Specifications

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2.8.9 Reference Handling

Details for Open Loop and Closed Loop operation

Preset relative ref.

Preset ref.Ref. 1 source

Ext. closed loop outputs

No function

Analog inputs

Frequency inputs

No function

Freeze ref.

Speed up/ speed down

ref.

Remote

Ref. in %

[1]

[2]

[3]

[4]

[5]

[6]

[7]

Open loop

Freeze ref.

increase/

decrease

ref.

Scale to

RPM,Hz

or %

Scale to

Closed

loop

unit

Relative

X+X*Y

/100

DigiPot

max ref.

min ref.

[0]

o

Conguration mode

Closed loop

Input command:

Ref. function

Ref. Preset

Input command:

Preset ref. bit0, bit1, bit2

External

reference

in %

Bus

reference

Open loop

From Feedback Handling

Setpoint

Conguration mode

Input command:

Digipot ref.

Increase

Decrease

Clear

DigiPot

Closed loop

Ref. 2 sourceRef. 3 source

Analog inputs

Frequency inputs

Analog inputs

Frequency inputs

Ext. closed loop outputs

P 3-10P 3-15P 3-16P 3-17

P 1-00

P 3-14

±100%

130BA357.12

P 3-04

±200%

P 1-00

±200%

0/1



Illustration 2.29 Block Diagram Showing Remote Reference

The remote reference is comprised of:

•

Preset references.

•

External references (analog inputs, pulse

frequency inputs, digital potentiometer inputs

and serial communication bus references).

•

The Preset relative reference.

•

Feedback controlled setpoint.

Up to 8 preset references can be programmed in the

frequency converter. The active preset reference can be

selected using digital inputs or the serial communications

bus. The reference can also be supplied externally, most

commonly from an analog input. This external source is

selected by one of the 3 Reference Source parameters

(3-15 Reference 1 Source, 3-16 Reference 2 Source and

3-17 Reference 3 Source). Digipot is a digital potentiometer.

This is also commonly called a Speed Up/Speed Down

Control or a Floating Point Control. To set it up, one digital

input is programmed to increase the reference, while

another digital input is programmed to decrease the

reference. A third digital input can be used to reset the

Digipot reference. All reference resources and the bus

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