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Safety relay
RT6
Approvals:
TÜV Nord
Safety relay for:
Emergency stops
Light curtains
Three position devices
Interlocked gates/hatches
Magnetic switches
Light beams
Safety mats
Contact strips
Foot operated switches
Would you like a single safety relay for all your
safety applications?
Then choose the RT6 universal relay to supervise both your
safety devices and the internal safety of your machinery. In
addition you can select the safety level required for each installation. All this is possible because the RT6 has the most
versatile input option arrangement available on the market.
Many other relays can therefore be replaced by the RT6.
The relay also comes with other options such as manual
or automatic reset. Manual supervised reset can be used
for gates and other safety devices that can be bypassed.
Automatic reset can be used for small hatches, if deemed
acceptable from risk assessment.
The RT6 also has information outputs that follow the inputs
and outputs of the relay. These outputs will for example
indicate if a gate is open or closed and if the safety relay
needs to be reset.
The RT6 is designed with a minimum amount of
components thus keeping both production costs and
component acquisitions to a minimum.
Choose the RT6 to simplify your safety circuits and reduce
your costs.
Features:
Five input options
Single or dual channel input
Manual supervised or automatic reset
Test input for supervision of
external contactors
Width 45 mm
LED indication of supply,
inputs, outputs, short-circuit
and low voltage level.
3 NO/1 NC relay outputs
Two voltage free transistor
information outputs
Supply 24 VDC, 24, 48, 115
or 230 VAC
Quick release connector
blocks
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Technical information - RT6
Inputs
The inputs from the safety devices must be connected according
to one of the following options in order to fulfill the expected safety
level and to avoid unsafe situations.
Single channel, 1 NO contact from +24 V DC, 1. category 1,
up to PL c
Dual channel, 2 NO contacts from +24 V DC, 2. category 3,
up to PL d
Dual channel 1 NO, 1 NC contact from +24 V DC, 3.
category 4, up to PL e
Dual channel, 1 NO contact from 0V and 1 NO contact 4.
from +24 V DC, category 4, up to PL e
Safety mats/contact strips 1 ‘contact’ from 0V and 1 5.
‘contact’ from +24 V DC, category 3, up to PL d
When the input /inputs are activated and the test /super vised reset
is complete, relays 1 and 2 are energized. Simultaneous activation
is not required where there are dual channels. The two relays are
de-energized when the input/inputs are de-activated in accordance with the input option chosen or in case of a power failure.
Relays 1 and 2 must both be de-energized before the outputs can
be activated again.
Transistor output status information
The RT6 has two voltage free transistor outputs that can be connected to a PLC, computer or other monitoring device. These
outputs give the input and output status of the relay.
Indication of low voltage
The ‘On’ LED will flash if the relay supply voltage falls below an
acceptable level. This indication will also be given if a monitored
safety mat/contact strip is actuated. See connection option 5.
Safety level
The RT6 has internal dual and supervised safety functions. A
short-circuit, internal faulty component or external interference
will not present a risk to options with the highest safety level. A
manual reset requires that the reset input is closed and opened
before the safety relay outputs are activated. A short-circuit or a
faulty reset button is consequently supervised.
When the RT6 is configured for dual channel input, both the
inputs are supervised for correct sequence operation before the
unit can be reset.
The input options 3 and 4 have the highest safety levels as all
short-circuits and power failures are supervised. This in combination with internal current limitation makes the relay ideal for
supervision of safety mats and contact strips.
Regulations and standards
The RT6 is designed and approved in accordance with appropriate directives and standards. See technical data.
Connection examples
For examples of how our safety relays can solve various safety
problems, see the section “Connection examples”.
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Reset and testing
The RT6 has two reset options� manual and automatic. The ma-has two reset options� manual and automatic. The ma- two reset options� manual and automatic. The manual supervised reset is used when the RT6 is monitoring safety
devices that can be bypassed, i.e. to ensure that the outputs of the
safety relay do not close just because a gate is closed. The automatic reset should only be used if deemed an acceptable risk.
In addition, the RT6 can also test (supervise) whether, for example, contactors and valves etc are de-energized/de-activated
before a restart is allowed.
Connection of supply - RT6
DC supply
AC supply
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**Only for AC supply
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DC-supply of AC-units
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The RT6 DC option should be supplied
with +24 V on A1 and 0 V on A2.
The RT6 AC option should be supplied
with the appropriate supply voltage via
connections A1 and A2.
The S23/ must be connected to protective earth.
All AC-units can also be supplied by
+24 VDC to S53 (0VDC to S23).
NOTE!
With both DC and AC modules, if cable
shielding is used this must be connected
to an earth rail or an equivalent earth
point.
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Connection of safety devices - RT6
1. SINGLE CHANNEL, 1 NO from +24V
3. DUAL CHANNEL, 1 NO, 1 NC from
+24V
5. Safety mat/Contact strip
The input (contact to S14) must be closed
before the outputs can be activated. When
the input contact is opened the relay safety
output contacts open.
2. DUAL CHANNEL, 2 NO from +24V
Both input contacts (S14 and S34) must
be closed before the relay outputs can be
activated. The safety relay contacts will
open if one or both of the input contacts
are opened. Both the input contacts must
be opened and reclosed before the relay
can be reset. A short-circuit between inputs
S14 and S34 can only be supervised if the
device connected to the inputs has short-
circuit supervised outputs, e.g. JOKAB
Focus light curtains.
Reset connections - RT6
One input contact must be closed (S14) and
one opened (S44) before the relay outputs
can be activated. The safety relay contacts
will open if one or both of the inputs
change state or in case of a short-circuit
between S14 and S44. Both inputs must
return to their initial positions before the
relay outputs can be reactivated.
4. DUAL CHANNEL, 1 NO from +24V,
1 NO to 0V
Relay functions as for option 2, but a shortcircuit, in this case between inputs S14
and S24, is supervised (safety outputs
are opened).
Both ‘contact’ inputs from a inactivated
safety mat/contact strip must be made in
order to allow the RT6 relay outputs to be
activated. When the safety mat/contact
strip is activated or a short-circuit is detected
across S14-S23, the relay will de-energize
(safety outputs open) and the ‘ON’ LED
will flash. As output S13 has an internal
current limit of 70 mA, the RT6 will not be
overloaded when the mat/contact strip is
activated or a short-circuit is detected.
Manual supervised reset Automatic reset
*
*connected to S13 for safety mat/
contact strip
The manual supervised reset contact con-
nected to input X1 must be closed and
opened in order to activate the relay out-
puts.
Automatic reset is selected when S53,
X1 and X4 are linked. The relay outputs
are then activated at the same time as
the inputs.
Output connections - RT6
Relay outputs
The RT6 has three (3 NO) safety outputs
and 1 NC information output.
In order to protect the output contacts
it is recommended that loads (inductive)
are suppressed by fitting correctly chosen
VDR’s, diodes etc.
Diodes are the best arc suppressors,
but will increase the switch off time of
the load.
Transistor outputs
The RT6 has two(2) voltage free transistor
outputs for information.
The transistor outputs are supplied with
voltage to Y13, either from S53 (+24V)
or an external 5-30 VDC supply. Y14 and
Y24 follow the relay inputs and outputs
as follows:
• Y14 becomes conductive when the relay
input conditions are fulfilled.
• Y24 becomes conductive when both the
output relays are activated.
Testing external contactor status
Contactors, relays and valves can be
supervised by connecting ‘test’ contacts
between S53 and X1. Both manual supervised and automatic reset can be used.
***NOTE
These outputs are only for information
purposes and must not be connected to
the safety circuits of the machinery.
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Technical data - RT6
Manufacturer ABB AB/Jokab Safety, Sweden
Article number/Ordering data
RT6 24DC 2TLJ010026R0000
RT6 24 AC 2TLJ010026R0200
RT6 115 AC 2TLJ010026R0400
RT6 230 AC 2TLJ010026R0500
Colour Black and beige
Weight 335 g (24 VDC)
485 g (24-230 VAC)
Supply
Voltage (A1-A2) 24 VDC +15/-20%,
24 /4 8/ 115 /2 30 VAC,
+15/-10%, 50-60 Hz
Power consumption
DC supply, nominal voltage 2,3 W
AC supply, nominal voltage 5,2 VA
Connection S13
Short-circuit protected voltage output, 70 mA ± 10% current
limitation. Is used for the inputs S14, S34 and S44.
Connection S53
Short-circuit protected voltage output, internal automatic fuse
270 mA. Is used for the reset and autoreset inputs X1 and X4
Connection S23
0V connection for input S24
Safety inputs
S14 (+) input 20 mA
S24 (0V) input 20 mA
S34 (+) input 20 mA
S44 (+) input 30 mA
Reset input X1
Supply for reset input + 24VDC
Reset current 300 mA current pulse at
contact, then 30 mA
Minimum contact closure time
for reset 100 ms
Maximum external
connection cable resistance
at nominal voltage for
S14, S24, S34 300 Ohm
S44, X1 150 Ohm
Response time
At Power on DC/AC <90ms/<220ms
When activating (input-output) <20 ms
When deactivating (input–
output) <20 ms
At Power Loss <150 ms
Relay outputs
NO 3
NC 1
Maximum switching capacity
Resistive load AC 6A/250 VAC/1500 VA
Inductive load AC AC15 240VAC 2A
Resistive load DC 6A/24 VDC /15 0 W
Inductive load DC DC13 24VDC 1A
Maximum total switching capacity
Resistive load 12A distributed on all contacts
Minimum load 10mA/10 V (if load on contact
has not exceeded 100 mA)
Contact material Ag+Au flash
Fuses Output (External) 5A gL/gG
Conditional short-circuit
current (1 kA) 6A gG
Mechanical life >1 07 operations
Transistor outputs Short-circuit proof
External supply to Y13 +5 to +30 VDC
Y14 Indicates that the input
conditions have been fulfilled
Y24 Indicates that the output relays
are activated
Maximum load of Y14, Y24 15 mA /output
Maximum voltage drop at
maximum load 2.4 V
LED indication
On
In1 In2
1 2
Mounting
Rail 35 mm DIN rail
Connection blocks
(detachable)
Maximum screw torque 1 Nm
Maximum connection area:
Solid conductors 1x4mm2/2x1,5mm2/12AW G
Conductor with socket contact 1x2 ,5mm2/2x1m m
Protection class
Enclosure IP 40 IEC 60529
Connection blocks IP 20 IEC 60529
Operating temperature range -10°C to + 55°C (with no icing
Operating humidity range 35% to 85%
Impulse Withstand Voltage 2.5kV
Pollution Degree 2
Performance (max.)
The relays must be cycled at
least once a year.
Conformity 2006/42/EC, 2006/95/EC,
Connector blocks are detachable
(without cables having to be disconnected)
Supply voltage OK, the LED
is on. Flashing light in case of
under-voltage or overload
Indicates that the input
conditions are fulfilled.
Indicates that the output relays
are activated.
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or condensation)
Category 4/PL e
(EN ISO 13849-1:2008)
SIL 3 (EN 62061:2005)
PFHd 9.55E-09
2004/108/EC
EN 954-1:1996,
EN 62061:2005
EN ISO 13849-1:2008
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