The remote reference is calculated once every scan
interval and initially consists of two types of reference
inputs:
1.
X (the external reference): A sum (see
3-04 Reference Function
) of up to four externally
selected references, comprising any combination
(determined by the setting of
3-15 Reference
Resource 1
,
3-16 Reference Resource 2
and
3-17 Reference Resource 3
) of a fixed preset
reference (
3-10 Preset Reference
), variable analog
references, variable digital pulse references, and
various serial bus references in whatever unit the
frequency converter is controlled ([Hz], [RPM],
[Nm] etc.).
2.
Y- (the relative reference): A sum of one fixed
preset reference (
3-14 Preset Relative Reference
)
and one variable analog reference (
3-18 Relative
Scaling Reference Resource
) in [%].
The two types of reference inputs are combined in the
following formula: Remote reference=X+X*Y/100%. If
relative reference is not used
3-18 Relative Scaling Reference
Resource
must be set to
No function
and to
0%
. The
catch
up/slow down
function and the
freeze reference
function
can both be activated by digital inputs on the frequency
converter. The functions and parameters are described in
the Programming Guide.
The scaling of analog references are described in
parameter groups 6-1* and 6-2*, and the scaling of digital
pulse references are described in parameter group 5-5*.
Reference limits and ranges are set in parameter group
3-0*.
2.3.1 Reference Limits
3-00 Reference Range
,
3-02 Minimum Reference
and
3-03 Maximum Reference
together define the allowed range
of the sum of all references. The sum of all references are
clamped when necessary. The relation between the
resulting reference (after clamping) is shown in
and the sum of all
references is shown in
.
Resulting reference
Sum of all
references
Forward
Reverse
P 3-00 Reference Range= [0] Min-Max
130BA184.10
-P 3-03
P 3-03
P 3-02
-P 3-02
Illustration 2.10 Reference Range=[0] Min-Max
P 3-00 Reference Range =[1]-Max-Max
Resulting reference
Sum of all
references
-P 3-03
P 3-03
130BA185.10
Illustration 2.11 Reference Range=[1] -Max-Max
The value of
3-02 Minimum Reference
can not be set to less
than 0, unless
1-00 Configuration Mode
is set to
[3] Process
.
In that case the following relations between the resulting
reference (after clamping) and the sum of all references is
as shown in
.
130BA186.11
P 3-03
P 3-02
Sum of all
references
P 3-00 Reference Range= [0] Min to Max
Resulting reference
Illustration 2.12 Sum of all References
Product Overview
VLT
®
Decentral Drive FCD 302
18
MG04H102 - VLT
®
is a registered Danfoss trademark
2
2