We used basically the exact same circuit to make a reverseable winch - only we used 4 "ford type" remote NO starter relays instead - two opposite diagonals were connected to run in an H bridge ran the motor FWD when you engaged those relays and the two in the opposite diagonal engaged to run the motor in REV. When neither diagonal was engaged, the motor sat idle.
By moving the fuse to the motor/switch side of the junction of the OVDC and PLC ground junction, you'll fuse the line in a way that you won't open up the ground and dump all the current thru the PLC ground side when/if you blow the fuse.
By using 4 separate relays, you can shut off ALL current simply when the relays go into a NO condition. If you use a NO/NC system in your device, the motor will ALWAYS try to run in one direction or another when the solenoids are disengaged. |