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 Unit
[0] Open loop Hz
[1] Speed reg, closed loop RPM
[3] Process reg, closed loop Parameter 416
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) [0]
Sin shaped (SIN SHAPED) [1]
Sin
2
shaped (S-SHAPED 2) [2]
Function:
Select between a linear, an S-shaped and an S
2
ramp
process.
Description of choice:
Select the required ramp type depending on the required
acceleration/deceleration process.
Illustration 4.8 Ramp Type and Acceleration Process
207 Ramp-up time 1
Value:
0.02 - 3600.00 s
3.00 s (VLT 2803-2875)
10.00 s (VLT 2880-2882)
Function:
The ramp-up time is the acceleration time from 0 Hz to
the rated motor frequency f
M,N
(parameter 104 Motor
frequency, f
M,N
). It is assumed that the output current does
not reach the current limit (set in parameter 221 Current
limit I
LIM
).
Illustration 4.9 Ramp Up and Ramp Down
Description of choice:
Set the required ramp-up time.
208
Ramp-down time 1
Value:
0.02-3600.00 s
3.00 s (VLT 2803-2875)
10.00 s (VLT 2880-2882)
Function:
The ramp-down time is the deceleration time from the
rated motor frequency f
M,N
(parameter 104 Motor frequency,
f
M,N
) to 0 Hz, provided no overvoltage arises in the inverter
because of generating operation of the motor.
Description of choice:
Set the required ramp-down time.
Programming Design Guide
MG27E402 Danfoss A/S © Rev. May/2014 All rights reserved. 79
4 4
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