SIRIUS
Safety Relay
3TK2827, 3TK2828
DIN EN 60947-5-1 (08.00)
Operating Instructions Order No.: 3ZX1012-0TK28-5CA1
English
2
Read and understand these instructions before installing, operating, or maintai-
ning the equipment.
Reliable functioning of the equipment is only ensured with certified compon-
ents.
The devices must be installed in a switchgear cabinet with the IP32,
IP43 or IP54 degree of protection, depending on the ambient conditions.
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 machine 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.
You can use the safety relays 3TK2827/28 in EMERGENCY STOP devices as per
DIN EN 418, in safety circuits as per and/or EN 60 204-1 (11.98), such as for
monitoring safety guards, or in circuits with controlled standstill requirement
(STOP Category 1). Depending on the external circuitry, you can use this device
to install Safety Category 4 instantaneous release circuits and Safety Category 3
delayed release circuits according to DIN EN 954-1.
The 3TK2827/28 safety relays possess two delayed and two instantaneous
release circuits as NO circuits and one instantaneous signal circuit as NC circuit.
Five LEDs indicate the operating status and the functions.
The internal redundant safety relays, the electronics and the operated motor
contactors are tested for proper functioning when the EMERGENCY STOP button
or the limit switch button is unlatched, and when ON circuit Y33, Y34 is closed.
On the 3TK2827 (monitored start), the ON circuit Y33, Y34 is checked for short-
circuit. This means that a fault ist detected when Y33, Y34 is closed before the
EMERGENCY STOP button is closed.
Be sure to fit the specified fuses. Otherwise safe interruption in
the event of a fault cannot be guaranteed.
For further data and accessories see Catalog.
DANGER
Hazardous voltage.
Will cause death or serious injury.
Disconnect power before working
on equipment.
IMPORTANT NOTICE
Application
Functions and connections
Terminal
assignments
Operating voltage A1
A2
L/+
N/–
The PE terminal should only be
connected if ground fault monitoring is
required.
PE
Follow connection notes
given in Fig. VIII!
Output 13, 14
23, 24
31, 32
Release circuit 1, instantaneous
Release circuit 2, instantaneous
Signal circuit, instantaneous
47, 48
57, 58
Release circuit 1, delayed (t)
Release circuit 2, delayed (t)
Function 3TK2827 3TK2827 / 3TK2828 3TK2828
1-channel ON pushbutton
at Y33, 34
Jumper from Y11 to Y12
Jumper from Y21 to Y22
EMERGENCY STOP circuits
at Y10, Y11
Feedback circuit
or Jumper to
Y33, Y34.
2-channel Jumper from Y10 to Y11
EMERGENCY STOP circuits
at Y11, Y12 and Y21, Y22
Cable lengths for 2 x 1.5 mm
2
max. 1000 m (total length for sensors)
Figures
Fig. I: Dimension drawings (dimensions in mm)
Fig. II: Installation / Cage Clamp
Fig. III: Internal circuit: ¿ power pack, À PTC fuse, Á control logic,
 Channel 1, à Channel 2, Ä Channel 1 (t), Å Channel 2 (t)
3TK2827, Monitored start for EMERGENCY STOP
Fig. IV: Safety category
2*
Fig. V: Safety category
3
!
3TK2828, Autostart for Guard door monitoring
Fig. VI: Safety category
2*
Fig. VII: Safety category
3
*) 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.
Operation
LEDs Operation
POWER Ch1 Ch2 Ch1
(t)
Ch2
(t)
PS EMERGENCY
STOP
ON Release circuits
ON not activated activated closed
activated, delay
time elapsed
not
activated
open
not activated not
activated
open
activated, delay
time elapsed
not
activated
FK 1 & 2 open,
FK 1 (t) & FK2 (t)
closed
Faults
• Relay fusion-welded
• Motor contactor fusion-welded
• Defect in electronics
• Short-circuit in ON circuit
open
Cross or ground faults in
EMER-GENCY STOP circuit (min.
fault current I
Kmin
= 0.5 A; PTC fuse
trips) or supply voltage missing.
Technical data
Permissible ambient temperature T
u
Operation/storage –25 to +60 °C/–40 to +80 °C
Degree of protection to EN 60 529 IP20
Rated insulation voltage U
i
300 V
Rated impulse withstand voltage U
imp
4kV
Rated control supply voltage U
s
24 V DC, 24 V AC, 115 V AC, 230 V AC
Rated power 3 W/4 VA
AC/DC operating range 0.85 to 1.1 x U
s
Shock resistance (half-sine) as per IEC 60068 8 g/10 ms
Weight 0.580 kg
Recovery time after
EMERGENCY STOP
Restart only possible after this
time elapses!
Release time after EMERGENCY STOP 0.05 to 3 s or 0.5 to 30 s adjustable
Response time max. 80 ms
Utilization category
as per IEC 60947-5-1
Rated operational
voltage U
e
(V)
Rated operational current I
e
on loading of instantaneous / delayed
release circuits (A)
60 °C 70 °C
AC-15 230 5/3 4/3
DC-13 24 5/2 4/2
115 0.2/0.2 0.2/0.2
230 0.1/0.1 0.1/0.1
Continuous current I
th
5/5 4/4
Short-circuit protection
Signal circuit and
release circuit
Fuse links
Duty class
DIAZED
gL(gG) 6 A / quick response 10 A
Control supply voltage gL(gG) 2 A
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