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Technical
Information
Inputs
The RT9 can be configured to operate in either of the
following input options:
1.Single
channel, 1 NO contact from +24VDC, safety category 1.
2.Dual channel, 2 NO contacts from +24VDC, safety category
3.
3.Dual
channel, 1 NO, 1 NC contact from +24VDC, safety category
4.
4.Dual
channel, 1 NO contact from 0V and 1 NO contact from
+24VDC, safety category 4.
5.Safety
mats/contact strips 1 'contact' from 0V and 1 'contact'
from +24VDC, safety category 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 RT9 can be reset.
Relay
Output Status Information
The RT9 has a changeover contact relay output that can
be connected to a PLC, control lamp, computer or similar.
The output gives information about the status of the
relay.
Reset
and Testing
The RT9 has two reset options; manual and automatic.
The manual supervised reset is used when the RT9 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.
Due
to special internal circuits the RT9 can be automatically
reset regardless of the operational voltage rise time,
this being an important factor when large loads are
started up on the same power supplies at the same time.
In
addition, the RT9 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 RT9 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 RT9 is configured for dual channel input, both the
inputs are supervised for correct 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
RT9 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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