MG.20.B6.02 – VLT is a registered Danfoss trademark
VLT
®
2000 Series
66
119 FF factor (FEED FWD FACTR)
Value:
0 - 500% ✭ 100%
Function:
This parameter is used in connection with a PI
controller. The FF factor sends a large or small part of
the reference signal around the PI controller so that
the PI controller only affects part of the control signal.
Any change of the setpoint will therefore directly affect
the motor speed. The FF factor gives high dynamics
at changes of the setpoint and less overswing.
Description:
You can choose the required percentage value in the
interval f
MIN
- f
MAX.
Choose a value above 100% if the setpoint variations
are only minor.
120 Controller range (CONTRL RANGE)
Value:
0 - ✭ 100%
Function:
The controller range (band width) limits the output
from the PI controller as a percentage of f
MAX.
Description:
You can choose a percentage value of f
MAX
. If the
controller range is reduced the speed variations will
be lower during adjustment.
Warning: The output frequency is limited by
0.9 x f
MIN
and 1.1 x f
MAX
no matter what the
band width setting is. The controller can therefore be
active without affecting the output frequency.
When the PI controller is active the output frequency
can exceed f
MAX
by 10%.
121 Proportional gain (PROPRT /L GAIN)
Value:
0.01 - 10.00 ✭ 0.01
Function:
The proportional gain indicates how many times the
deviation (between feedback signal and setpoint)
must be amplified.
Description:
Fast regulation is obtained when amplification is high.
The value can be too high, and then the process may
become unstable.
122 Integral time (INTEGRAL TIME)
Value:
0.01 - 7200 sec. ✭(OFF)
Function:
The integral time determines how long the PI control-
ler takes to regulate the signal. The integral time will
delay/dampen the signal.
Description:
Fast regulation is obtained when the integral time is
short. The value can be too short, making the process
unstable. When the integral time is long regulation is
slow. “Off” means that the function is not active.
125 FB-factor (FEEDBACK SCALE)
Value:
0 - 500% ✭ 100%
Function:
The FB factor is used if the transmitter cannot be
selected optimally to the scaling range of the input
signals.
Description:
This parameter is only used if the feedback signal in
parameter 114 is not of a suitable level. If you choose
100% the feedback signal is not changed.
✭ = Factory setting. Text in ( ) = Display text. The figures in [ ] are used in bus communication.
Description of parameters
■
■
■
■
■
To Next Page
Loading...
Need help?
General