z 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 RB2 power stack is designed for class 10 duty without derating. Refer to the
RB2 for the specific RB2 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 www.benshaw.com for an automated overload calculator.
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7 - THEORY OF OPERATION
11
1010
100100
10001000
1000010000
100 150 200 250 300 350 400 450 500 550 600 650 700 750 800100 150 200 250 300 350 400 450 500 550 600 650 700 750 800
Current % (FLA)Current % (FLA)
Seconds to TripSeconds to Trip
Class 5Class 5
Class 10Class 10
Class 15Class 15
Class 20Class 20
Class 25Class 25
Class 30Class 30
Class 35Class 35
Class 40Class 40
Figure 25: Commonly Used Overload Curves
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