Rockwell-automation 20-COMM-M Modbus/TCP Adapter Manual de usuario descargar pdf (Pagina 42)

4-6 Using Modbus/TCP Function Codes

20-COMM-M Modbus/TCP Adapter User Manual

Publication 20COMM-UM014C-EN-P

Table 4.F Reference Registers

The Reference value is a scaled engineering value; it is NOT in Hertz or

RPM. The Reference uses a “32767” scale. The “32767” endpoint of the

scale is equal to the value of parameter 55 - [Maximum Freq], which has a

default value of 130 Hz. For all PowerFlex 70/700 drives, default scaling is

0…15123 which is equal to 0…60.0 Hz. This is based on the formula

shown below. Reference scaling is limited by drive parameter 82 -

[Maximum Speed]. If the default value of 60 Hz. for parameter 82 -

[Maximum Speed] is changed, the speed Reference scaling also changes. To

determine Reference scaling, use:

(Parameter 82 / Parameter 55) * 32767 = Scaling

Using parameter 82 and 55 default values, speed Reference scaling is:

(60 Hz / 130 Hz) * 32767 = 15123

Therefore, 0…15123 = 0…60.0 Hz.

If parameter 82 - [Maximum Speed] is changed to 90 Hz, then:

(90 Hz / 130 Hz) * 32767 = 22685

Therefore, 0…22685 = 0…90.0 Hz.

A graphic representation of this Reference scaling is shown below:

For PowerFlex 70 EC drives (firmware v2.xxx or higher) or PowerFlex 700

VC drives (firmware v3.xxx or higher), parameter 298 - [DPI Ref Select]

was added to simplify scaling for the speed Reference. When parameter 298

- [DPI Ref Select] is set to its default “0” (Max Freq), the speed Reference

scaling is as shown above. However, when parameter 298 - [DPI Ref Select]

is set to “1” (Max Speed), the speed Reference scaling is equal to parameter

82 - [Max Speed]:

Parameter 82 = Scaling

Therefore, 0…32767 = 0…60.0 Hz.

If parameter 82 - [Maximum Speed] is changed to 90 Hz, then:

90 Hz = 32767

Address

Description Values

10003

(1)

For a 16-bit Reference, you must write the complete 32-bit value.

Reference Lo Bit 0…15 of 32-bit Reference or the whole 16-bit Reference

10004 Reference Hi Bit 16…31 of 32-bit Reference

0 Hz

Par. 55 - [Maximum Freq]

Par. 82 - [Maximum Speed]

130 Hz

90 Hz

60 Hz

327672268515123

Scaling = (Parameter 82 / Parameter 55) * 32767

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 97 98

Comentarios a estos manuales

Sin comentarios

Rockwell-automation 20-COMM-M Modbus/TCP Adapter Manual de usuario Pagina 42

Comentarios a estos manuales

Relacionado con productos y manuales para Equipo Rockwell-automation 20-COMM-M Modbus/TCP Adapter