Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario descargar pdf (Pagina 154)

Scale Blocks

154 Rockwell Automation Publication PFLEX-RM001H-EN-P - June 2013

Scale Blocks See also Analog Scaling on page 22 and page 32.

Scale blocks are used to scale a parameter value. [Scalex In Value] is

linked to the parameter that you wish to scale. [Scalex In Hi] determines the high

value for the input to the scale block. [Scalex Out Hi] determines the

corresponding high value for the output of the scale block. [Scalex In Lo]

determines the low value for the input to the scale block. [Scalex Out Lo]

determines the corresponding low value for the output of the scale block. [Scalex

Out Value] is the resulting output of the scale block.

There are (3) ways to use the output of the scale block:

1. A linkable destination parameter can be linked to [Scalex Out Value]. See

Example Configuration #1

2. [Analog Outx Sel] can be set to:

– 20, “Scale Block1”

– 21, “Scale Block2”

– 22, “Scale Block3”

– 23, “Scale Block4”

Note that when the Analog Outputs are set to use the scale blocks, the [Scale x

Out Hi] and [Scale x Out Lo] parameters are not active. Instead, [Analog

Outx Hi] and [Analog Outx Lo] determine the scaling for the output of the

scale block. See Example Configuration #2

3. [PI Reference Sel] and [PI Feedback Sel] can also use the output of the scale

block by setting them to:

– 25, “Scale Block1 Out”

– 26, “Scale Block2 Out”

Note that when [PI Reference Sel] and [PI Feedback Sel] are set to use the

scale blocks, the [Scale x Out Hi] and [Scale x Out Lo] parameters are not

active. Instead, [PI Reference Hi] and [PI Reference Lo], or [PI Feedback Hi]

and [PI Feedback Lo], determine the scaling for the output of the scale block.

See Example Configuration #3

Example Configuration #1

Use the scale blocks to add a speed trim as a percentage of the speed reference

instead of as a percent of full speed. Analog In 2 will be used to provide a 0-10V

DC trim signal. For example, when the commanded speed is 800 RPM, the

maximum trim with 10V DC at Analog In 2 will be 80 RPM. If the commanded

speed is 1800 RPM the maximum trim will be 180 RPM.

Vector

Cmd Spd = 400 RPM

Cmd Spd =

800 RPM

Cmd Spd = 1200 RPM

Cmd Spd = 1

800 RPM

20 40 60 80 100 120 140 180

Preset Speed 1 (RPM)

Scale1 In Value =

Analog In2 Val (Volts)

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 213 214

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Rockwell-automation 20B PowerFlex 70, PowerFlex 700 Reference Manual Manual de usuario Pagina 154

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