SIEMENS
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Siemens IK PI · 2015
IO-Link
SIRIUS 3RR24 monitoring relays for mounting onto 3RT2 contactors for IO-Link
Current and active current monitoring
5
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Benefits
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Can be mounted directly on 3RT2 contactors and 3RA23
reversing contactor assemblies, in other words, there is no
need for additional wiring in the main circuit
•
Optimally coordinated with the technical characteristics of the
3RT2 contactors
•
No separate current transformer required
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Variably adjustable to overshoot, undershoot or range
monitoring
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Freely configurable delay times and RESET response
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Display of ACTUAL value and status messages
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All versions with removable control current terminals
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All versions with screw or spring-type terminals
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Simple determination of the threshold values through direct
reference to actually measured values for setpoint loading
•
Range monitoring and selectable active current measurement
mean that only one device for monitoring a motor is required
along the entire torque curve
•
In addition to current monitoring it is also possible to monitor
for current unbalance, broken cables, phase failure, phase
sequence, residual current and motor blocking.
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Integrated counter for operating cycles counter and operating
hours to support requirements-based maintenance of the
monitored machine or application
•
Simple cyclical transmission of the current measured values,
relay switching states and events to a controller
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Remote parameterization
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Automatic reparameterizing when devices are exchanged
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Simple duplication of identical or similar parameterizations
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Reduction of control current wiring
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Elimination of testing costs and wiring errors
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Reduction of configuration work
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Integration in TIA means clear diagnostics if a fault occurs
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Cost saving and space saving in control cabinet due to the
elimination of AI and IO modules as well as analog signal con-
verters and duplicated sensors
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Application
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Monitoring of current overshoot and undershoot
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Monitoring of broken conductors
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Monitoring of no-load operation and load
shedding, e.g. in the event of a torn V-belt or no-load operation
of a pump
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Monitoring of overload, e.g. on
pumps due to a dirty filter system
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Monitoring the functionality of electrical loads such as heaters
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Monitoring of wrong phase sequence on mobile equipment
such as compressors or cranes
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Monitoring of high-impedance short-circuits,
e. g. due to damaged insulation or moisture
The use of SIRIUS monitoring relays for IO-Link is particularly
recommended for machines and plant in which these relays, in
addition to their monitoring function, are to be connected to the
automation level for the rapid, simple and fault-free provision of
the current measured values and/or for remote parameterization.
The monitoring relays can either relieve the controller of monitor-
ing tasks or, as a second monitoring entity in parallel to and in-
dependent of the controller, increase the reliability in the process
or in the system. In addition, the elimination of AI and IO modules
allows the width of the controller to be reduced despite signifi-
cantly expanded functionality.
© Siemens AG 2014