4.13 26/38/49 – RTD Protection Module
General – Principle Use
NOTICE!
The Resistance-based Temperature Detector (RTD) Protection Module uses temperature
data that are provided by Eaton's Universal Resistance-based Temperature Detector
(URTD) module (please refer to the URTD Module section) or Eaton's Universal Resistance-
based Temperature Detector II (URTDII) module (please refer to ╚═▷ “URTDII Module
Interface”).
The protective device provides tripping and alarming functions based on the direct
temperature measurements read from Eaton’s (URTD) device that has 11 temperature
sensor channels or Eaton's (URTDII) device that has 11 or 12 temperature sensor
channels.
• The “trip” function has only a threshold setting.
• Each individual »Alarm Function« will have a threshold setting range, and can be
individually enabled or disabled. Since the temperature cannot change
instantaneously (which is a way that temperature diers from current), the “delay”
is essentially built in to the function due to the fact that the temperature will take
some time to increase from room temperature to the “trip threshold” level.
• The dropout ratio for both trip and alarm is 0.99.
•
The temperature rise is limited by the RTD driver.
Channel Groups
The RTD channels are grouped:
• The channels WD1 … WD6 belong to the group “Temperature of the Winding”:
◦ Settings can be made in menu branch [Protection Para / RTD / WD Group]
◦ Status values can be found in menu branch [Operation / Status Display / Temp-
Prot / RTD / WD Group]
◦ Measured temperature values can be found in menu branch [Operation /
Measured Values / URTD]
• The channels MB1, MB2 belong to the group “Temperature of the Motor Bearing”:
◦ Settings can be made in menu branch [Protection Para / RTD / MB Group]
◦ Status values can be found in menu branch [Operation / Status Display / Temp-
Prot / RTD / MB Group]
◦ Measured temperature values can be found in menu branch [Operation /
Measured Values / URTD]
•
The channels LB1, LB2 belong to the group “Temperature of the Load Bearing”:
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4 Protective Elements
4.13 26/38/49 – RTD Protection Module
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