Danfoss FC 300 Programming Manual page 59

Parameter Descriptions
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.
3-71 Ramp 4 Ramp up Time
Range: Function:
Applica- Enter the ramp-up time, i.e. the acceleration
tion [Applica- time from 0 RPM to the rated motor speed n
depend- tion
Choose a ramp-up time such that the output
ent depend- current does not exceed the current limit in
*
ant] par. 4-18 Current Limit during ramping. The
value 0.00 corresponds to 0.01 sec. in speed
mode. See ramp-down time in
par. 3-72 Ramp 4 Ramp Down Time.
Par . 3 − 71 =
3-72 Ramp 4 Ramp Down Time
Range: Function:
Applica- Enter the ramp-down time, i.e. the decelera-
tion [Applica- tion time from the rated motor speed n
depend- tion RPM. Choose a ramp-down time such that no
ent depend-
* over-voltage arises in the inverter due to
ant]
regenerative operation of the motor, and
such that the generated current does not
exceed the current limit set in
par. 4-18 Current Limit. The value 0.00
corresponds to 0.01 s in speed mode. See
ramp-up time in par. 3-71 Ramp 4 Ramp up
Time.
Par . 3 − 72 =
3-75 Ramp 4 S-ramp Ratio at Accel. Start
Range: Function:
50 % [Application Enter the proportion of the total ramp-up
*
dependant] time (par. 3-71 Ramp 4 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.
FC 300 Programming Guide
50 %
.
s
50 %
t acc s x n s RPM
ref RPM
50 %
to 0
s
3.5.7 3-8* Other Ramps
t dec s x n s RPM
ref RPM
Applica-
tion
depend-
ent
®
MG.33.M9.02 - VLT is a registered Danfoss trademark
3-76 Ramp 4 S-ramp Ratio at Accel. End
Range: Function:
[Application Enter the proportion of the total ramp-up
*
dependant] time (par. 3-71 Ramp 4 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.
3-77 Ramp 4 S-ramp Ratio at Decel. Start
Range: Function:
[Application Enter the proportion of the total ramp-
*
dependant] down time (par. 3-72 Ramp 4 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.
3-78 Ramp 4 S-ramp Ratio at Decel. End
Range: Function:
[Application Enter the proportion of the total ramp-
*
dependant] down time (par. 3-72 Ramp 4 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.
3-80 Jog Ramp Time
Range: Function:
[0.01 - Enter the jog ramp time, i.e. the accelera-
3600.00 s] tion/deceleration time between 0 RPM
and the rated motor frequency n
that the resultant output current required
*
for the given jog ramp time does not
exceed the current limit in
par. 4-18 Current Limit. The jog ramp time
starts upon activation of a jog signal via
the LCP, a selected digital input, or the
serial communication port. When jog state
is disabled then the normal ramping times
are valid.
3 3
. Ensure
s
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