Chapter 18 Motor Load, Torque, and Power Quality Requirements :Workbook Questions

when a motor drive is used to control a motor can the drive be programmed to add an additional torque boost if the application requires it?

Yes

When does a motor draw the highest amount of current from the power supply?

When running and when starting

What is the acceptable operating voltage range for newer electrical and electronic equipment?

+5%-10%

Are voltages sags or voltages swells a more common problem?

Voltage sags

What is a brownout?

a reduction of the voltage level by a power company to conserve power during times of peak usage or excessive loading of the power distribution system

What are the two types of transients voltages produced on a power distribution system?

oscillatory transient voltages and impulse transient voltages

If a drive is used to operate the spool of a paper roller, what setting (CT, VT, or CH) should be used?

CH/VT

If a drive is used to operate a variable-speed industrial food-mixing machine, what setting (CT, VT,or CH) should be used?

(VT/VH)

What type of torque is required to produce for a motor at full speed?

Full-load torque (FLT)

What type of torque is required to start turning a motor shaft?

Locked rotor torque (LRT)

What circuit transition method is the least expensive type that can be used?

open circuit transition

Why is a closed circuit transition preferred when switching a motor from reduced voltage to full voltage?

close circuit transition does not cause a high-current transition surge