In figure "B" of the illustrated control circuit schematic diagram, which of the listed devices prevents the forward and reversing coils from being energized simultaneously? See illustration EL-0011.
• Electrical interlocking between forward (F) and reverse (R) contactors • Role of auxiliary contacts (normally open vs normally closed) in control circuits • How pushbutton wiring can provide mechanical/electrical interlock to prevent both coils from being energized
• Trace the control circuit in Figure B and imagine pressing the FWD pushbutton while the REV coil is already energized. What contacts open or close, and in what order? • Look at which auxiliary contacts are shown as normally open and which are normally closed. Which of these will break the circuit path to the opposite coil when one coil is energized? • Compare what the pushbutton interlocking alone can do versus what the auxiliary contacts add. Does either method by itself fully prevent both coils from being on at the same time?
• Identify which contacts in Figure B are labeled with F and R and whether they are drawn as normally open or normally closed in the control circuit. • Verify which components are operated by the pushbuttons and which are operated by the contactor coils themselves (electrical interlock). • Confirm that the device(s) you choose will always interrupt the power path to one coil when the other coil is energized, regardless of operator action.
No comments yet
Be the first to share your thoughts!