Deck 16: Commissioning a VFD

Question 1

A common terminal with both normally open and normally closed contacts is called a ____ contact.

A)terminal
B)transfer
C)VFD
D)magnetic

Answer 1

B

Question 2

_______________ a VFD involves both the wiring connections, and the operating parameter programming necessary to make the VFD functional for a particular application.

Answer 2

Commissioning

Question 3

____ input simply means that the VFD uses electronic circuitry on the inputs that senses only two states; either the control voltage is present on the input, or it is not.

A)Analog
B)Digital
C)Magnetic
D)Terminal

Answer 3

B

Question 4

Reversing the motor with a VFD is as simple as inserting a selector switch between the DCM and digital input #2 terminals.

Question 5

_______________ are electronic microprocessor-based motor controllers that may take the place of magnetic motor starters for most applications.

Question 6

The _______________ connection of the stop and start pushbutton control circuit for the VFD looks similar to the control circuit of a magnetic motor starter, but the operation is slightly different.

Question 7

Most VFDs have analog inputs for control.

Question 8

What are at least four of the basic operation default parameters programmed in a VFD?

Question 9

Once the VFD is enabled, pressing the ____ pushbutton will cause the unit to start and operate in response to the programmed operating parameters.

A)start
B)jog
C)reverse
D)stop

Question 10

The relay outputs are similar to the auxiliary contacts on magnetic motor starters.

Question 11

Pressing the ____ pushbutton will again disable the VFD, but bring the motor to a stop by the programmed stop parameters.

A)start
B)jog
C)reverse
D)stop

Question 12

Describe a digital input.

Question 13

When the DCM voltage is present on digital input #2, the VFD will operate the motor in the _______________ direction of rotation.

Question 14

Digital input simply means that the VFD uses electronic circuitry on the inputs that senses only two states, either the control voltage is present on the input, or it is not.

Question 15

The term commissioning simply means to put into service.

Question 16

Analog inputs are capable of sensing a gradient of different levels of voltage or current, but digital inputs are not.

Question 17

Motor defined input means that the user can program each of the inputs to serve different functions.

Question 18

VFDs take the place of magnetic motor starters for all applications.

Question 19

The main difference between the output relays of VFDs and auxiliary contacts of magnetic motor starters is that the user cannot define which operating parameter the relays are programmed to report.

Question 20

____ defined input means that the user can program each of the inputs to serve different functions, such as jog, reverse, external reset, hold speed, or go to a pre-determined speed.

A)NEMA
B)IEC
C)Motor
D)User