Danfoss FC 300 Series, Руководство по программированию

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3-40 Ramp 1 Type
Option: 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.
[0]
*
Linear
[1] S-ramp
Const Jerk
Acceleration with lowest possible jerk.
[2] S-ramp
Const Time
S-ramp based on the values set in 3-41 Ramp 1
Ramp-up Time and 3-42 Ramp 1 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.
3-41 Ramp 1 Ramp-up Time
Range: Function:
Application
dependent
*
[Application
dependant]
Enter the ramp-up time, i.e., the
acceleration time from 0 RPM to the
synchronous motor speed n
S
. Choose
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 sec. in speed mode. See ramp-
down time in 3-42 Ramp 1 Ramp-down
Time .
Par. 3
− 41 =
tacc s x ns RPM
ref RPM
3-42 Ramp 1 Ramp-down Time
Range: Function:
Application
dependent
*
[Application
dependant]
Enter the ramp-down time, i.e., the
deceleration time from the
synchronous motor speed n
s
to 0 RPM.
Choose a ramp-down time such 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
3-41 Ramp 1 Ramp-up Time .
Par. 3 − 42 =
tdec s x ns RPM
ref RPM
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Range: Function:
50 %
*
[Application
dependant]
Enter the proportion of the total ramp-
up time ( 3-41 Ramp 1 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 occurring in the
application.
3-46 Ramp 1 S-ramp Ratio at Accel. End
Range: Function:
50 %
*
[Application
dependant]
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 compen-
sation achieved, and thus the lower the
torque jerks in the application.
3-47 Ramp 1 S-ramp Ratio at Decel. Start
Range: Function:
50 %
*
[Application
dependant]
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 compen-
sation achieved, and thus the lower the
torque jerks in the application.
Parameter Descriptions FC 300 Programming Guide
3-36 MG.33.MA.22 - VLT
®
is a registered Danfoss trademark
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