Scrutinize a the following motor desion schematic, Identify faults, including any relevant protection absent. It is a single-phase motor; mains are 480 VAC.
*hint; think about what devices do when in or out or operation (linear models). Safety factors are of 10%, only need to identiy 10 of the faults but there is many more.
General notes: If ratings are not given, assume adequate design
note1: Conduit plate, hole diameters = 0.2cm; protect conductors from motor, made of pure aluminum
note2: Push button block with Rc auxilliary contact, latches to provide power across buttons when buttons closed
Note 3: Motor conductors are insulated but run across a milling plant floor where machines frequently travel
Note 4: H conductor = copper core; rubber insulated; size 10AWG
N conductor = copper core, rubber insulated; sice 12AWG
G conductor = Aluminum core, rubber insulated, size 14 AWG
Note 5; When Rc coil de-energized, Rcaux open; Rcaux is N/O
*hint; think about what devices do when in or out or operation (linear models). Safety factors are of 10%, only need to identiy 10 of the faults but there is many more.
General notes: If ratings are not given, assume adequate design
note1: Conduit plate, hole diameters = 0.2cm; protect conductors from motor, made of pure aluminum
note2: Push button block with Rc auxilliary contact, latches to provide power across buttons when buttons closed
Note 3: Motor conductors are insulated but run across a milling plant floor where machines frequently travel
Note 4: H conductor = copper core; rubber insulated; size 10AWG
N conductor = copper core, rubber insulated; sice 12AWG
G conductor = Aluminum core, rubber insulated, size 14 AWG
Note 5; When Rc coil de-energized, Rcaux open; Rcaux is N/O
