Danfoss VLT FCD 322 Design Guide

VLT
®
FCD Series
■ Load and Motor
■ Configuration
Selection of configuration and torque characteristics
has an effect on which parameters can be seen in
the display. If Open loop [0] is selected, all parame-
ters relating to PID regulation will be filtered out.
This means that the user only sees the parameters
that are relevant for a given application.
100
100 Configuration
(CONFIGURATION)
Value:
✭Speed regulation, open loop
(SPEED OPEN LOOP)
[0]
Speed regulation, closed loop
(SPEED CLOSED LOOP)
[1]
Process regulation, closed loop
(PROCESS CLOSED LOOP)
[3]
Function:
This parameter is used to select the configuration to
which the frequency converter is to be adapted. This
makes adaptation to a given application simple,
since the parameters not used in a given configura-
tion are hidden (not active).
Description of choice:
If Speed regulation, open loop [0] is selected, nor-
mal speed control is obtained (without feedback
signal) with automatic load and slip compensation to
ensure a constant speed at varying loads. Compen-
sations are active, but may be disabled in parameter
134 Load compensation and parameter 136 Slip
compensation as required.
If Speed regulation, closed loop [1] is selected, bet-
ter speed accuracy is obtained. A feedback signal
must be added, and the PID regulator must be set in
parameter group 400 Special functions.
If Process regulation, closed loop [3] is selected, the
internal process regulator is activated to enable pre-
cise regulation of a process in relation to a given
process signal. The process signal can be set to the
relevant process unit or as a percentage. A feed-
back signal must be added from the process and the
process regulator must be set in parameter group
400 Special functions.
101
101 Torque characteristic
(TORQUE CHARACT)
Value:
✭Constant torque
(CONSTANT TORQUE)
[1]
Variable torque low
(TORQUE: LOW)
[2]
Variable torque medium
(TORQUE: MED)
[3]
Variable torque high
(TORQUE: HIGH)
[4]
Variable torque low with CT start
(VT LOW CT START)
[5]
Variable torque medium with CT start
(VT MED CT START)
[6]
Variable torque high with CT start
(VT HIGH CT START)
[7]
Special motor mode
(SPECIAL MOTOR MODE)
[8]
✭ CT = Constant torque
Function:
This parameter enables a choice of principle for
adaptation of the U/f ratio of the frequency converter
to the torque characteristic of the load. See par. 135
U/f ratio.
Description of choice:
If Constant torque [1] is selected, a load-dependent
U/f characteristic is obtained, in which output voltage
and output frequency are increased at increasing
loads in order to maintain constant magnetization of
the motor.
Select Variable torque low [2], Variable torque
medium [3] or Variable torque high [4], if the load is
square (centrifugal pumps, fans).
Variable torque - low with CT start [5], - medium with
CT start [6] or high with CT start [7], are selected if
you need a greater breakaway torque than can be
achieved with the three first characteristics.
NB!:
Load and slip compensation are not active
if variable torque or special motor mode have
been selected.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.04.A1.02 - VLT is a registered Danfoss trade mark
56

Danfoss VLT FCD 322 Specifications

General

Brand	Danfoss
Model	VLT FCD 322
Category	DC Drives
Language	English