Danfoss VLT AutomationDrive FC 300 Series Programming Manual page 61

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 3600.00
*
s]
3-42 Ramp 1 Ramp Down Time
Range:
Size [ 0.01 -
related 3600.00
*
s]
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Range:
50 % [ 1 - 99.
*
%]
60
®
VLT
Function:
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
S
ramp-up time such that 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
MG33ME02 - VLT
AutomationDrive Programmming 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*.
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