Danfoss VLT 6000 HVAC Series User Manual

Reference handling
Reference handling is shown in the block diagram un-
derneath.
The block diagram shows how a change in a param-
eter can affect the resulting reference.
Parameters 203 to 205 Reference handling, minimum
and maximum reference and parameter 210 Reference
type define the way reference handling can be carried
out. The mentioned parameters are active both in a
closed and in an open loop.
Remote references are defined as:
• External references, such as analog inputs
53, 54 and 60, pulse reference via terminal
17/29 and reference from serial communica-
tion.
• Preset references.
The resulting reference can be shown in the display by
selecting Reference [%] in parameters 007-010 Dis-
play readout and in the form of a unit by selecting
Resulting reference [unit]. See the section on Feed-
back handling in connection with a closed loop.
The sum of the external references can be shown in
the display as a percentage of the range from Minimum
reference, Ref
MIN
to Maximum reference, Ref
MAX
. Se-
lect External reference, % [25] in parameters 007-010
Display readout if a readout is required.
It is possible to have both preset references and ex-
ternal references at the same time. In parameter 210
Reference type a choice is made of how the preset
references are to be added to the external references.
Furthermore, an independent local reference exists,
where the resulting reference is set by means of the
[+/-] keys. If local reference has been selected, the
output frequency range is limited by parameter 201
Output frequency low limit, f
MIN
and parameter 202
Output frequency high limit, f
MAX
.
NB!
If the local reference is active, the fre-
quency converter will
always be in Open
loop [0], regardless of the choice made in
parameter 100 Configuration.
The unit of the local reference can be set either as Hz
or as a percentage of the output frequency range. The
unit is selected in parameter 011 Unit of local reference.
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
116 MG.61.B5.02 - VLT
®
is a registered Danfoss trademark

Danfoss VLT 6000 HVAC Series Specifications

General

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