Danfoss VLT 2800 Design Manual page 82

Programming
209 Ramp-up time 2
Value:
0.02-3600.00 s
Function:
See description of parameter 207 Ramp-up time 1.
Description of choice:
4 4
Set the required ramp-up time. Shift from ramp 1 to ramp
2 by activating Ramp 2 via a digital input.
210 Ramp-down time 2
Value:
0.02-3600.00 s
Function:
See description of parameter 208 Ramp-down time 1.
Description of choice:
Set the required ramp-down time. Shift from ramp 1 to
ramp 2 by activating Ramp 2 via a digital input.
211 Job ramp time
Value:
0.02-3600.00 s
Function:
The jog ramp time is the acceleration/deceleration time
from 0 Hz to the rated motor frequency f
104 Motor frequency, f
current does not reach the current limit (set in parameter
221 Current limit I
Illustration 4.10 Jog Ramp
The jog ramp time starts if a jog-signal is given via the
LCP, one of the digital inputs or the serial communication
port.
Description of choice:
Set the required ramp time.
80
Design Guide
3.00 s (VLT 2803-2875)
10.00 s (VLT 2880-2882)
3.00 s (VLT 2803-2875)
10.00 s (VLT 2880-2882)
3.00 s (VLT 2803-2875)
10.00 s (VLT 2880-2882)
(parameter
M,N
). It is assumed that the output
M,N
).
LIM
Danfoss A/S © Rev. May/2014 All rights reserved.
212 Quick-stop ramp-down time
Value:
0.02-3600.00 s
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 activated via one of the digital inputs or the
serial communication.
Description of choice:
Set the required ramp-down time.
213 Jog frequency
Value:
0.0 - Parameter 202 Output frequency high
limit, f
MAX
Function:
Jog frequency f means a fixed output frequency that
JOG
the frequency converter supplies to the motor when the
jog function is activated. Jog can be activated via the
digital inputs, serial communication or via the LCP, on the
condition that this is active in parameter 015 Local jog.
Description of choice:
Set the required frequency.
The example shows how the resulting reference is
calculated when Preset references is used with Sum and
Relative in parameter 214 Reference function. The formula
for the calculation of the resulting reference is described in
chapter 5 All about VLT 2800. Also see Illustration 4.7 for
more details.
The following parameters are preset:
Parameter 204 Minimum reference
Parameter205 Maximum reference
Parameter215 Preset reference
Parameter308 Term. 53, Analogue input
Parameter309 Term. 53, min. scaling
Parameter310 Term. 53, max. scaling
When parameter 214 Reference function is set to [0] Sum,
one of the preset Preset references (parameter 215-218) is
added to the external references as a percentage of the
reference range. If terminal 53 is applied to an analog
input voltage of 4 V, the resulting reference is:
Parameter 214 Reference function = Sum [0]:
Parameter 204 Minimum reference
Reference contribution at 4 V
Parameter 215 Preset reference
Resulting reference
3.00 s (VLT 2803-2875)
10.00 s (VLT 2880-2882)
.
LIM
10.0 Hz
10 Hz
50 Hz
15 %
Reference
0 V
10 V
10.0 Hz
16.0 Hz
6.0 Hz
32.0 Hz
MG27E402