Danfoss VLT 2800 Design Manual page 81

Programming
maximum reference cannot exceed the value in parameter
415 Maximum feedback.
Maximum reference is ignored if the local reference is
active.
The reference unit can be defined from the following table:
Parameter 100 Configuration
[0] Open loop
[1] Speed reg, closed loop
[3] Process reg, closed loop
Description of choice:
Maximum reference is set, if the speed of the motor is to
be max. the set value, regardless of the whether the
resulting reference is greater than the maximum reference.
206 Ramp type
Value:
Linear (Linear)
Sin shaped (SIN SHAPED)
2
Sin shaped (S-SHAPED 2)
Function:
Select between a linear, an S-shaped and an S
process.
Description of choice:
Select the required ramp type depending on the required
acceleration/deceleration process.
Illustration 4.8 Ramp Type and Acceleration Process
MG27E402
Design Guide
207
Value:
0.02 - 3600.00 s
Function:
The ramp-up time is the acceleration time from 0 Hz to
Unit
the rated motor frequency f
Hz
frequency, f
RPM
not reach the current limit (set in parameter 221 Current
Parameter 416
limit I
LIM
[0]
[1]
[2]
2
ramp
Illustration 4.9 Ramp Up and Ramp Down
Description of choice:
Set the required ramp-up time.
208
Value:
0.02-3600.00 s
Function:
The ramp-down time is the deceleration time from the
rated motor frequency f
f ) to 0 Hz, provided no overvoltage arises in the inverter
M,N
because of generating operation of the motor.
Description of choice:
Set the required ramp-down time.
Danfoss A/S © Rev. May/2014 All rights reserved.
Ramp-up time 1
10.00 s (VLT 2880-2882)
(parameter 104 Motor
M,N
). It is assumed that the output current does
M,N
).
Ramp-down time 1
10.00 s (VLT 2880-2882)
(parameter 104 Motor frequency,
M,N
3.00 s (VLT 2803-2875)
4
3.00 s (VLT 2803-2875)
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