VLT
®
6000 HVAC
118
★
= factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
MG.60.B1.02 - VLT is a registered Danfoss trade mark
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 VLT frequency con-
verter 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).
419 Setpoint 2 (SETPOINT 2)
Value:
Ref
MIN
- Ref
MAX
★
0.000
Function:
Setpoint 2
is used in closed loop as the reference to
compare the feedback values with. See description of
parameter 417
Feedbackfunction
.
The setpoint can be offset with digital, analog or bus
signals, see reference handling.
Used in
Closed loop
[1] parameter 100
Configura-tion
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 VLT frequency converter is to reduce the output
frequency in case the feedback signal increases,
select
Normal
[0].
If the VLT frequency converter is to increase the
output frequency in case the feedback signal
increases, select
Inverse
[1].