Danfoss VLT 6000 HVAC Series User Manual

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 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 fre-
quency in case the feedback signal increases, select
Normal [0].
If the frequency converter is to increase the output fre-
quency 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 in-
tegration 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 regu-
lator will not be engaged again, until either the devia-
tion 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 inte-
grator will first have to integrate down from
the level obtained as a result of the former
error, before any change to the output fre-
quency 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 corre-
sponds 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 fre-
quency 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 oper-
ation.
NB!
PID start frequency is always applied in
clockwise direction.
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.61.B5.02 - VLT
®
is a registered Danfoss trademark 151
Programming

Danfoss VLT 6000 HVAC Series Specifications

General

Brand	Danfoss
Model	VLT 6000 HVAC Series
Category	DC Drives
Language	English