What is the definition of ANSI 48/51LR/14 - Locked rotor / excessive starting time?

Protection of motors against overheating caused by:

• excessive motor starting time due to overloads (e.g. conveyor) or insufficient supply voltage.

The reacceleration of a motor that is not shut down, indicated by a logic input, may be
considered as starting.

• locked rotor due to motor load (e.g. crusher):

1. in normal operation, after a normal start
2. directly upon starting, before the detection of excessive starting time, with detection of locked rotor by a zero speed detector connected to a logic input, or by

the underspeed function.

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