Technical information

8 – THEORY OF OPERATION
Motor Overload
111
Commonly Used Overload Curves
1
10
100
1000
10000
100 150 200 250 300 350 400 450 500 550 600 650 700 750 800
Current % (FLA)
Seconds to Trip
Class 40
Class 5
Class 10
Class 20
Class 15
Class 30
NOTE: In some cases the power stack rating may determine what motor overload settings are available. Each power stack is
designed to support specific motor overload classes. The RBX power stack is designed for class 10 duty without derating. Refer to
the RBX Hardware Manual for the specifics of the RBX overload capabilities. Also, in certain heavy duty DC braking applications,
the overload settings may be limited to protect the motor from potential damage during braking.
Visit the web at http://www.benshaw.com/olcurves.html for an automated overload calculator.