Danfoss VLT AutomationDrive FC 300 Series Programming Manual page 63

Parameter Descriptions
3-61 Ramp 3 Ramp up Time
Range:
3 3
3-62 Ramp 3 Ramp down Time
Range:
Size [ 0.01 -
related 3600.00
*
s]
3-65 Ramp 3 S-ramp Ratio at Accel. Start
Range:
50 % [ 1 - 99.
*
%]
3-66 Ramp 3 S-ramp Ratio at Accel. End
Range:
50 % [ 1 - 99.
*
%]
3-67 Ramp 3 S-ramp Ratio at Decel. Start
Range:
50 % [ 1 - 99.
*
%]
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range:
50 % [ 1 - 99.
*
%]
62
®
VLT
Function:
speed mode. See ramp-down time in
3-62 Ramp 3 Ramp down Time.
Function:
Enter the ramp-down time, i.e. the
deceleration time from the rated motor
speed n to 0 RPM. Choose a ramp-down
s
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 3-61 Ramp 3 Ramp up
Time.
t dec s x n s RPM
Par . 3 − 62 =
ref RPM
Function:
Enter the proportion of the total ramp-up
time (3-61 Ramp 3 Ramp up Time) in which
the acceleration 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-up
time (3-61 Ramp 3 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 (3-62 Ramp 3 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-
downdecel time (3-62 Ramp 3 Ramp down
Time) where the deceleration torque
decreases. The larger the percentage value,
the greater the jerk compensation achieved,
MG33ME02 - VLT
AutomationDrive Programmming Guide
3-68 Ramp 3 S-ramp Ratio at Decel. End
Range:
3.5.6 3-7* Ramp 4
Configure ramp parameters, see 3-4*.
3-70 Ramp 4 Type
Option:
[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.
3-71 Ramp 4 Ramp up Time
Range:
Size [ 0.01 -
related 3600.00
*
s]
3-72 Ramp 4 Ramp Down Time
Range:
Size [ 0.01 -
related 3600.00
*
s]
®
is a registered Danfoss trademark
Function:
and thus the lower the torque jerks in the
application.
Function:
Select the ramp type, depending on
requirements for acceleration and
deceleration. A linear ramp will give constant
acceleration during ramping. An S-ramp will
give non-linear acceleration, compensating
for jerk in the application
Accelerates with lowest possible jerk.
S-ramp based on the values set in 3-71 Ramp
4 Ramp up Time and 3-72 Ramp 4 Ramp Down
Time.
Function:
Enter the ramp-up time, i.e. the
acceleration time from 0 RPM to the rated
motor speed n . Choose a ramp-up time
s
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 3-72 Ramp 4 Ramp
Down Time.
t acc s x n s RPM
Par . 3 − 71 =
ref RPM
Function:
Enter the ramp-down time, i.e. the
deceleration time from the rated motor
speed n to 0 RPM. Choose a ramp-down
s
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