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P038, When, Basic program group – Rockwell Automation 22D PowerFlex 40P User Manual, FRN 3 User Manual

Page 58: Continued), P038 [speed reference

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3-12

Programming and Parameters

Basic Program Group

(continued)

P038 [Speed Reference]

Related Parameter(s):

b001

,

b002

,

b012

,

b020

,

b021

,

P039

,

P040

,

A051

-

A054

,

A069

,

A070

-

A077

,

A110

,

A111

,

A112

,

A113

,

A123

,

A132

,

A140

-

A147

,

A150

-

A157

Sets the source of the speed reference to the drive.
The drive speed command can be obtained from a number of different sources. The source is
normally determined by

P038

[Speed Reference]. However, when

A051

-

A054

[Digital Inx Sel] is set

to option 2, 4, 5, 6, 11, 12, 13, 14, 15 and the digital input is active, or if

A132

[PID Ref Sel] is not set

to option 0, the speed reference commanded by

P038

[Speed Reference] will be overridden. Refer to

the flowchart on

page 1-27

for more information on speed reference control priority.

Options

1 “InternalFreq”

Internal frequency command from

A069

[Internal Freq]. Must

be set when using MOP function.

2 “0-10V Input”

External frequency command from the 0-10V or ±10V analog
input or remote potentiometer.

3 “4-20mA Input”

External frequency command from the 4-20mA analog input.

4 “Preset Freq”

External frequency command as defined by

A070

-

A077

[Preset Freq x] when

A051

-

A054

[Digital Inx Sel] are

programmed as “Preset Frequencies” and the digital inputs
are active.

5 “Comm Port” (Default)

External frequency command from the communications port.
Refer to Appendix C for details.

6 “Stp Logic”

External frequency command as defined by

A070

-

A077

[Preset Freq x] and

A140

-

A147

[Stp Logic x]. If Step

Logic-based positioning control is desired, select option 9
“Positioning” and adjust

E222

[Positioning Mode].

7 “Anlg In Mult”

External frequency command as defined by the product of the
analog inputs (shown in

b020

[Analog In 0-10V] and

b021

[Analog In 4-20mA]).
[Analog In 0-10V]

×

[Analog In 4-20mA] = Speed Command

Example: 100%

×

50% = 50%

8 “Encoder”

External frequency command directly from encoder or pulse
train input. Use

E216

[Motor Fdbk Type] to select encoder

type.

9 “Positioning”

External position as defined by

E222

and

E230

-

E245

. Refer

to

Appendix F

for detailed information on positioning.