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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.
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
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
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.
Functions and connections
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.
Terminal assignments Operating
voltage
Only connect the PE terminal if ground fault
monitoring is required.
Output
Function
Monitored
start
1-channel
ON
pushbutton at
Y33, Y34
2-channel
2
Cable lengths
for 2 x 1.5 mm
Figures
Fig. I / II:
Dimension drawings (dimensions in mm) / Installation
Internal circuit: ¿ power pack, À PTC fuse, Á control logic,
Fig. III:
 Channel 1, à Channel 2
Autostart for guard door monitoring:
Fig. IV:
Safety category 2 *
Fig. V:
Safety category 4
2
A1
L/+
A2
N/
–
PE
Observe notes on
connection!
Fig. VIII
13, 14
Release circuit 1 (NO)
23, 24
Release circuit 2 (NO)
33, 34
Release circuit 3 (NO)
41, 42
Signaling circuit 1 (NC)
51, 52
Signaling circuit 2 (NC)
Monitored start/
Autostart
Autostart
Jumper from Y11 to Y12
Jumper or
Jumper from Y21 to Y22
feedback circuit
EMERGENCY OFF circuit at
from Y33 to Y34
Y10, Y11
and jumper from
Y43 to Y44
Jumper from Y10 to Y11
EMERGENCY OFF circuits at
Y11, Y12 and Y21, Y22
max. 2000 m (total cable length for sensors)
Order No.: 3ZX1012-0TK28-4CA1
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
POWER Channel 1 Channel 2 PS
Technical data
Permissible ambient temperature T
u
Operation/storage
Degree of protection to EN 60 529
Rated insulation voltage U
i
Rated impulse withstand voltage U
imp
Rated control supply voltage U
s
Rated power
AC/DC operating range
Shock resistance (half-sine) as per IEC 60068
Weight
Recovery time after EMERGENCY STOP
Release time after EMERGENCY STOP
Pickup time, Monitored start
Pickup time, Autostart
Utilization
Rated operational
category
voltage U
e
(V)
as per
IEC 60947-5-1
AC-15
230
DC-13
24
115
230
Continuous current I
th
Short-circuit protection for
signal circuit and enable circuit
The safety relay is protected by an internal self-healing PTC fuse (multifuse).
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.
3TK2825
DIN EN 60947-5-1 (08.00)
English
Operation
Emergency
ON
trip
ON
not activated activated
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
Cross or ground faults in emergency
trip circuit (min. fault current I
=
Kmin
0.5 A; PTC fuse trips)
25 to +60°C/
40 to +80°C
–
–
IP20
300 V
4 kV
24 V DC, 24 V AC, 115 V AC, 230 V AC
3 W
0.85 to 1.1 x U
s
8 g/10 ms
460 g
min. 200 ms
max. 25 ms
max. 25 ms
max. 150 ms
Rated operational current I
with all release circuits loaded
(A)
60 °C
70 °C
6
4
6
4
0.2
0.2
0.1
0.1
6
4
Fuse links
DIAZED
Duty class
gL(gG)
quick response
Release
circuits
closed
open
e
6 A
10 A
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