Reference Function - Danfoss VLT FCD 311 Design Manual

The jog ramp time starts if a jog-signal is given via
the LCP control panel, one of the digital inputs or the
serial communication port.
Description of choice:
Set the required ramp time.
212 Quick-stop ramp-down time
212
(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, pro-
vided no overvoltage arises in the inverter because
of generating operation of the motor, or if the gener-
ated current exceeds the current limit in parameter
221 Current limit I . Quick-stop is activated via one
LIM
of the digital inputs or the serial communication.
Description of choice:
Set the required ramp-down time.
213 Jog frequency
213
(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 activated. Jog can be acti-
vated via the digital inputs, serial communication or
via the LCP control panel, on the condition that this
is active 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 Relative in parameter 214 Reference
function. The formula for the calculation of the re-
sulting 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.A1.02 - VLT is a registered Danfoss trade mark
®
VLT FCD Series
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
When parameter 214 Reference function is set to
Sum [0] one of the preset Preset references(par.
3.00 sec
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
Relative [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:
MAX
Par. 214 Reference function = Relative [1]:
10.0 Hz
Par. 204 Minimum reference
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 pro-
grammed to Sum [0] and Relative [1] respectively .
Also shown is a graph in which parameter 215 Pre-
set reference 1 is programmed to 0 %.
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
69