Danfoss VLT 8000 AQUA series, Руководство по эксплуатации, Страница: 142 / 206

VLT
®
8000 AQUA
The setpoint can be offset with digital, analog or
bus signals, see reference handling .
Used in Closed loop [1] parameter 100 Configuration
and only if 2-zone minimum/maximum is selected
in parameter 417 Feedbackfunction .
Description of choice:
Set the required value. The process unit is selected
in parameter 415 Process units .
420 PID normal/inverse control
(PID NOR/INV. CTRL)
Value:
✭
Normal (NORMAL) [0]
Inverse (INVERSE) [1]
Function:
It is possible to choose whether the process
regulator is to increase/reduce the output frequency
if there is a deviation between reference/setpoint
and the actual process state.
Used in Closed loop [1] (parameter 100).
Description of choice:
If the frequency converter is to reduce the
output frequency in case the feedback signal
increases, select Normal [0].
If the frequency converter is to increase the
output frequency in case the feedback signal
increases, select Inverse [1].
421 PID anti windup
(PID ANTI WINDUP)
Value:
Off (DISABLE) [0]
✭
On (ENABLE) [1]
Function:
It is possible to choose whether the process regulator
is to continue regulating on a deviation even if it is not
possible to increase/reduce the output frequency.
Used in Closed loop [1] (parameter 100).
Description of choice:
The factory setting is On [1], which means that
the integration link is adjusted to the actual output
frequency if either the current limit, the voltage limit
or the max./min. frequency has been reached. The
process regulator will not be engaged again, until either
the deviation is zero or its prefix has changed.
Select Off [0] if the integrator is to continue
integrating to the deviation even if it is not possible
to remove the deviation by regulation.
NB!:
If Off [0] is selected, it will mean that when
the deviation changes its prefix, the integrator
will first have to integrate down from the level
obtained as a result of the former error, before any
change to the output frequency occurs.
422 PID start-up frequency
(PID START VALUE)
Value:
f
MIN
-f
MAX
(parameter 201 and 202)
✭
0 Hz
Function:
When the start signal comes, the frequency converter
will react in the form of Open loop [0] following the
ramp. Only when the programmed start frequency
has been obtained, will it change over to Closed
loop [1]. In addition, it is possible to set a frequency
that corresponds to the speed at which the process
normally runs, which will enable the required process
conditions to be reached sooner.
Used in Closed loop [1] (parameter 100).
Description of choice:
Set the required start frequency.
NB!:
If the frequency converter is running at the
current limit before the desired start frequency
is obtained, the process regulator will not be
activated. For the regulator to be activated anyway, the
start frequency must be lowered to the required output
frequency. This can be done during operation.
NB!:
PID start frequency is always applied in
clockwise direction.
423 PID proportional gain
(PID PROP. GAIN)
Value:
0.00 - 10.00 ✭
0.01
Function:
The proportional gain indicates the number of times
the deviation between the reference/setpoint and
the feedback signal is to be applied.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
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