Danfoss VLT AutomationDrive FC 361 Programming Guide

7-45 Process PID Feed Fwd Resource
Option: Function:
[0] * No function Select which frequency converter
input should be used as the feed-
forward factor. The factor is added
to the output of the PID controller.
This increases dynamic
performance.
[1] Analog Input
53
[2] Analog Input
54
[7] Frequency
input 29
[8] Frequency
input 33
[11] Local bus
reference
[32] Bus PCD Selects a eldbus reference
congured by
parameter 8-02 Control Word Source.
Change parameter 8-42 PCD Write
Conguration for the bus used to
make the feed forward available in
parameter 7-48 PCD Feed Forward.
Use index 1 for feed forward [748]
(and index 2 for reference [1682]).
7-46 Process PID Feed Fwd Normal/ Inv. Ctrl.
Option: Function:
[0] * Normal Select [0] Normal to set the feed-
forward factor to treat the FF
resource as a positive value.
[1] Inverse Select [1] Inverse to treat the feed-
forward resource as a negative
value.
7-48 PCD Feed Forward
Range: Function:
0* [0 - 65535] This parameter contains the value
of parameter 7-45 Process PID Feed
Fwd Resource [32] Bus PCD.
7-49 Process PID Output Normal/ Inv. Ctrl.
Option: Function:
[0] * Normal Select [0] Normal to use the
resulting output from the process
PID controller as is.
[1] Inverse Select [1] Inverse to invert the
resulting output from the process
PID controller. This operation is
performed after the feed-forward
factor is applied.
4.8.5 7-5* Ext. Process PID Ctrl.
This parameter group is only used if parameter 1-00 Cong-
uration Mode is set to [7] Extended PID speed CL.
7-50 Process PID Extended PID
Option: Function:
[0] Disabled Disable the extended parts of the
process PID controller.
[1] * Enabled Enable the extended parts of the
PID controller.
7-51 Process PID Feed Fwd Gain
Range: Function:
1* [0 - 100] The feed forward is used to obtain
the required level based on a well-
known signal available. The PID
controller then only takes care of
the smaller part of the control,
necessary because of unknown
characters. The standard feed-
forward factor in
parameter 7-38 Process PID Feed
Forward Factor is always related to
the reference, whereas
parameter 7-51 Process PID Feed Fwd
Gain has more options. In winder
applications, the feed-forward factor
is typically the line speed of the
system.
7-52 Process PID Feed Fwd Ramp up
Range: Function:
0.01 s* [0.01 - 10 s] Controls the dynamics of the feed-
forward signal when ramping up.
7-53 Process PID Feed Fwd Ramp down
Range: Function:
0.01 s* [0.01 - 10 s] Controls the dynamics of the feed-
forward signal when ramping down.
7-56 Process PID Ref. Filter Time
Range: Function:
0.001 s* [0.001 - 1 s] Set a time constant for the
reference rst-order low-pass lter.
The low-pass lter improves steady-
state performance and dampens
oscillations on the reference/
feedback signals. However, severe
ltering can be detrimental to
dynamic performance.
Parameter Descriptions VLT® AutomationDrive FC 361
92 Danfoss A/S © 03/2019 All rights reserved. MG06J202
44

Danfoss VLT AutomationDrive FC 361 Specifications

General

Brand	Danfoss
Model	VLT AutomationDrive FC 361
Category	DC Drives
Language	English