Burhans Research VFD General Knowledge Quiz

1. A drive operates mulitiple motors. What devices are required for each motor, in addition to the drive?

 

3) Consulting engineers have specified a drive with a bypass option. Which below, might NOT be included in the specification, but should be?

 

5) The VFD will be installed in an electrical room, on a hospital surgical floor. What would be a key consideration in application engineering?

 

7) A drive specification includes the capability of starting from a remote switch, and the keypad. The drive option referred to is...

 

9) A conveyor sometimes starts with a full load of product on it. A vfd should be sized according to the motor full load amps, and what other rating?
2) The drive will be mounted in a dry, dusty environment. What NEMA enclosure is recommended?

 

4) When installing a drive in an enclosure, what key information about the drive, should you know? 

 

6) The drive is being installed on an existing motor in a roof mounted air handling unit. Which choice below is not a significant factor in this application?

 

8) A variable frequency drive is required for a machine where control of motor speed and torque are critical. What should be the drive operation mode?

 

10) The drive manufacturer specifies the maximum distance of lead wires to the motor is 100 feet. What are they concerned about?

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