering code
Description of the component: Fail-safe delay timer, fail-safe standstill monitor and
safety guard monitoring
Relevant Directives: Machinery Directive
EMC-Directive
RoHS-Directive
2006/42/EC
2014/30/EU
2011/65/EU
Applied standards: EN ISO 13849-1:2015
EN ISO 13849-2:2012
IEC 61508 parts 1-7:2010
EN 62061:2005 + Cor.:2010 + A1:2013 + A2:2015
Notied body, which approved the full
quality assurance system, referred to in
Appendix X, 2006/42/EC:
TÜV Rheinland Industrie Service GmbH
Am Grauen Stein, 51105 Köln
ID n°: 0035
Person authorised for the compilation
of the technical documentation:
Oliver Wacker
Möddinghofe 30
42279 Wuppertal

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