Briefly describe two considerations when selecting a starter for a particular motor drive situation.
What will be an ideal response?
When selecting a starter for a particular motor drive situation, you should consider several things:
• Is there a need for solid-state starting if the driven machinery of the electrical supply lines requires a form of reduced-voltage/reduced-current starting?
• Consider whether the driven machinery can start with reduced torque, compared to full voltage ATL starting.
• If the motor is to have multiple set speeds, the correct number of frequency set points must be determined and matched with the controller’s capability.
• Depending on the need for accuracy of the motor speed and the amount of control desired, various methods of control may be considered.
You might also like to view...
Often, compound angle problems are encountered when machining parts as shown on engineering drawings. Usually, the top, front, and ____________________ views of orthographic projections are shown.
Fill in the blank(s) with the appropriate word(s).
Analyze the frame in Figure P11.29 by moment distribution. Draw the shear and moment curves. Sketch the deflected shape. E is constant and equals 30,000 kips/in. 2 . I = 300 in. 4 for all members.
The ambient temperature around a diode increases. Assuming all else remains the same then
A) IR will decrease and IF will increase B) IR will increase and IF will decrease C) IR will decrease and VF will increase D) IR will increase and IF will increase
What is the flow rate per ton of refrigeration for geothermal heat pumps?
A. 3-7 gpm B. 7-10 gpm C. 10-15 gpm D. 15-22 gpm