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].
438 Proces PID anti windup
(proc anti windup)
Value:
Not active (DISABLE) [0]
Active (ENABLE) [1]
Function:
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.
Description of choice:
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
or the max./min. frequency has been reached. The
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.
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
MIN
- f
MAX
(parameter
201/202)
Par. 201 Output fre-
quency, low limit, f
MIN
Function:
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.
Description of choice:
Set the required start frequency.
NB!
If the frequency converter is running a the
current limit before the required start fre-
quency is obtained, the process regulator
will not be activated. For the regulator to
be activated anyway, the start frequency
must be lower to the required output fre-
quency. This can be done during opera-
tion.
440 Proces PID proportioanl gain
(PROC. PROP. GAIN)
Value:
0.0 - 10.00
0.01
Function:
The proportional gain indicates the number of times
the deviation between the setpoint and the feedback
signal is to be applied.
Description of choice:
Quick regulation is obtained by a high gain, but if the
gain is too high, the process may become unstable due
to overshoot.
441 Process PID integration time
(PROC. INTEGR. T.)
Value:
0.01 - 9999.99 (OFF)
OFF
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.A2.02 - VLT
®
is a registered Danfoss trademark 49
Programming
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