19-2 9424200996
Resistance Temperature Detector (49RTD) Protection BE1-11m
Trip
The Trip output becomes true if a pickup condition persists for the duration of the element Time Delay. In
BESTlogicPlus, the Trip output can be connected to other logic elements and to a physical relay output to
annunciate the condition and to initiate corrective action. If a target is enabled for the element, the
BE1-11m will record a target when the Trip output becomes true. See the Fault Reporting chapter for
more information about target reporting.
Voting
The Voting parameter defines the number of RTDs in the group that must exceed the pickup setting to
cause a trip. For example, if the 49RTD-1 Voting setting is three, then at least 3 RTDs in the selected
group must exceed the pickup setting to cause a trip.
Element Blocking
The Block input provides logic-supervision control of the element. When true, the Block input disables the
element by forcing the Trip and Pickup outputs to logic 0 and resetting the element timer. Connect the
element Block input to the desired logic in BESTlogicPlus. When the element is initially selected from the
Elements view, the default condition of the Block input is a logic 0.
Logic Connections
Remote RTD input element logic connections are made on the BESTlogicPlus screen in
BESTCOMSPlus. The remote RTD input element logic block is illustrated in Figure 19-1. Logic inputs and
outputs are summarized in Table 19-1.
Figure 19-1. Remote RTD Input Element Logic Block
Table 19-1. Logic Inputs and Outputs
Disables the 49RTD function when true
True when the 49RTD element is in trip condition
True when the 49RTD element is in pickup condition
Operational Settings
Remote RTD input element operational settings are configured on the Resistance Temperature Detector
settings screen (Figure 19-2) in BESTCOMSPlus.
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