Basler Electric BE1-11g - Manual (Page 155)

9424200994 Rev N 143
Resistance Temperature Detector
(49RTD) Protection
Fourteen resistance temperature detector (49RTD) elements provide over/undertemperature protection in
applications when a remote RTD module is connected via Ethernet or RS-485. Refer to the RTD Module
chapter for information on mounting, connections, communication setup, and specifications.
The fourteen, identical remote RTD protection elements are designated 49RTD-1 through 49RTD-14.
Element logic connections are made on the BESTlogic
™Plus screen in BESTCOMSPlus® and element
operational settings are configured on the Remote RTD (49RTD) settings screen in BESTCOMSPlus. A
summary of the logic inputs and outputs and operational settings appears at the end of this section.
BESTCOMSPlus Navigation Path: Settings Explorer, Protection, Thermal, Resistance Temperature
Detector (49RTD)
HMI Navigation Path: Settings Explorer, Protection, Settings Group x (where x = 0 to 3), Thermal
Protection, Resistance Temp 49RTD
Element Operation
Each RTD input can be configured to protect against high, low, or both temperature conditions.
Modes of Protection
Three modes of protection are available: Over, Under, and Over/Under.
In Over mode, if the temperature of the RTD is above the Over Pickup setting, the element will pick up. In
Under mode, if the temperature of the RTD is below the Under Pickup setting, the element will pick up. In
Over/Under mode, if the temperature of the RTD is above the Over Pickup setting or below the Under
Pickup setting, the element will pick up. The element will remain in the picked-up condition and continue
timing towards a trip unless the temperature falls below the Over Pickup setting or rises above the Under
Pickup setting.
Source
The Source setting selects which RTD input to monitor. Refer to the RTD Module chapter for more
information.
Pickup and Trip
The Pickup output occurs first, followed by the Trip output.
Pickup
The Pickup output becomes true when the measured remote RTD input value increases above (Over
mode) or decreases below (Under mode) the pickup setting. In BESTlogicPlus, the Pickup output can be
connected to other logic elements to annunciate the condition, control other elements in logic, and start
the fault recorder (logic element FAULTTRIG).
Assertion of the Pickup output initiates a timer that begins timing to a trip. The duration of the timer is
established by the Time Delay setting. A Time Delay setting of zero (0) makes the element instantaneous
with no intentional time delay.
If the pickup condition subsides before the element delay expires, the timer and Pickup output are reset
and no corrective action is taken.
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
BE1-11g Resistance Temperature Detector (49RTD) Protection