Safety Relay
3TK2825
DIN EN 60947-5-1 (08.00)
Operating Instructions Order No.: 3ZX1012-0TK28-4CA1
English
2
Read and understand these instructions before installing, operating, or maintaining
the equipment.
The safety relay must be installed in switchgear cubicles complying
with degree of protection IP32, IP43 or IP54, depending on the prevailing
environmental 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 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.
You can use the safety relay 3TK2825 in emergency tripping devices as per
EN 418, and in safety circuits as per VDE 0113 Part1 (06.93) or EN 60 204-1
(11.98), e.g. with movable covers and guard doors.
Depending on the external connection, safety category 4 as per DIN EN 945-1 is
achievable with this device.
Safety relay 3TK2825 has three release circuits which are configured as NO cir-
cuits and two signaling circuits configured as an NC circuit. Three LEDs indicate
operating state and function.
When the EMERGENCY OFF pushbutton or position switch is enabled and the
ON pushbutton is operated, the internal redundant safety relays, electronic
circuitry and external contactors are tested for proper functioning.
On the 3TK2825, 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 tripping
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.
Reliable functioning of the equipment is only ensured with certified compon-
ents.
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/
–
Only connect the PE terminal if ground fault
monitoring is required.
PE
Observe notes on
connection!
Fig. VIII
Output 13, 14
23, 24
33, 34
Release circuit 1 (NO)
Release circuit 2 (NO)
Release circuit 3 (NO)
41, 42
51, 52
Signaling circuit 1 (NC)
Signaling circuit 2 (NC)
Function Monitored
start
Monitored start/
Autostart
Autostart
1-channel ON
pushbutton at
Y33, Y34
Jumper from Y11 to Y12
Jumper from Y21 to Y22
EMERGENCY OFF circuit at
Y10, Y11
Jumper or
feedback circuit
from Y33 to Y34
and jumper from
Y43 to Y44
2-channel Jumper from Y10 to Y11
EMERGENCY OFF circuits at
Y11, Y12 and Y21, Y22
Cable lengths for 2 x 1.5 mm
2
max. 2000 m (total cable length for sensors)
Figures
Fig. I / II: Dimension drawings (dimensions in mm) / Installation
Fig. III: Internal circuit: ¿ power pack, À PTC fuse, Á control logic,
 Channel 1, à Channel 2
Autostart for guard door monitoring:
Fig. IV: Safety category
2 *
Fig. V: Safety category
4
!
Monitored start for emergency tripping:
Fig. VI: Safety category
2 *
Fig. VII: Safety category
4
*) 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 Channel 1 Channel 2 PS Emergency
trip
ON Release
circuits
ON not activated activated closed
activated not activated open
not activated not activated open
Faults
• Relay fusion-welded
• Motor contactor fusion-welded
• Defect in electronics
• Short-circuit in ON circuit
open
Cross or ground faults in emergency
trip circuit (min. fault current I
Kmin
=
0.5 A; PTC fuse trips)
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
4 kV
Rated control supply voltage U
s
24 V DC, 24 V AC, 115 V AC, 230 V AC
Rated power 3 W
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 460 g
Recovery time after EMERGENCY STOP min. 200 ms
Release time after EMERGENCY STOP max. 25 ms
Pickup time, Monitored start max. 25 ms
Pickup time, Autostart max. 150 ms
Utilization
category
as per
IEC 60947-5-1
Rated operational
voltage U
e
(V)
Rated operational current I
e
with all release circuits loaded
(A)
60 °C 70 °C
AC-15 230 6 4
DC-13 24 6 4
115 0.2 0.2
230 0.1 0.1
Continuous current I
th
64
Short-circuit protection for
signal circuit and enable circuit
Fuse links DIAZED
Duty class gL(gG)
quick response
6 A
10 A
The safety relay is protected by an internal self-healing PTC fuse (multifuse).
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