Danfoss VLT 2800 Series Operating Instructions Manual page 32

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
(Q STOP RAMP TIME)
Value:
0.02 - 3600.00 sec.
10.00 sec (VLT 2880-2882)
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 gen-
erating operation of the motor, or if the generated
current exceeds the current limit in parameter 221
Current limit I . Quick-stop is activated via one of the
LIM
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
MAX
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 activa-
ted via the digital inputs, serial communication or via
the LCP control panel, on the condition that this is ac-
tive in parameter 015 Local jog.
Description of choice:
Set the required frequency.
214 Reference function
(Ref function)
Value:
Sum (sum)
Relative (relative)
External/preset (external/preset)
= factory setting, () = display text, [] = value for use in communication via serial communication port
®
MG.27.A2.02 - VLT is a registered Danfoss trademark
3.00 sec (VLT 2803-2875)
10.0 Hz
[0]
[1]
[2]
®
VLT 2800 Series
Function:
It is possible to define how preset references are to be
added to the other references; for this purpose, use
Sum or Relative. It is also possible by using the Exter-
nal/preset to select whether a shift between external
references and preset references is required.
External reference is the sum of the analogue refer-
ences, pulse references and any references from se-
rial communication.
Description of choice:
If Sum [0] is selected, one of the adjusted preset ref-
erences (parameters 215-218 Preset reference) is
summarized as a percentage of the reference range
(Ref - Ref ), added to the other external referen-
MIN MAX
ces.
If Relative [1] is selected, one of the added preset ref-
erences (parameters 215-218 Preset reference) is
summarized as a percentage of the sum of present
external references.
If External/preset [2] is selected, it is possible via a dig-
ital input to shift between external references or preset
references. Preset references will be a percentage
value of the reference range.
NB!
If Sum or Relative is selected, one of the
preset references will always be active. If
the preset references are to be without in-
fluence, they must be set to 0% (factory
setting).
215 Preset reference 1 (PRESET REF. 1)
216 Preset reference 2 (PRESET REF. 2)
217 Preset reference 3 (PRESET REF. 3)
218 Preset reference 4 (PRESET REF. 4)
Value:
-100.00% - +100.00%
of the reference range/external reference
Function:
Four different preset references can be programmed
in parameters 215-218 Preset reference.
The preset reference is stated as a percentage of the
reference range (Ref - Ref
MIN
of the other external references, depending on the
choice made in parameter 214 Reference function.
The choice between preset references can be made
via the digital inputs or via serial communication.
0.00%
) or as a percentage
MAX
31