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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 compon-
ents.
The safety relay 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 effecti-
veness of the safety system by trained individuals. Siemens AG, its subsidiaries
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 SIE-
MENS.
Siemens accepts no liability for any recommendation that may be implied or
stated 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
warranties or modify existing ones.
Application
The 3TK2840 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. for moving
covers and protective doors. Safety catetory 3 according to DIN EN 954-1 or SIL2
according to IEC 61508 can be achieved, depending on the external circuit ele-
ments.
Functional description and instructions for connection
The 3TK2840 safety relay has two solid-state outputs. Three LEDs indicate the
operating state and the function.
During operation, all internal circuit elements are cyclically monitored for faults.
Connect the EMERGENCY STOP button and the position switch to terminals Y11,
Y12 or Y21, Y22. Connect the ON button in series with the NC contacts of the
external actuators (feedback circuit) to terminals Y33, Y34 .
The 3TK2840 safety relay and the activated contactors K1 and K2 must have the
same frame potential.
Safety category 3 to EN 954-1 is achieved only in combination with 2 external
actuators with positively driven feedback contacts.
Use a power pack to IEC 60536 safety class III (SELV or PELV)
for power supply!
Terminal
Operating
A1
assignments
voltage
A2
Y11, Y12
Y21, Y22
Sensors
Y20
Y33, Y34
Outputs 14, 24
2
Cable lengths for 2 x 1.5 mm
Figures Fig. I:
Dimension drawings (dimensions in mm)
Fig. Ia: Terminal designation
Fig. II: Installation/Connection
Fig. III: Internal circuit: ¿ power pack, À control logic,
Á Output 1, Â Output 2
Fig. IV: Two-channel autostart for protective door monitoring,
category 3/SIL2
Fig. V: EMERGENCY STOP, two-channel, with monitored start,
category 3/SIL2
2
L+
M
Channel 1 EMERGENCY STOP or
position switch
Channel 2 EMERGENCY STOP or
position switch
Changeover contact, single-channel
ON button, feedback circuit
Solid-state outputs
max. 2000 m (total cable length for sensors)
Order No.: 3ZX1012-0TK28-4BA1
Figures Fig. VI: EMERGENCY STOP, single-channel, with monitored start,
category 2/SIL1*
Fig. VII: Single-channel autostart for protective door monitoring,
category 2/SIL1*
*) 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
Faults
• Defect in electronics
• Crossover in EMERGENCY STOP
Technical data
Permissible ambient temperature T
Operation/storage
Degree of protection to EN 60 529
Rated insulation voltage U
i
Rated impulse withstand voltage U
Rated control supply voltage U
s
Rated power
Operating range
Shock resistance (half-sine) as per IEC 60068 8 g/10 ms
Weight
Recovery time after EMERGENCY STOP
Release time after EMERGENCY STOP
Pickup time, monitored start
Pickup time, autostart
Release time after power failure
Short-circuit protection
Utilization category
Rated operational
as per IEC 60947-5-1
voltage U
(02.00)
(V)
DC-13
24
For further data and accessories see Catalog.
3TK2840
DIN EN 60 947-5-1 (08.00)
English
EMERGENCY
ON
STOP
not
activated
activated
not
activated
activated
not
not
activated
activated
circuit
No supply voltage
u
–25 to +60 °C / –40 to +80 °C
IP40, IP20 at terminals
50 V
500 V
imp
24 V DC
1.5 W
0.9 to 1.15 x U
s
150 g
min. 20 ms
< 30 ms
< 125 ms
< 250 ms
< 25 ms
no fusing necessary!
Rated operational current I
per output
e
(A)
60 °C
0.5
Outputs
on
off
off
off
e
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