Siemens 3TK2856 Betriebsanleitung Seite 2

Expansion units
Instructions
!
WARNING
HAZARDOUS VOLTAGE.
Can cause electrical shock
and burns.
Disconnect power before proceeding
with any work on this equipment.
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 evaluation of the effec-
tiveness of the safety system using trained individuals. Siemens AG, its subsid-
iaries and affiliates (collectively "Siemens") are not in a position to evaluate all
of the characteristics of a given machine or product 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 3TK2856/57 expansion unit can be used in conjunction with any
3TK28/3RA7 basic unit. It serves to expand the release circuits. Safety category
4 in accordance with DIN EN 954-1 or SIL3 in accordance with IEC 61508 can be
achieved, depending on the external connections.
Functions and connections
The 3TK2856/57 expansion unit has two contactor relays as switching elements,
a safe solid-state output, a safe input for cascading and an input for operational
switching.
The operating status and the function are indicated by means of three LEDs.
When the device is started up, it executes a self-test to check that the internal
electronics are functioning correctly. All internal circuit components are moni-
tored for faults cyclically during operation.
Additional expansion units, e.g. 3TK2830/56/57 or 3RA712/3/4, as well as
external actuators or loads can be connected via the safe output 2. This output
can also be used for cascading with the 3TK2841/42/45/53 and 3RA711 devices.
One-channel cascading is only allowed inside a switch cabinet for Cat. 3/4.
It is important to ensure that the actuator or load and the expansion unit
3TK2856/57 have the same frame potential.
Please refer to the typical applications shown in Figs. IV to VII for the external
connections of the safety combination.
Use a power pack to IEC 60536 safety class III (SELV or PELV)
for the power supply!
Terminal Operating voltage
assignments
Enable circuits
Inputs
Output
2
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 connections: ¿ power supply unit, À sensor evaluation,
Á driver for contactor relays, Â power section, Ã cascading input,
Ä terminals for operational switching, Å safe solid-state output
Fig. IV: 3TK2823 expanded with 3TK2856/57, two-channel EMERGENCY STOP with
additional ON button, Cat 4 / SIL 3
2
A1 L+
A2 M
see Fig. VIII
1 Cascading input
3 Supply for external switches
4 Input for operational switching
2 Safe solid-state output 24 V DC / 1 A
Max. 2000 m (total cable length for sensors)
Max. 4 µF to M (sensors)
Order No.: 3ZX1012-0TK28-1HA1
Fig. V: 3TK2841 expanded with 3TK2856/57, two-channel protective door
monitoring, autostart, Cat 4 / SIL 3
Fig. VI: 3TK2853 expanded with 3TK2856/57, two-channel EMERGENCY STOP with
additional ON button, Cat 4 / SIL 3
Fig. VII: a: Without operational switching
b: With floating contact operationally switched
c: With non-floating contact operationally switched
Fig. VIII: Release circuits
Operating states
LEDs Operation
POWER RUN FAULT EMERGENCY
STOP
Self-test approx. 7 sec. on startup
Closed
Open
Only for 3TK2857
Open
Flashes
Faults
• Electronic defect
Flashes • Contactor welded
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
Weight
Recovery time after EMERGENCY STOP
Recovery time after power failure
Release time after EMERGENCY STOP
Response time enable circuit
Response time output 2
Short-circuit protection enable circuit
Short-circuit protection A1
1)
Dark time
Process response time
Manual testing (intermittent operation)
Release time
Utilization category Rated operational
to IEC 60947-5-1 (02.00) voltage U
DC 13 24 V
1)
Safe outputs disconnected for test purposes; sufficiently slow actuators are not affected.
For further data and accessories see Catalog.
Reliable functioning of the equipment is only ensured with certified components.
3TK2856, 3TK2857
IEC 60 439-1 (08.00)
Operational Contactors Output
switching 2
Closed On
On
Open Off
— Off Off
— On Off
Off Off
u
25 to +60 °C / 40 to +80 °C
– –
IP20
690 V
6 kV
imp
24 V DC
8.5 W
0.9 to 1.1 x U
s
5 g/11 ms
750 g
typically 400 ms
7 s
<45 ms
max. 60 ms
max. 40 ms
10 A (utilization category gL/gK)
no short-circuit protection necessary
<1 ms
180 ms
6 months
0.05 to 3s; 0.5 to 30s or 5 to 300s
(fault detection from ± 30%)
Rated operational current per
output at 60 °C
e
10 A (auxiliary switch blocks 6 A)
English
Cause
Normal
operation
Contactors
deenergized
Open
EMERGENCY
STOP
Timeout