Intro to Variable Frequency AC Drives Mod 1

Two common types of variable speed AC drives are General-Purpose and _________________ drives.

• Servo

• Vector

• Inverter

• Looping

The __________________ section of a general-purpose drive uses rectifiers to convert AC to DC

• Inverter

• Armature

• Converter

• transformer

A(n) ____________________ drive includes a feedback device to provide speed and direction feedback.

• Feedback

• Vector

• Half-load

• Alternating

One of the disadvantages of using an AC drive and motor instead of a DC drive and motor is that the AC motor cannot match the DC motor's _______________ torque.

• Lineup

• Stopping

• Starting

• Braking

DC motors are usually heavier and larger that three-phase motor of equivalent _____________________.

• Power

• Horsepower

• Current

• Load

In many applications, ________________ controls are required to control a variable speed drive.

• Internal

• External

• Output

• input

Common inputs to a variable frequency drive include manual inputs, ______________ devices, potentiometers, and PLCs

• Proximity

• Output

• Automatic

• Speed

Variable frequency drives provide inputs for line power and _______________ for the motor.

• Inputs

• Outputs

• Voltage

• Current

Some drives include _______________________ that can be used to turn on external devices such as an indicator light.

• Input Relays

• Frequencies

• Output relays

• Clutches

The user of a variable frequency drive can select what signal will provide the ______________- command

• Speed

• Stop

• Brake

• Output