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Rockwell Automation Publication 150-UM009E-EN-P - August 2021
Chapter 3 Programming
Motor Overload Trip Curves
The trip class should be set according to the motor’s maximum permissible
locked rotor time or the general thermal capabilities. Consult the motor
manufacturer for recommendations on setting the trip class.
Figure 12 - Trip Class
Input and Output Timing
Figure 13 - Input & Output Timing
Class 10
Class 15
Class 20
Multiple of FLA
t (sec)
8
10
6
4
2
1
1000
100
10
1
0.1
800
600
400
200
80
60
40
20
8
6
4
2
0.2
0.4
0.6
0.8
8
10
6
4
2
1
8
10
6
4
2
1
1000
100
10
1
0.1
800
600
400
200
80
60
40
20
8
6
4
2
0.2
0.4
0.6
0.8
1000
100
10
1
0.1
800
600
400
200
80
60
40
20
8
6
4
2
0.2
0.4
0.6
0.8
COLD START
HOT START
Basic Timing Diagram, No Soft Stop
Possible Aux Contact Configuration
On
Off
Control Po
w
er
Start Enable
Fault Contact
(Fault Contactor)
Closed
Open
Up-to-Speed
Normal
Fault Occurs
Fault Reset
On
Off
Closed
Open
Closed
Open