Figure above shows two complex relay configurations with four relays
connected in H-bridge order around each motor. Relays A and B connect the
P.M.D.C. motors to the positive and negative sides of the battery, respectively
relays C and D connect the other side of the P.M.D.C. motors to the positive
and negative sides of the battery. The same battery voltage equal to 24Volts is
used to drive both P.M.D.C. motors. When forward and reverse switches result,
in relays A and C being energized and relays B and D being de-energized the
motors have zero speed. To run the motors forward, the forward switch must be
activated and cause relay C to de-energize and relay D to energize. This action
will cause a complete circuit and will let the motors to run connected to
relays A and D on the positive and negative battery sides. To run the motors
reverse, the reverse switch must be activated. Activating the reverse switch
will cause a current flow from the battery, through relays C and B.
P.M.D.C. stands for Permanent Magnet Direct Current Motor.
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