As shown in the illustration of a DC diesel-electric propulsion drive system, what would be the set up contactor configurations if #1 M/E is to be secured, so that only #2 M/E diesel-generator is set up to supply both propulsion motors? Illustration EL-0141
• DC diesel-electric propulsion layouts and how generators connect into a common propulsion armature loop • The functions of generator contactors (G1, G2) versus the return/path contactors (S1, S2) in the diagram • How securing one M/E means completely isolating its DC generator from the propulsion circuit
• Trace the heavy black propulsion armature loop and ask: through which contactors must current pass for a generator to feed BOTH motors? • When #1 M/E is secured, which contactors associated with its DC generator must be open so no current can flow to or from that machine? • For the remaining online generator, which pair of contactors must be closed so that both the outgoing and return paths are complete?
• Verify which contactors are physically drawn in series with M/E #1’s DC generator and the propulsion armature loop • Confirm that the operating generator must have both its G and S contactors closed to complete a circuit to the motors • Ensure the choice you pick leaves only one generator connected to the propulsion armature loop while the other is fully isolated
No comments yet
Be the first to share your thoughts!