Danfoss VLT AutomationDrive FC 300 Programming Manual page 60

Parameter Descriptions
3-50 Ramp 2 Type
Option: Function:
[1] S-ramp Acceleration with lowest possible jerk
Const Jerk
[2] S-ramp S-ramp based on the values set in 3-51 Ramp 2
Const Time Ramp up Time and 3-52 Ramp 2 Ramp down
Time
NOTE
If S-ramp [1] 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.
3-51 Ramp 2 Ramp up Time
Range: Function:
Application [Application Enter the ramp-up time, i.e. the
dependent dependant] acceleration time from 0 RPM to the
*
rated motor speed n
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 sec. in
speed mode. See ramp-down time in
3-52 Ramp 2 Ramp down Time.
Par . 3 − 51 =
3-52 Ramp 2 Ramp down Time
Range: Function:
Application Enter the ramp-down time, i.e. the
dependent [Application deceleration time from the rated
*
dependant] motor speed n
ramp-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 sec. in speed
mode. See ramp-up time in 3-51 Ramp
2 Ramp up Time.
Par . 3 − 52 =
3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range: Function:
50 % [Application Enter the proportion of the total ramp-
*
dependant] up time (3-51 Ramp 2 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.
FC 300 Programming Guide
3-56 Ramp 2 S-ramp Ratio at Accel. End
Range:
50 %
3-57 Ramp 2 S-ramp Ratio at Decel. Start
Range:
50 %
3-58 Ramp 2 S-ramp Ratio at Decel. End
. Choose a ramp-
s
Range:
50 %
t acc s x n s RPM
ref RPM
3.5.5 3-6* Ramp 3
Configure ramp parameters, see 3-4*.
3-60 Ramp 3 Type
to 0 RPM. Choose a
s
Option:
[0]
[1]
t dec s x n s RPM
ref RPM
[2]
®
MG.33.MB.02 - VLT is a registered Danfoss trademark
Function:
[Application Enter the proportion of the total ramp-
*
dependant] up time (3-51 Ramp 2 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:
[Application Enter the proportion of the total ramp-
*
dependant] down time (3-52 Ramp 2 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:
[Application Enter the proportion of the total ramp-
*
dependant] down time (3-52 Ramp 2 Ramp down
Time) where the deceleration 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:
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.
Linear
*
S-ramp Accelerates with lowest possible jerk.
Const Jerk
S-ramp S-ramp based on the values set in 3-61 Ramp 3
Const Time Ramp up Time and 3-62 Ramp 3 Ramp down
Time
3 3
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