Four-Quadrant Operation Describes the operation variable speed drive that capable
of providing forward reverse torque with the motor rotating in
either the forward reverse direction.
Full-Voltage Starter type motor starter often used for three-phase induction
motors that applies the full line voltage the motor
immediately.
Contactor
Overload
Relay
Motor Starter
Circuit Breaker
L1
L2
L3
M
M
M
OL
OL
OL
OL
M
Ma
Auxiliary
(Holding)
Contact
Overload
Contact
Starter
Coil
Overload
Relay
Contactor
. Sometimes called across-the-line starter.
Switchboard
Feeder Busway
Filler Plates Plates used cover unused spaces panel.
T Torque
N Speed
+ Forward
+N
-N
CW Rotation
CW Rotation
CCW Rotation CCW Rotation
First Quadrant
Braking
Driving
Braking Driving
+T
-T
T
N
N
T
T
N N
T
Fourth Quadrant
Second Quadrant
Third Quadrant
- Reverse
Frequency The rate variation periodic waveform.14
Feeder Busway Busway used distribute feeder current loads that are
sometimes remote from the power source.The symbol for
frequency “f.
”The unit for frequency Hertz
