be shown as one unit by selecting
Reference [unit]
. The sum of the ex-
ternal references can be shown on the LCP control unit's display as a %
of the area from
Minimum reference, Ref
MIN
to
Maximum reference,
Ref
MAX
. Select
External reference, %
[25] in parameters 009-012
Display
readout
if a readout is desired.
It is possible to have both references and external references simultane-
ously. In parameter 214
Reference function
a selection can be made to
determine how preset references should be added to the external refer-
ences.
There is also an independent local reference in parameter 003
Local ref-
erence
, in which the resulting reference is set using the [+/-] keys. When
the local reference has been selected, the output frequency range is limi-
ted 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
Con-
figuration.
203
Reference range
Value:
Min. reference - Max reference (min - max)
[0]
-Max. reference - Max. reference
(-max - +max)
[1]
Function:
In this parameter you select whether the reference signal must be posi-
tive or whether it can be both positive and negative. The minimum limit
may be a negative value, unless in parameter 100
Configuration
a se-
lection has been made of
Speed regulation, closed loop
. You should select
Min ref. - Max. ref.
[0], if
Process regulation, closed loop
[3] has been
selected in parameter 100
Configuration
.
Description of choice:
Select the required range.
204
Minimum reference, Ref
MIN
Value:
Par. 100
Config.
=
Open loop
[0].-100,000.000 - par.
205 Ref
MAX
0.000 Hz
Par. 100
Config.
=
Closed loop
[1]/[3].-Par. 414
Min-
imum 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 in parameter 100
Configuration
,
Speed regula-
tion, closed loop
[1] or
Process regulation, closed loop
[3] is selected, the
minimum reference is limited by parameter 414
Minimum feedback
. Min-
imum reference is ignored if the local reference is active.
The reference unit can be defined from the following table:
Par. 100
Configuration
Unit
Open loop [0]
Hz
Speed reg, closed loop [1]
rpm
Process reg, closed loop [3]
Par. 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:
Par. 100
Config.
=
Open loop
[0].Par. 204
Ref
MIN
-
1000.000 Hz
50.000 Hz
Par. 100
Config.
=
Closed loop
[1]/[3]. Par. 204
Ref
MIN
- Par. 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
Closed loop
[1]/[3] is selected in parameter
100
Configuration
the maximum reference cannot exceed the value in
parameter 415
Maximum feedback
.
Maximum reference is ignored if the local reference is active.
The reference unit can be defined from the following table:
4 Programming
VLT
®
Decentral FCD 300 Design Guide
80
MG.90.S1.02 - VLT
®
is a registered Danfoss trademark
4
