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Safety combination
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.
The switchgear 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
SIEMENS.
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 3TK285. safety combination can be used in emergency tripping devices
according to DIN 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 elements.
Functional description and instructions for connection
The 3TK285. electronic safety combination comprises two auxiliary contactors
as switching elements. Three LEDs indicate the operating state and the function.
During operation all the internal circuit parts are cyclically monitored for faults.
Connect the emergency stop button or the position switch to the terminals Y11,
Y12 and Y21, Y22.
The ON button is connected to Y34 and L+ (24 DC). In autostart mode the termi-
nals Y33, Y34 are jumpered. In single-channel mode Y20 and Y21 are jumpered.
Always use a power supply unit in accordance with
IEC 60536, safety class III (SELV or PELV) to supply power to
the electronic circuits of the 24 V DC devices!
Terminal
Operating
A1
assignments
voltage
A2
Sensors
Y11, Y12
Y21, Y22
Y20
Y33, Y34
Release circuits
Signalling circuits
Cable lengths
for 2 x 1.5 mm
Line capacitance
Figures
Fig. I:
Dimension drawings (dimensions in mm)
Fig. II:
Installation
Fig. IIa:
Connection
Fig. III:
Internal circuit: ¿ power pack, À sensor, Á driver for aux. contactors,
 aux. contactors
Fig. IV:
Two-channel autostart for monitoring protective door
Category 3 acc. to EN 954-1, SIL 2 acc. to IEC 61508-2
Fig. V:
Single-channel autostart for monitoring protective door
Category 2 acc. to EN 954-1, SIL 1 acc. to IEC 61508-2
2
L/+
N/
–
Channel 1 EMERGENCY STOP or
position switch
Channel 2 EMERGENCY STOP or
position switch
Changeover contact, single-channel
ON button, autostart
see Fig. VIII
see Fig. VIII
2
max. 2000 m (total length for sensors)
max. 0.5 µF to M (sensors)
3TK2850, 3TK2851, 3TK2852
Order No.: 3ZX1012-0TK28-1FA1
Fig. VI:
Two-channel EMERGENCY STOP with additional ON button
Category 3 acc. to EN 954-1, SIL 2 acc. to IEC 61508-2
Fig. VII:
Single-channel EMERGENCY STOP with additional ON button
Category 2 acc. to EN 954-1, SIL 1 acc. to IEC 61508-2
Fig. VIII:
Release circuits 3TK2850; 3TK2851; 3TK2852
Operating states
LEDs
Operation
EMERGENCY
POWER RUN FAULT
STOP
Not
actuated
Actuated
Not actuated Not actuated off
Faults
• Electronic defect
Crossover in EMER-
GENCY STOP circuit
No supply voltage
Technical data / auxiliary circuit
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
Weight
Recovery time after EMERGENCY STOP
Release time after power failure
Release time after EMERGENCY STOP
Pickup time, monitored start
Pickup time, autostart
Short-circuit protection
Technical data / release circuits
Utilization category
Rated operational
voltage U
as per
IEC 60947-5-1 (02.00)
DC-13
24 V
AC-15
230 V
Error probability according to IEC 61508
PFD
PFH [1/h]
-3
24 V DC
0.996 x 10
–
-3
1.27 x 10
–
-3
115/230 V AC
1.06 x 10
–
-3
1.33 x 10
–
For further data and accessories see Catalog.
Reliable functioning of the equipment is only ensured with certified
components.
IEC 60 439-1 (08.00)
ON button
Outputs Cause
Actuated
on
Normal operation
once
No
off
EMERGENCY STOP
function
(protective door)
actuated
Contactors
deenergized;
Press ON button to
start
off
If EMERGENCY STOP
is not actuated, device
is defective
u
25 to +60 °C/
40 to +80 °C
–
–
IP20
690 V
6 kV
imp
24V DC/24V AC/115V AC/230V AC
8.5 W
0.9 to 1.15 x U
at DC 24V
s
0.85 to 1.1 x U
at AC control
s
5 g/11 ms
max. 850 g
min. 20 ms
max.100 ms
<30 ms
<200 ms
<300 ms
10 A (utilization category gl/gG)
Rated operational current I
per output at 60 °C
e
10 A (aux. contact blocks 6 A)
6 A
t
proof
MTTR
10
8
10
100
10
8
10
100
10
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e
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