Specifications

84
Four-Quadrant Operation Describes the operation of a variable speed drive that is capable
of providing forward or reverse torque with the motor rotating
in either the forward or reverse direction.
T = Torque
N = Speed
+ = Forward
+N
-N
CW RotationCW Rotation
CCW Rotation CCW Rotation
First Quadrant
BrakingDriving
Braking Driving
+T-T
T
N
N
T
T
N
N
T
Fourth Quadrant
Second Quadrant
Third Quadrant
- = Reverse
Frequency The rate of variation of a periodic waveform. The symbol for
frequency is “f.” The unit for frequency is Hertz.
Full-Voltage Starter
A type of motor starter often used for three-phase induction
motors that applies the full line voltage to the motor
immediately. Sometimes called an across-the-line starter.
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
Fuse A device designed to open a circuit when its rated current is
exceeded. This is usually accomplished when a metal link in the
fuse melts. Renewable fuses allow the user to replace the link
and non-renewable fuses do not. Fuses are available in various
sizes and types. Some have a time delay.
Fuse Class A letter designation given to a fuse to identify its operating and
construction characteristics.
German Institute for Recognized since 1975 as the standards organization that
Standardization (DIN) represents German interests nationally and internationally.