PROFIdrive

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概述

设计西门子模块总代理商|东莞PLC模块代理商

概述

PROFIdrive defines the device behavior and technique to access internal device data for electric drives connected to PROFINET and PROFIBUS – from basic frequency converters up to high-performance servo controllers.

It describes in detail the practical use of communication functions – device-to-device communication, e and clock cycle synchronization (isochronous mode) in drive applications. In addition, it specifies all device characteristics which influence interfaces connected to a controller over PROFINET or PROFIBUS. This also includes the state machine (sequence control), the encoder interface, scaling of values, definition of standard telegrams, access to drive parameters etc.

The PROFIdrive profile supports both central as well as distributed motion control concepts.

For devices and systems used in automation technology, profiles define properties and modes of behavior. This allows manufacturers and users to define common standards. Devices and systems that comply with such a cross-manufacturer profile, are interoperable on a fieldbus and, to a certain degree, can be interchanged.

A distinction is made between what are known as application profiles (general or specific) and system profiles:

• Application profiles (also device profiles) predominantly refer to devices (e.g. drives) and include an agreed selection regarding bus communication as well as specific device applications.

• System profiles describe classes of systems, including master functionality, program interfaces and integration resources.

PROFIdrive has been specified by the PROFIBUS and PROFINET International (PI) user organization, and is specified as a standard that is fit for the future through standard IEC 61800‑7.

The PROFIdrive profile tries to keep the drive interface as simple as possible and free from technology functions. As a result, referencing models as well as the functionality and performance of the PROFINET/PROFIBUS master have either no or only little influence on the drive interface.

The integration of drives into automation solutions depends very strongly on the particular drive application. In order to be able to address the complete, huge bandwidth of drive applications – from basic frequency converters up to synchronized multi-axis systems with a high dynamic performance – using just one profile, PROFIdrive defines six application classes, to which most drive applications can be assigned:西门子模块总代理商|东莞PLC模块代理商

• Class 1 – standard drives (pumps, fans, agitators, etc.)

• Class 2 – standard drives with technological functions

• Class 3 – positioning drives

• Class 4 – motion control drives with central, higher-level motion control intelligence and the patented "Dynamic Servo Control" positioning concept

• Class 5 – motion control drives with central, higher-level motion control intelligence and position setpoint interface

• Class 6 – motion control drives with distributed motion control intelligence integrated in the drives
  西门子模块总代理商|东莞PLC模块代理商
  

• 变频器 变频器特殊应用场合

• 1.如高环境温度.高开关频率.高海拔等，此时会导致变频器降容，变频器需要放大一档选择。
  2.使用变频器驱动高速电机时，由于高速电机电抗小，导出电流值增加。因此，高速电机变频器的容量略大于普通电机。
  3.驱动防爆电机时，变频器无防爆结构，应将变频器设置在危险场所以外。
  4.选择变频器时，一定要注意其防护等级是否与现场情况一致。
  其他西门子模块总代理商|东莞PLC模块代理商
  1.变频器驱动缠绕转子异步电机时，主要使用现有电机。由于纹波电流容易发生过电流跳闸，因此应选择比一般容量稍大的变频器。
  2.对于压缩机.在振动机等高转距波动负荷和油压泵有峰值负荷的前提下，应了解工频运行情况，选择额定导出电流大于其大电流的变频器。
  3.当变频器控制罗茨风机时，由于其起动电流大，在选择变频器时必须注意变频器的容量是否足够大。
  4.使用变频器驱动齿轮减速电机时，适用范围受齿轮旋转部分润滑方法的限制。不要过高转速允许值。
  5.单相电机不适合变频器驱动。
  上述就是变频器厂家为您介绍的有关变频器特殊应用场合的内容，对此还有什么不了解的，欢迎前来咨询我们的网站，我们会有专 业的人员为您讲解。

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设计

PROFIdrive defines a device model comprising function modules, which interoperate inside the device and which reflect the intelligence of the drive system. These modules have objects assigned to them which are described in the profile and are defined with respect to their functions. The overall functionality of a drive is therefore described through the sum of its parameters.

In contrast to other drive profiles, PROFIdrive defines only the access mechanisms to the parameters as well as a subset of profile parameters (approx. 30) such as the fault buffer, drive control and device identification.

All other parameters are vendor-specific which gives drive manufacturers great flexibility with respect to implementing control functions. The elements of a parameter are accessed acyclically over data records.

As a communication protocol, PROFIdrive uses DP-V0, DP-V1, and the DP-V2 expansions for PROFIBUS including the functions "Device-to-Device Communication" and "Isochronous Operation", or PROFINET IO with real-time classes RT and IRT.