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Load feeder with integrated
safety technology
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 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 customi-
zed 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 effectiveness 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 machine 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 3RA710. load feeders with integrated safety technology can be used in
EMERGENCY STOP devices in accordance with EN 418 and in safety circuits
in accordance with EN 60 204-1 (11.98), for example for mobile guards or
protective doors. Safety category 3 in accordance with DIN EN 954-1 or
SIL2 in accordance with IEC 61508 is stipulated, depending on the external
connections.
Functions and connections
The 3RA7101 and 3RA7102 safe load feeders consist of an adapter for rail
mounting with integrated safety-oriented electronics, a circuit-breaker and
two series-connected contactors.
This combination forms a complete load feeder, wired and certified in the
factory, which complies with type of coordination 1 or 2.
The 3RA7100 load feeders without a circuit-breaker are used for separate
or fused mounting.
The operating status is indicated by means of three LEDs on the front plate.
Please refer to the typical applications shown in Figs. IV to VII for the exter-
nal connections of the load feeders.
All internal circuit components are monitored for faults cyclically during
operation.
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
Outputs
Cable lengths
for 2 x 1.5 mm
Line capacitance
2
L/+
N/
–
Channel 1 EMERGENCY STOP or position
switch
Channel 2 EMERGENCY STOP or position
switch
Changeover contact, single-channel
ON button, autostart
Contactor contacts L1/T1, L2/T2, L3/T3
2
max. 2000 m (total length for sensors)
max. 0.5 µF to M (sensors)
Order No.: 3ZX1012-0RA70-0AA1
Figures
Fig.I / II: Dimension drawings (dimensions in mm)
Internal connections: ¿ power supply unit, À control logic, Á
Fig. III:
contactor driver, Â power section
Fig. IV:
Two-channel autostart for monitoring protective door
Category 3 acc. to EN 954-1, SIL2 acc. to IEC 61508-2
Fig. V:
Single-channel autostart for monitoring protective door
Category 2 acc. to EN 954-1, SIL1 acc. to IEC 61508-2
Fig. VI:
Two-channel EMERGENCY STOP with additional ON button
Category 3 acc. to EN 954-1, SIL2 acc. to IEC 61508-2
Fig. VII:
Single-channel EMERGENCY STOP with additional ON button
Category 2 acc. to EN 954-1, SIL1 acc. to IEC 61508-2
Fig. VIII: Main circuit connections
Operating states
LEDs
Operation
EMERGENCY
POWER RUN FAULT
STOP
Not
actuated
Actuated
Not actuated Not
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
1)
Rated power
Operating range
Shock resistance (half-sine) as per IEC 60068
2)
Weight
Recovery time
3)
Release time (EMERGENCY STOP)
3)
Release time (power failure)
4)
Response time
Technical data / main circuit
Depends on the power section
1) Only safety electronics, power loss of the power section must be added.
2) Depends on the power section.
3) Opening delay of the contactors must be added.
4) Closing delay of the contactors must be added.
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.
3RA710.
IEC 60 439-1 (08.00)
English
ON button
Outputs Cause
Actuated
on
Normal operation
once
No
off
EMERGENCY STOP
function
(protective door)
actuated
off
Contactors
actuated
deenergized;
Press ON button to
start
off
If EMERGENCY STOP
is not actuated, device
is defective
off
u
20 to +60 °C /
40 to +80 °C
–
–
IP20
690 V
6 kV
imp
DC 24V, AC 115V, AC 230V
2 W
0.9 to 1.1 x U
with DC 24 V
s
0.85 to 1.1 x U
with AC control
s
5 g/11 ms
max. 1.2 kg
typ. 20 ms
typ. 20 ms
max. 100 ms
max. 250 ms
MTTR
t
proof
8
10
100
10
8
10
100
10
[a]
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