Jokab Safety RT7 Catalog Page
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Safety relay
RT7
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
Universal relay with delayed outputs
The RT7 is a universal relay that can be used to supervise both
safety devices and the internal safety of your machinery. In addition, you can select the safety level that is required for each
installation. All this is possible because the RT7 has the most
versatile input options arrangement available on the market. The
RT7 can therefore replace many other relays.
The RT7 has four (4 NO) dual safety outputs of which two may
be delayed for up to three seconds in order to achieve a safe
and ‘soft’ stop. A ‘soft’ stop allows machinery to brake and stop
gently before power is removed. A ‘soft’ stop has many benefits:
the machinery life will be prolonged, processed products will not
be damaged, and restarts from the stopped position are made
possible and easier.
Another option with the RT7 is manual or automatic resetting. A
manual supervised reset is used for gates and other safety devices
that can be bypassed, while an automatic reset is used for small
safety hatches if deemed appropriate from a risk point of view.
In addition, the RT7 has information outputs that follow the
inputs and outputs of the relay. These outputs indicate if for example a gate is opened or closed, if there is a delay or if the relay
needs to be reset.
Choose the RT7 to simplify your safety circuits and reduce
your costs.
Features:
4 NO/1 NC relay outputs, 2
NO outputs can be delayed
for soft stops
Delay times RT7A 0; 0,5;
1,0; 1,5 s RT7B 0; 1,0; 2,0;
3,0 s
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
Three voltage free transistor
information outputs
Supply 24 VDC, 24, 48, 115
or 230 VAC
Quick release connector
blocks
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Technical information - RT7 A/B
Inputs
The RT7 can be configured to operate in either of the following
input options:
Single channel, 1 NO contact from +24 VDC, safety 1.
category 1, up to PL c
Dual channel, 2 NO contacts from +24 VDC, 2. category 3,
up to PL d
Dual channel, 1 NO, 1 NC contact from +24 VDC, 3.
category 4, up toPL e
Dual channel, 1 NO contact from 0V and 1 NO contact 4.
from +24 VDC, category 4, up toPL e
Safety mats/contact strips, 1 ‘contact’ from 0V and 1 5.
‘contact’ from +24 VDC, category 3, up toPL d
Safety level
The RT7 has internal dual and supervised safety functions. Power
failure, an 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 RT7 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.
1
2
3
When the input/inputs are activated and the test/supervised reset is complete, relays 1,2,3 and 4 are activated. Relays 1 and 2
are immediately de-energized when the inputs are deactivated in
accordance with the input option selected. Relays 3 and 4 are
either de-energized immediately or after the selected time delay.
All the relays (1,2,3 and 4) must be de-energized before the RT7
can be reset.
Transistor output status information
The RT7 has three(3) 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.
Reset and testing
The RT7 has two reset options; manual and automatic.
The manual supervised reset is utilised when the RT7 is used
to monitor safety devices that can be bypassed, i.e. to ensure
that the outputs of the safety relay do not close just because the
gate is closed.
The automatic reset should only be used if acceptable from a
risk point of view. The RT7 can also test (super vise), 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 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.
Regulations and standards
The RT7 is designed and approved in accordance with appropriate directives and standards. Se tekniska data.
Connection examples
For examples of how our safety relays can solve various safety
problems, see the section “Connection examples”.
**Only for AC supply
4
5
6
7
8
Connection examples – RT7
DC supply
The RT7 DC option should be supplied
with +24 V on A1 and 0 V on A2.
AC supply
The RT7 AC option should be supplied
with the appropriate supply voltage via
connections A1 and A2.
The S23/ must be connected to protective earth
DC-supply of AC-units
Samtliga AC-moduler kan också matas
med +24 VDC på S53 och 0V på 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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12
13
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