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#Forward and reverse motor control schmetic series#
This means that if the coil that drives the motor in the forward direction is energized, a normally closed set of contacts wired in series with the reverse coils will prevent that coil from being energized as long as the forward coil remains energized. A schematic diagram of a forward-reverse control for a single-phase.
Dynamic braking stops the motor when the switch returns to Off. 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. The circuit shown here provides two-direction control (forward and reverse) for a three-phase electric motor: L1 L2 M1 To 3-phase motor power source M1 OL Forward OL Reverse M2 M2 M1 M2 Explain how the reversal of motor direction is accomplished with two dierent motor starters, M1 and M2. Module automatically reverses the direction of the motor when the appropriate control circuit is energized with a pulse from a control switch. 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. Now, if either forward or reverse circuits are latched, they may be unlatched by momentarily pressing the Stop pushbutton, which will open either forward or reverse circuit, de-energizing the energized contactor, and returning the seal-in contact to its normal (open) state. 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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