Danfoss VLT AutomationDrive FC 300 Programming Manual page 68

Parameter Descriptions
3-40 Ramp 1 Type
Option:
3 3
[0] Linear
[1] S-ramp
Const Jerk
[2] S-ramp
Const Time
NOTE
If [1] S-ramp Const Jerk is selected and the reference during
ramping is changed the ramp time may be prolonged in
order to realize a jerk free movement which may result in
a longer start or stop time.
Additional adjustment of the S-ramp ratios or switching
initiators may be necessary.
3-41 Ramp 1 Ramp Up Time
Range:
Size [ 0.01
related - 3600
*
s]
3-42 Ramp 1 Ramp Down Time
Range:
Size [ 0.01
related - 3600
*
s]
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Range:
50 % [ 1 - 99
*
%]
66
VLT
Function:
Select the ramp type, depending on
requirements for acceleration/deceleration.
A linear ramp will give constant acceleration
during ramping. An S-ramp will give non-linear
acceleration, compensating for jerk in the
application.
Acceleration with lowest possible jerk.
S-ramp based on the values set in 3-41 Ramp 1
Ramp Up Time and 3-42 Ramp 1 Ramp Down
Time.
Function:
Enter the ramp-up time, i.e. the acceleration
time from 0 RPM to the synchronous motor
speed n . Choose a ramp-up time such that
S
the output current does not exceed the
current limit in 4-18 Current Limit during
ramping. The value 0.00 corresponds to 0.01
s in speed mode. See ramp-down time in
3-42 Ramp 1 Ramp Down Time.
t acc s x n s RPM
Par . 3 − 41 =
ref RPM
Function:
Enter the ramp-down time, that is, the
deceleration time from the synchronous
motor speed n to 0 RPM. Choose a ramp-
s
down time such that no over-voltage arises in
the inverter due to regenerative operation of
the motor, and such that the generated
current does not exceed the current limit set
in 4-18 Current Limit. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-up time in 3-41 Ramp 1 Ramp Up Time.
t dec s x n s RPM
Par . 3 − 42 =
ref RPM
Function:
Enter the proportion of the total ramp-up
time (3-41 Ramp 1 Ramp Up Time) in which
MG33MG02 - VLT
®
AutomationDrive Programming Guide
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Range:
3-46 Ramp 1 S-ramp Ratio at Accel. End
Range:
50 % [ 1 - 99
*
%]
3-47 Ramp 1 S-ramp Ratio at Decel. Start
Range:
50 % [ 1 - 99
*
%]
3-48 Ramp 1 S-ramp Ratio at Decel. End
Range:
50 % [ 1 - 99
*
%]
3.5.4 3-5* Ramp 2
Choosing ramp parameters, see parameter group 3-4*
Ramp 1.
3-50 Ramp 2 Type
Option:
[0] Linear
[1] S-ramp
Const Jerk
[2] S-ramp
Const Time
®
is a registered Danfoss trademark
Function:
the acceleration torque increases. The larger
the percentage value, the greater the jerk
compensation achieved, and thus the lower
the torque jerks occurring in the application.
Function:
Enter the proportion of the total ramp-up
time (3-41 Ramp 1 Ramp Up Time) in which
the acceleration torque decreases. The larger
the percentage value, the greater the jerk
compensation achieved, and thus the lower
the torque jerks in the application.
Function:
Enter the proportion of the total ramp-down
time (3-42 Ramp 1 Ramp Down Time) where
the deceleration torque increases. The larger
the percentage value, the greater the jerk
compensation achieved, and thus the lower
the torque jerks in the application.
Function:
Enter the proportion of the total ramp-down
time (3-42 Ramp 1 Ramp Down Time) where
the deceleration torque decreases. The larger
the percentage value, the greater the jerk
compensation achieved, and thus the lower
the torque jerks in the application.
Function:
Select the ramp type, depending on
requirements for acceleration/deceleration. A
linear ramp will give constant acceleration
during ramping. An S-ramp will give non-linear
acceleration, compensating for jerk in the
application.
Acceleration with lowest possible jerk
S-ramp based on the values set in 3-51 Ramp 2
Ramp Up Time and 3-52 Ramp 2 Ramp Down
Time