Rockwell Automation 825 Smart Motor Manager User Manual - Manual (Page 89)

Functions 3-56
Publication 825-UM001B-EN-P January 2001
Functions of the Cat. No. 825-MMV Option Card
PT100 (100
Ω Ω Ω Ω
Platinum) Temperature Sensor (RTD)
The PT100 temperature detectors are often embedded in the stator winding and/or the
bearings, especially in large motors. The Smart Motor Manager monitors the actual stator,
bearing, and coolant temperature. The resistance from a PT100 temperature detector is
dependent on the temperature and has a positive temperature coefficient (0.4
Ω / ° C).
Table 3.AD PT100 Temperature Detector Resistance per IEC 751
Sensors that are not connected must be switched off. Temperature sensors #1…#6 monitor
the actual stator or bearing temperatures.
• The temperature is continuously indicated in ° C
• The alarm and tripping temperatures can be set as desired
Applications
• Large low voltage motors
• Medium- and high-voltage motors
• At high ambient temperatures
• When cooling is obstructed.
Temperature ( ° C ) Resistance (
Ω Ω Ω Ω
)
0 100.00
50 119.40
100 138.50
150 157.31
200 175.84