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Limit Switches Control DC-Motor H Bridge

Andreas Grün, Wedemark, Germany

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03.19.09-- You use limit switches to switch off a motor if it reaches one of its two end positions. Even if you build a microprocessor-based motor controller, you should switch off a motor with hardware by building a safety interlock. Such a circuit works by inhibiting movement in one direction but allowing movement in the other direction when the motor retracts from its end position. Figure 1 shows the circuit with mechanical switches. However, this ancient mechanical approach may be unsuitable in some cases because the motor current may be too high, or the switches may be closing switches or light barriers.

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