Reference Function - Danfoss VLT FCD 303 Operating Instructions Manual

Description of choice:
Set the required ramp time.
212 Quick-stop ramp-down time
(Q STOP RAMP TIME)
Value:
0.02 - 3600.00 sec.
Function:
The quick-stop ramp-down time is the deceleration
time from the rated motor frequency to 0 Hz, provided
no overvoltage arises in the inverter because of
generating operation of the motor, or if the generated
current exceeds the current limit in parameter 221
Current limit I . Quick-stop is acti v ated via one of
LIM
the digital inputs or the serial communication.
Description of choice:
Set the required ramp-down time.
213 Jog frequency
(JOG FREQUENCY)
Value:
0.0 - Par. 202 Output frequency high limit, f
Function:
Jog frequency f means a fixed output frequency
JOG
that the frequency converter supplies to the motor
when the Jog function is acti v ated. Jog can be
acti v ated via the digital inputs, serial communication
or via the LCP control panel, on the condition that
this is acti v e in parameter 015 Local jog.
Description of choice:
Set the required frequency.

Reference function

The example shows how the resulting reference is
calculated when Preset references is used together
with Sum and Relati v e in parameter 214 Reference
function. The formula for the calculation of the
resulting reference can be seen in the section
entitled All about the FCD 300. See also the
drawing in Handling of references.
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.04.B7.02 - VLT is a registered Danfoss trademark
The following parameters are preset:
Par. 204 Minimum reference
Par. 205 Maximum reference
Par. 215 Preset reference
Par. 308 Term.53, Analogue input
Par. 309 Term.53, min. scaling
Par. 310 Term.53, max. scaling
3.00 sec
When parameter 214 Reference function is set to Sum
[0] one of the preset Preset references(par. 215-218) is
added to the external references as a percentage of the
reference range. If terminal 53 is applied an analogue
input voltage of 4 Volt will be the resulting reference:
Par. 214 Reference function = Sum [0]:
Par. 204 Minimum reference
Reference contribution at 4 Volt
Par. 215 Preset reference
Resulting reference
When parameter 214 Reference function is set
to Relati v e [1] the defined Preset references (par.
215-218) are added as a percentage of the total
of the present external references. If terminal
53 is applied to an analogue input voltage of 4
Volt the resulting reference will be:
Par. 214 Reference function = Relati v e [1]:
MAX
Par. 204 Minimum reference
10.0 Hz
Reference effect at 4 Volt
Par. 215 Preset reference
Resulting reference
The graph shows the resulting reference in relation to
the external reference, which varies from 0-10 Volt.
Parameter 214 Reference function is programmed
to Sum [0] and Relati v e [1] respecti v ely. Also
shown is a graph in which parameter 215 Preset
reference 1 is programmed to 0 %.
®
VLT FCD Series
10 Hz
50 Hz
15 %
Reference
0 V
10 V
10.0 Hz
16.0 Hz
6.0 Hz
32.0 Hz
10.0 Hz
16.0 Hz
2.4 Hz
28.4 Hz
53