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Motor Control 200 > Chapter 10 & 26 > Flashcards

Chapter 10 & 26 Flashcards

1
Q

The voltage drop when an AC motor drive is measured to have 230V with no load and 226V under full load is ________ V.

A

4

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2
Q

When using a motor drive to control a motor, the drive is wired following the __________ wiring diagram provided by the drive manufacturer.

A

control-circuit

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3
Q

Some drives may include built-in PLC/PLR functions such as internal timers and ____________ .

A

counters

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4
Q

Display parameters normally include ___________ .

A

Drive output frequency
motor current draw
drive output voltage

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5
Q

Common motor drive faults include ___________ .

A

power loss

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6
Q

DC motor drives include _________ and/or regenerative braking.

A

dynamic

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7
Q

Current to an AC motor drive is limited by the size of the conductors to the drive, _________, and transformer(s) delivering power to the system.

A

fuse and circuit beaker sizes

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8
Q

The voltage drop percentage when an AC motor drive has a 4V drop with a 230V no-load measurement is __________ %.

A
  1. 739%

1. 7

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9
Q

The control voltage of a motor drive is normally __________ VDC or 24 VDC.

A

12

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10
Q

__________ motor drives are available for connection to DC or AC power supplies.

A

DC

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11
Q

__________ is a method of controlling the amount of voltage sent to a motor.

A

Pulse width modulation (PWM)

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12
Q

AC motors should not be driven at speeds greater than __________ % above their rated nameplate speed.

A

10

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13
Q

In industrial system, standard control-circuit power is supplied at 0V to __________ V.

A

10

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14
Q

__________ parameters are normally the most conservative and frequently used parameter values that create the least amount of risk to equipment and personnel.

A

Default

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15
Q

The two major methods of braking a DC motor faster tan by coasting are dynamic braking and __________ braking.

A

regenerative

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16
Q

The three main sections of AC motor drives are converter, DC bus, and ____________ .

A

inverter

17
Q

Capacitors and __________ in a DC bus filter and maintain proper voltage level.

A

inductors

18
Q

__________ is the frequency that controls the number of times solid-state switches in an inverter of a pulse width modulation motor drive turn ON and OFF.

A

The carrier frequency

19
Q

The speed of a AC motor is determined by the number of __________ and frequency of the AC power supply.

A

stator poles

20
Q

A magnetic motor starter can turn a motor __________ and OFF, but cannot set the acceleration and deceleration times for the motor.

A

ON

21
Q

The cost of a motor drive for any given horsepower ___________ with drives that offer advanced features.

A

increases

22
Q

__________ work well in applications that require basic ON and OFF motor control.

A

magnetic motor starter

23
Q

As the length of conductors increases and/or the motor drive output carrier frequency increases, voltage spikes __________ .

A

increases

24
Q

When voltage spikes become a problem, motor lead length should be ___________ and/or filters that suppress voltage spikes should be added.

A

reduced

25
Q

A(n) __________ is an electronic unit designed to control the speed of a motor using solid-state components.

A

motor drive

26
Q

The energy produced from a DC motor when it acts as a DC generator is called __________ .

A

counter electromotive force (CEMF)

27
Q

__________ is a method of motor braking in which the regenerated power of a DC motor that is coming to a stop is returned to the input power supply.

A

Regenerative braking

28
Q

Controlling the ___________ ratio applied to an AC motor controls motor torque.

A

volts-per-hertz

29
Q

When pulse width modulation is used with AC voltage, __________ insulated-gate bipolar transistors are used for each phase.

A

two

30
Q

To prevent damage to diodes in a converter and to AC motor drive electronic circuits, protection against ___________ must be included in the drive.

A

transient voltages

Motor Control 200 (10 decks)

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