factoryrat
Member
- Location
- Detroit
2005 NEC:
"ARTICLE 100 Definitions
Adjustable Speed Drive.
A combination of the power converter, motor, and motor mounted auxiliary devices such as encoders, tachometers, thermal switches and detectors, air blowers, heaters, and vibration sensors.
Adjustable-Speed Drive System.
An interconnected combination of equipment that provides a means of adjusting the speed of a mechanical load coupled to a motor. A drive system typically consists of an adjustable speed drive and auxiliary electrical apparatus. "
Is a Variable Frequency Drive the same thing as an Adjustable Speed Drive? I am talking AC motors. We have a couple conveyors at work that are DC and the speed is adjustable. We also have some AC mtr driven roller-beds that we can adjust the speed on - They are controlled by VFD,s. Any information or explanation would be appreciated. I do not see the words Variable Frequency Drive in the NEC.
"ARTICLE 100 Definitions
Adjustable Speed Drive.
A combination of the power converter, motor, and motor mounted auxiliary devices such as encoders, tachometers, thermal switches and detectors, air blowers, heaters, and vibration sensors.
Adjustable-Speed Drive System.
An interconnected combination of equipment that provides a means of adjusting the speed of a mechanical load coupled to a motor. A drive system typically consists of an adjustable speed drive and auxiliary electrical apparatus. "
Is a Variable Frequency Drive the same thing as an Adjustable Speed Drive? I am talking AC motors. We have a couple conveyors at work that are DC and the speed is adjustable. We also have some AC mtr driven roller-beds that we can adjust the speed on - They are controlled by VFD,s. Any information or explanation would be appreciated. I do not see the words Variable Frequency Drive in the NEC.
