Danfoss VLT 6000 HVAC User Manual

VLT
®
6000 HVAC
89MG.60.B1.02 - VLT is a registered Danfoss trade mark
★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
Programming
■■
■■
■ Reference handling
Reference handling is shown in the block diagram
underneath.
The block diagram shows how a change in a
parameter 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 analogue inputs 53,
54 and 60, pulse reference via terminal 17/29 and
reference from serial communication.
• Preset references.
The resulting reference can be shown in the display
by selecting Reference [%] in parameters 007-010
Display readout and in the form of a unit by selecting
Remote reference [unit].
See the section on Feedback handling in connection
with a closed loop on page 115.
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
. Select External reference, % [25] in parameters
007-010 Display readout if a readout is required.
It is possible to have both preset references and
external 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 VLT
frequency 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.

Danfoss VLT 6000 HVAC Specifications

General

Brand	Danfoss
Model	VLT 6000 HVAC
Category	DC Drives
Language	English