Mod C Flashcards
Reversing a 3 phase motor starter by doing what in a fwd rev starter
Reversing any 2 lines
How many overload relays required on a 3phase reversing magnetic starter?
Just one
Why is mechanical interlocking required?
Stop a short cct
Why is electrical interlock used?
Prevent coil burn out
Electrical interlocks contacts are connected in what way,?
In series with coil of other contactor
Purpose of holding contacts?
Coil energized after start button released
How many holding contacts does a reverse magnetic starter employ?
2 holding contacts
Name 7 sections of control cct of reversing magnetic starter
Gernal stop
Forward stop
Reverse stop
Forward start
Reverse start
Forward holding
Reverse holding
IEC OL numbers
95 96
IEC foward start numbers
13 14
NEMA forward start numbers
2 3
NEMA reverse start numbers
4 5
