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SIRIUS
Safety Relay
Operating Instructions
Read and understand these instructions before installing, operating, or
maintaining the equipment.
!
DANGER
Hazardous voltage.
Will cause death or serious injury.
Disconnect power before working
on equipment.
Reliable functioning of the equipment is only ensured with certified
components.
The safety switching device must be installed in switchgear cubicles
complying with degree of protection IP32, IP43 or IP54, depending on the
prevailing environmental conditions.
IMPORTANT NOTICE
The products described herein are designed to be components of a customized
machinery safety-oriented control system. A complete safety-oriented system
may include safety sensors, evaluators, actuators and signaling components. It
is the responsibility of each company to conduct its own evalution of the effec-
tiveness of the safety system by trained individuals. Siemens AG, its subsidia-
ries and affiliates (collectively "Siemens") are not in a position to evaluate all of
the characteristics of a given system or product or machine not designed by
SIEMENS.
Siemens accepts no liability for any recommendation that may be implied or sta-
ted herein. The warranty contained in the contract of sale by Siemens is the sole
warranty of Siemens. Any statements contained herein do not create new war-
ranties or modify existing ones.
Application
The 3TK2841 safety relay can be used in EMERGENCY STOP devices according
to EN 418 and in safety circuits according to EN 60 204-1 (11.98), e.g. in
movable guards and protective doors or in non-contact protective devices in
accordance with IEC 61496-1 (06.98), electrical equipment for furnaces in accor-
dance with DIN VDE 0116 (10.98) and automatic firing systems for gas burners
in accordance with DIN EN 298 (02.94). Depending on the external circuit ele-
ments, safety category 4 according to DIN EN 954-1 or SIL 3 according to
IEC 61508 can be achieved.
Functional description and instructions for connection
The 3TK2841 safety relay has two reliable solid-state outputs. Three LEDs indi-
cate the operating state and the function.
When the device is put into operation it runs through a self-test to test the
correct functioning of the internal electronics. All internal circuit components
are monitored for faults cyclically during operation.
Connect the EMERGENCY STOP button and/or the position switches or light
arrays to terminals Y11, Y12 and Y21, Y22. Connect the ON button in series with
the NC contacts of the external actuators to the supply voltage L+ (24 V DC) and
to terminal Y34. Connect cascading input 1 either via a safe output or directly to
the supply voltage L+ (24 V DC).
External actuators or loads can be switched via safe outputs 14, 24. It must be
ensured that the actuators or loads and the 3TK2841 electronic safety relay have
the same frame potential. Paralleling outputs 14 and 24 to increase the load cur-
rent is not permissible.
If electronic sensors (light-array monitoring, etc.) are used, and in single-channel
operation, Y35 must be connected to L+ (24 V DC). For autostart operation, Y32
must be connected directly to L+ (24 V DC) and Y34 must be connected to it via
NC contacts of the external actuators.
Use a power pack to IEC 60536 safety class III (SELV or PELV)
for power supply!
Terminal
Operating
A1
assignments
voltage
A2
Sensors Y11, Y12
Y21, Y22
Y35
Y32
Y34
Input
1
Outputs 14, 24
2
Cable lengths for 2 x 1.5 mm
2
L+
M
Channel 1 EMERGENCY STOP or position switch
Channel 2 EMERGENCY STOP or position switch
With / without cross-circuit detection
Autostart changeover switch
ON button, feedback circuit
Cascading input
Safe Solid-state outputs
max. 2000 m (total cable length for sensors)
Order No.: 3ZX1012-0TK28-1JA1
Figures
Fig. I:
Dimension drawings (dimensions in mm)
Fig. II:
Installation/Connection
Internal circuit: ¿ power pack, À control logic, Á Output 1, Â Output 2
Fig. III:
Fig. IV:
Protective-door monitoring, two-channel, autostart category 4 to EN 954-1
Fig. V:
EMERGENCY STOP, single-channel, monitored start category 2 to EN 954-1*
Fig. VI:
EMERGENCY STOP, two-channel, monitored start, category 4 to EN 954-1
Fig. VII:
Light-array monitoring, two-channel, autostart category 4 to EN 954-1
Fig. VIII:
EMERGENCY STOP, two-channel, monitored start and protective-door
monitoring, autostart category 4 to EN 954-1
Fig. IX:
Safety mat, two-channel, autostart category 3 to EN 954-1
*) This wiring example only satisfies category 2 according to EN 954-1 if a warning is
automatically generated when the actuator fails or the machine control initiates a safe state.
Otherwise an alternative shut-down method is required.
Operating states
LEDs
Operation
POWER RUN
FAULT
PS
ON
on startup self-test approx. 7 sec.
flashes
Faults
• Defect in electronics
flashes
• Change in terminal assignment
• Short-circuit to 24V
No supply voltage
Technical data
Permissible ambient temperature T
u
Operation/storage
Degree of protection to EN 60 529
Rated insulation voltage
Rated impulse withstand voltage
Rated control supply voltage
Rated power
Operating range
Shock resistance (half-sine) as per IEC 60068
Weight
Recovery time after EMERGENCY STOP
Recovery time after power failure
Release time after EMERGENCY STOP
Pickup time
Short-circuit protection
3)
Dark time
Start signal Y34
Utilization category
Rated operational vol-
as per IEC 60947-5-1
tage
DC-13
24 V
1)
Sensor circuits open; Cross-circuit between the sensors; Short-circuit of sensors
to frame
2)
only when using circuit variant with "cross-circuit detection"
3)
Safe outputs disconnected for test purposes; sufficiently slow actuators are
not affected.
For further data and accessories see Catalog.
3TK2841
DIN EN 60 947-5-1 (08.00)
English
EMERGENCY
ON button
STOP
not activated activated
1)
activated
not activated off
not activated not activated off
during operation
2)
–25 to +60 °C/–40 to +80 °C
IP40, IP20 at terminals
50 V
500 V
24 V DC
1.3 W
0.9 to 1.15 x U
s
8 g/10 ms
150 g
min. 200 ms
7 s
30 ms
max. 40 ms
no fusing necessary!
< 1 ms
pulse (min.200 ms / max. 5 s)
Rated operational current
per output
2.0 A
Outputs
on
off
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