Technical information

3-42 Ramp 1 Ramp Down Time
Range: Function:
Size
related*
[ 1.00 -
3600.00 s]
Enter the ramp-down time, i.e. the
deceleration time from 1-25 Motor
Nominal Speed to 0 RPM. Choose a
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. See ramp-up time in
3-41 Ramp 1 Ramp Up Time.
par .3 − 42 =
tdec × nnorm par .1 − 25
ref rpm
s
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
compensation achieved, and thus the
lower the torque jerks in the
application.
3-48 Ramp 1 S-ramp Ratio at Decel. End
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 decreases. The larger the
percentage value, the greater the jerk
compensation achieved, and thus the
3-48 Ramp 1 S-ramp Ratio at Decel. End
Range: Function:
lower the torque jerks in the
application.
3.5.4 3-5* Ramp 2
Choosing ramp parameters, see parameter group 3-4*.
3-51 Ramp 2 Ramp Up Time
Range: Function:
Size
related*
[ 1.00 -
3600.00
s]
Enter the ramp-up time, i.e. the acceleration
time from 0 RPM to 1-25 Motor Nominal
Speed. Choose a ramp-up time such that the
output current does not exceed the current
limit in 4-18 Current Limit during ramping.
See ramp-down time in 3-52 Ramp 2 Ramp
Down Time.
par . 3 − 51 =
tacc × nnorm par . 1 − 25
ref rpm
s
3-52 Ramp 2 Ramp Down Time
Range: Function:
Size
related*
[ 1.00 -
3600.00
s]
Enter the ramp-down time, i.e. the
deceleration time from 1-25 Motor Nominal
Speed to 0 RPM. Choose a 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. See ramp-up time in
3-51 Ramp 2 Ramp Up Time.
par .3 − 52 =
tdec × nnorm par . 1 − 25
ref rpm
s
3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range: Function:
50 %* [Application
dependant]
Enter the proportion of the total
ramp-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.
3-56 Ramp 2 S-ramp Ratio at Accel. End
Range: Function:
50 %* [Application
dependant]
Enter the proportion of the total
ramp-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.
Parameter Description
VLT
®
HVAC Drive Programming Guide
MG11CD02 - VLT
®
is a registered Danfoss trademark 55
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