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SIRIUS
Safety Relay
Operating Instructions
Read and understand these instructions before installing, operating, or maintai-
ning 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 devices must be installed in a switchgear cabinet with the IP32,
IP43 or IP54 degree of protection, depending on the ambient 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 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.
Application
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.
Functions and connections
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.
Terminal
Operating voltage A1
assignments
The PE terminal should only be
connected if ground fault monitoring is
required.
Output
Function
3TK2827
1-channel
ON pushbutton
at Y33, 34
2-channel
2
Cable lengths
for 2 x 1.5 mm
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
2
L/+
A2
N/–
Follow connection notes
PE
given in Fig. VIII!
13, 14
Release circuit 1, instantaneous
23, 24
Release circuit 2, instantaneous
31, 32
Signal circuit, instantaneous
47, 48
Release circuit 1, delayed (t)
57, 58
Release circuit 2, delayed (t)
3TK2827 / 3TK2828
3TK2828
Jumper from Y11 to Y12
Feedback circuit
Jumper from Y21 to Y22
or Jumper to
EMERGENCY STOP circuits
Y33, Y34.
at Y10, Y11
Jumper from Y10 to Y11
EMERGENCY STOP circuits
at Y11, Y12 and Y21, Y22
max. 1000 m (total length for sensors)
Order No.: 3ZX1012-0TK28-5CA1
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
POWER
Ch1
Ch2
Ch1
Ch2
(t)
(t)
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
AC/DC 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
Response time
Utilization category
Rated operational
voltage U
as per IEC 60947-5-1
e
(V)
AC-15
230
DC-13
24
115
230
Continuous current I
th
Short-circuit protection
Signal circuit and
Fuse links
release circuit
Duty class
Control supply voltage
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.
3TK2827, 3TK2828
DIN EN 60947-5-1 (08.00)
English
Operation
PS
EMERGENCY
ON
Release circuits
STOP
ON
not activated
activated closed
activated, delay
not
open
time elapsed
activated
not activated
not
open
activated
activated, delay
not
FK 1 & 2 open,
time elapsed
activated
FK 1 (t) & FK2 (t)
closed
Faults
• Relay fusion-welded
open
• Motor contactor fusion-welded
• Defect in electronics
• Short-circuit in ON circuit
Cross or ground faults in
EMER-GENCY STOP circuit (min.
fault current I
= 0.5 A; PTC fuse
Kmin
trips) or supply voltage missing.
u
25 to +60 °C/
40 to +80 °C
–
–
IP20
300 V
4 kV
imp
24 V DC, 24 V AC, 115 V AC, 230 V AC
3 W/4 VA
0.85 to 1.1 x U
s
0.580 kg
Restart only possible after this
time elapses!
0.05 to 3 s or 0.5 to 30 s adjustable
max. 80 ms
Rated operational current I
on loading of instantaneous / delayed
release circuits (A)
60 °C
70 °C
5/3
4/3
5/2
4/2
0.2/0.2
0.2/0.2
0.1/0.1
0.1/0.1
5/5
4/4
DIAZED
gL(gG) 6 A / quick response 10 A
gL(gG) 2 A
e
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