71 Frequency Converters dynamic response, the power components and hardware may be upgraded as much as two, three or four times the power components in a FC to ensure available current and torque. 2.7.6. Control Conclusions In conclusion, all control methods are primarily handled by the software. The more dynamic the motor control needs to be, the more complex the control algorithm required. A similar principle applies for initial use of a FC. Initial use of a simple FC does not involve a great deal of programming. In most cases, all you have to do is enter the motor data.
However, for applications that require a fl ux vector control or critical applications like hoists, more complex programming is required, right from initial use. Due to the fact that the control is mainly a software issue, many manufacturers have implemented several control methods in their units, for example U/f, space vector, or fi eld-oriented control. Parameters are needed to switch from one control method to another, for example from space vector control to the fl ux vector method. Pop-up menus help the operator to set the parameters needed for each control method, in order to meet the application demands.
2.8 Danfoss Control Principles A general overview of the standard current control principles for Danfoss FC’s is illustrated in Fig. 2.24 Basic principles of current standard frequency converters from Danfoss. Fig 2.24 Basic principles of current standard frequency converters from Danfoss