To prevent unintentional energization of both the forward and reverse coil at the same time, the coils are equipped with normally closed contacts, which are then wired in series with the opposite direction’s coil to act as an electrical interlock. Reversal of three-phase motor rotationīoth coils power contacts feed through a single set of OLR to provide running protection in both directions. When the alternate coil is energized, Lines 1 and 3 are interchanged with Terminals 1 and 3, allowing for a phase shift in the 3-phase circuit, driving the motor and causing it to rotate in the opposite direction. They are connected so that under normal conditions, one coil will connect L1 with T1, L2 with T2, and 元 with T3. Motor Starters and Contactors 15 Forward/Reverse Starters NEMA Forward Reverse motor starter with OLRĪ forward/reverse magnetic motor starter is constructed from two regular contactors installed with a mechanical interlock that prevents both coils from pulling in simultaneously.
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