10.00 sec (VLT 2880-2882)
Function:
The jog ramp time is the acceleration/deceleration
time from 0 Hz to the rated motor frequency f
M,N
(pa-
rameter 104
Motor frequency, f
M,N
). It is assumed that
the output current will not reach the current limit (set in
parameter 221
Current limit I
LIM
).
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.
3.00 sec (VLT 2803-2875)
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
LIM
. Quick-stop is activated via one of 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
MAX
10.0 Hz
Function:
Jog frequency f
JOG
means a fixed output frequency
that the variable frequency drive 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)
[0]
Relative (relative)
[1]
External/preset (external/preset)
[2]
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 analog references,
pulse references and any references from serial com-
munication.
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
MIN
- Ref
MAX
), added to the other external referen-
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
VLT
®
2800 Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.27.A2.22 - VLT
®
is a registered Danfoss trademark
55
Prog
rammi
ng
