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Technical
Information
Inputs
The RT6 can be configured to operate in either of the
following input options:
1. Single channel, 1 NO contact from +24 V DC, safety
category 1.
2. Dual channel, 2 NO contacts from +24 V DC, safety category
3.
3. Dual channel 1 NO, 1 NC contact from +24 V DC, safety
category 4.
4. Dual channel, 1 NO contact from 0V and 1 NO contact
from +24 V DC, safety category 4.
5. Safety mats/contact strips 1 'contact' from 0V and
1 'contact' from +24 V DC, safety category 1.
Category above refers to safety category as defined in
EN954-1 (AS4024-1).
When the input/inputs are activated and the test/supervised
reset is complete, relays 1 and 2 are energized. These
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 RT6 can be reset.
Transistor Output Status Information
The RT6 has two PNP 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.
Reset and Testing
The RT6 has 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), if for
example, contactors and valves etc are de-energized/de-activated
before a restart is allowed.
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.
Power failure, 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 double 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
standards. Examples of such are: EN 292-1/2, EN 60204-1,
EN 954-1.
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