Danfoss VLT 2800 Manual page 102

427 U3 voltage
(U3 voltage)
Value:
0.0 - 999.0 V
Function:
See parameter 423 U1 voltage.
Description of choice:
Set the output voltage (U3) that is to match the third
output frequency (F3), parameter 428 F3 frequency .
428 F3 frequency
(F3 frequency)
Value:
Par. 426 F2 frequency -
1000 Hz
Function:
See parameter 423 U1 voltage.
Description of choice:
Set the output frequency (F3) that is to match the third
output voltage (U3), parameter 427 U3 voltage .
NB!
Parameters 437-444 are only used if in
parameter 100 Configuration a selection
has been made of Process regulation,
closed loop. [3].
437 Process PID normal/inverse control
(proc no/inv ctrl)
Value:
Normal (normal)
Inverse (inverse)
Function:
It is possible to choose whether the process regulator
is to increase/reduce the output frequency if there is a
deviation between the reference/setpoint and the ac-
tual process mode.
Description of choice:
If the frequency converter is to reduce the output fre-
quency in case the feedback signal increases, select
Normal [0].If the frequency converter is to increase the
output frequency in case the feedback signal increa-
ses, select Inverse [1].
= factory setting, () = display text, [] = value for use in communication via serial communication port
102
par. 103
It is possible to select whether the process regulator is
to continue regulating on a deviation even if it is not
possible to increase/reduce the output frequency.
The factory setting is Enable [1], which means that the
integration link is initialised in relation to the actual out-
put frequency if either the current limit, the voltage limit
Par. 104 Motor fre-
or the max./min. frequency has been reached. The
quency
process regulator will not engage again until either the
error is zero or its sign has changed. Select Disable [0]
if the integrator is to continue integrating on the devi-
ation, even if it is not possible to remove the fault by
such control.
[0]
[1]
When the start signal comes, the frequency converter
will react in the form of Open loop and will not change
to Closed loop until the programmed start frequency is
reached. This makes it possible to set a frequency that
corresponds to the speed at which the process nor-
mally runs, which will enable the required process
conditions to be reached sooner.
Set the required start frequency.
438 Proces PID anti windup
(proc anti windup)
Value:
Not active (DISABLE)
Active (ENABLE)
Function:
Description of choice:
NB!
If Disable [0] is selected, it will mean that
when the deviation changes its sign, the
integrator will first have to integrate down
from the level obtained as a result of the
former error, before any change in output
frequency occurs.
439 Process PID start frequency
(PROC START VALUE)
Value:
f - f (parameter
MIN MAX
201/202)
Function:
Description of choice:
MG.27.E2.02 - VLT is a registered Danfoss trademark
[0]
[1]
Par. 201 Output fre-
quency, low limit, f
MIN