FC101 Design Guide

ManualsBrandsSystemair ManualsElectrical accessories VentilationFC101-4kW/9,1A-IP20, 25/20m - frequency inverter 400V, no display, controller

3.2.6 Reference Handling

Details for open-loop and closed-loop operation.

Speed open

loop

mode

Input command:

freeze reference

Process

control

Scale to

process

unit

Remote

reference/

setpoint

±200%

Feedback

handling

Remote

reference in %

maxRefPCT

minRefPct

min-max ref

Freeze

reference &

increase/

decrease

reference

±100%

Input commands:

Speed up/speed down

±200%

Relative

reference

X+X*Y/100

±200%

External reference in %

±200%

Parameter choise:

Reference resource 1,2,3

±100%

Preset reference

Input command:

preset ref bit0, bit1, bit2

Relative scalling reference

Intern resource

Preset relative reference

±100%

Preset reference 0 ±100%

Preset reference 1 ±100%

Preset reference 2 ±100%

Preset reference 3 ±100%

Preset reference 4 ±100%

Preset reference 5 ±100%

Preset reference 6 ±100%

Preset reference 7 ±100%

External resource 1

No function

Analog reference

±200 %

Local bus reference

±200 %

Pulse input reference

±200 %

Pulse input reference

±200 %

Pulse input reference

±200 %

External resource 2

No function

Analog reference

±200 %

Local bus reference

±200 %

External resource 3

No function

Analog reference

±200 %

Local bus reference

±200 %

130BE842.10

Figure 3.21 Block Diagram Showing Remote Reference

The remote reference consists of:

•

Preset references.

•

External references (analog 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 1 of the 3 reference source parameters

(parameter 3-15 Reference 1 Source,

parameter 3-16 Reference 2 Source, and

parameter 3-17 Reference 3 Source). All reference resources

and the bus reference are added to produce the total

external reference. The external reference, the preset

reference, or the sum of the 2 can be selected to be the

active reference. Finally, this reference can by be scaled

using parameter 3-14 Preset Relative Reference.

The scaled reference is calculated as follows:

Reference = X + X × 

100

Where X is the external reference, the preset reference or

the sum of these and Y is parameter 3-14 Preset Relative

Reference in [%].

If Y, parameter 3-14 Preset Relative Reference, is set to 0%,

the reference is not

aected by the scaling.

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HVAC Basic Drive FC 101