Rockwell Automation 825-P Modular Protection System for Motors User Manual - Manual (Page 103)

Rockwell Automation Publication 825-UM004D-EN-P - November 2012 103
Configuring Protection & Logic Functions Chapter 6
Overload Curves
Figure 34 - Thermal Overload Curves
100000
10000
1000
100
10
1
1 2
Multiples of Full Load Amps
Trip Time in Seconds
3 4 5 6 7 8 9 10
600
400
200
100
50
25
10
5
Locked Rotor Time
(in seconds)
Trip times are for cold
(ambient) motor, without preload.
Service Factor, SF = 1.01
Acceleration Factor, TD = 1.00
Run State Time Constant, RTC = Auto
Motor LRC = 6.0 • Ie
Relay Settings