Feedback And Reference Handling - Danfoss VLT DriveMotor FCP 106 Design Manual

Product Overview

2.5 Feedback and Reference Handling

2.5.1 Reference Handling
2 2
Details for open loop and closed loop operation.
Internal resource
P 3-14 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%
P 3-15 Reference 1
resource
No function
Analog reference
±200%
Pulse reference
±200%
Local bus reference
±200%
P 3-16 Reference 2
resource
No function
Analog reference
±200%
Pulse reference
±200%
Local bus reference
±200%
P 3-17 Reference 3
resource
No function
Analog reference
±200%
Pulse reference
±200%
Local bus reference
±200%
Illustration 2.16 Block Diagram Showing Remote Reference
The remote reference comprises:
•
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 drive.
Select the active preset reference using digital inputs or
the serial communications bus. The reference can also be
supplied externally, most commonly from an analog input.
Select this external source via the 3 reference source
parameters:
18
®
VLT DriveMotor FCP 106
Relative scaling reference
Input command:
preset ref bit0, bit1, bit2
P 3-10 Preset
reference
±100%
Y
Parameter choice:
X
Reference resource 1,2,3
+
±200%
+
±200%
P 16-50 External reference in %
Danfoss A/S © 12/2018 All rights reserved.
P 4 - 12 Motor
Speed low
limit (Hz)
P 4 - 14 Motor
Speed high
limit (Hz)
Input command:
freeze reference
Relative
maxRefPCT
reference
=
±200%
minRefPct
X+X*Y/100
min
ref
±100%
Freeze
reference &
increase/
decrease
reference
Input commands:
Speed up/speed down
•
Parameter 3-15 Reference 1 Source
•
Parameter 3-16 Reference 2 Source
•
Parameter 3-17 Reference 3 Source
Sum all reference resources and the bus reference to
produce the total external reference. Select the external
reference, the preset reference, or the sum of the 2 as the
active reference. Finally, this reference can be scaled by
using parameter 3-14 Preset Relative Reference.
The scaled reference is calculated as follows:
Reference = X + X ×
Speed open
P 1-00
loop
Con guration
mode
or rpm
Scale to
Hz
-max
ref
Process
control
Scale to
process
unit
±200%
Feedback
handling
P 16-02 Remote
Reference in %
P 20 - 12
Reference
/Feedback
unit
Y
100
Remote
reference/
setpoint
P 16-01
Reference
[Unit]
MG03M302