function
a selection can be made to determine how preset
references should be added to the external references.
There is also an independent local reference in
parameter
003 Local reference
, in which the resulting reference is set
pressing the [+]/[-] keys. When the 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
.
The local reference unit depends on the selection in
parameter 100 Configuration
.
Illustration 4.7 Reference Handling
203
Reference range
Value:
Min. reference - Max reference (min - max)
[0]
-Max. reference - Max. reference
(-max - +max)
[1]
Function:
Select whether the reference signal must be positive or
whether it can be both positive and negative. The
minimum limit may be a negative value, unless a selection
has been made of
Speed regulation, closed loop
in
parameter 100 Configuration
. If
[3] Process regulation, closed
loop
is selected for
parameter 100 Configuration
, select
[0]
Min ref. - Max. ref.
.
Description of choice:
Select the required range.
204
Minimum reference, Ref
MIN
Value:
Parameter 100
Config.
=
Open loop
[0].-100,000.000 - par. 205 Ref
MAX
0.000 Hz
Parameter 100 Config.
=
[1]/[3] Closed
loop
.
Parameter 414 Minimum feedback
-
par.
205 Ref
MAX
0.000
rpm/par 416
Function:
Minimum reference is an expression of the minimum
possible value of the total of all references. If
[1] Speed
regulation, closed loop
or
[3] Process regulation, closed loop
is selected in
parameter 100 Configuration
, the minimum
reference is limited by
parameter 414 Minimum feedback
.
Minimum reference is ignored if the local reference is
active.
The reference unit is defined in
Parameter 100 Configuration
Unit
[0] Open loop
Hz
[1] Speed reg, closed loop
RPM
[3] Process reg, closed loop
Parameter 416
Description of choice:
The minimum reference is preset if the motor has to run at
a minimum speed, regardless of whether the resulting
reference is 0.
205
Maximum reference, Ref
MAX
Value:
Parameter 100 Config.
=
[0] Open
loop
.
Parameter 204 Ref
MIN
- 590.000 Hz
50.000
Hz
Parameter 100 Config.
=
[1]/[3] Closed
loop
.
Parameter 204 Ref
MIN
- Parameter
415 Max. feedback
50.000
rpm/par 416
Function:
The maximum reference gives the highest value that can
be assumed by the sum of all references. If
[1]/[3] Closed
loop
is selected in
parameter 100 Configuration
the
Programming
Design Guide
78
Danfoss A/S © Rev. May/2014 All rights reserved.
MG27E402
4
4
