Danfoss VLT AutomationDrive FC 301 Programming Manual page 68

Parameter Descriptions
3-61 Ramp 3 Ramp up Time
Range:
3 3
3-62 Ramp 3 Ramp down Time
Range:
Size
related [ 0.01
*
- 3600
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 %]
66
VLT
Function:
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. Select a ramp-down time such
s
that no overvoltage 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 compen-
sation 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 compen-
sation 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 compen-
sation 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, and thus the lower the
torque jerks in the application.
®
AutomationDrive FC 301/302 Programming Guide
3.5.6 3-7* Ramp 4
Configure ramp parameters, see parameter group 3-4*
Ramp 1.
3-70 Ramp 4 Type
Option:
[0] Linear
*
[1] S-ramp
Const Jerk
[2] S-ramp
Const Time
NOTICE
If [1] S-ramp Const Jerk is selected and the reference
during ramping is changed, the ramp time may be
prolonged to realise 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
related [ 0.01
*
- 3600
s]
3-72 Ramp 4 Ramp Down Time
Range:
Size
related [ 0.01
*
- 3600
s]
MG33MH02 - Rev. 2013-09-30
Function:
Select the ramp type, depending on
requirements for acceleration and deceleration.
A linear ramp gives constant acceleration
during ramping. An S-ramp gives 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
Select a 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 3-72 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. Select a ramp-down time such
s
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 3-71 Ramp
4 Ramp up Time.
t dec s x n s RPM
Par . 3 − 72 =
ref RPM
.
s