Danfoss VLT Series Programming Manual page 56

Parameter Description
tacc × nnorm par .1 − 25
par .3 − 41 =
ref rpm
3-42 Ramp 1 Ramp Down Time
Range: Function:
Size [ 1.00 - Enter the ramp-down time, i.e. the
related 3600.00 s] 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.
tdec × nnorm par .1 − 25
par .3 − 42 =
ref rpm
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Range: Function:
50 % [1 - 99. %] 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
compensation 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 % [1 - 99. %] 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
compensation achieved, and thus the lower
the torque jerks in the application.
3-47 Ramp 1 S-ramp Ratio at Decel. Start
Range: Function:
50 % [1 - 99. %] 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.
®
VLT HVAC Drive Programming Guide
s
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MG.11.CC.02 - VLT is a registered Danfoss trademark
3-48 Ramp 1 S-ramp Ratio at Decel. End
Range: Function:
50 % [1 - 99. %] 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 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 [ 1.00 - Enter the ramp-up time, i.e. the acceleration
related 3600.00 time from 0 RPM to 1-25 Motor Nominal
*
s] 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 =
3-52 Ramp 2 Ramp Down Time
Range: Function:
Size [ 1.00 - Enter the ramp-down time, i.e. the
related 3600.00 deceleration time from 1-25 Motor Nominal
*
s] 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 =
3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range: Function:
50 % [1 - 99. %] 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
compensation achieved, and thus the lower
the torque jerks in the application.
3-56 Ramp 2 S-ramp Ratio at Accel. End
Range: Function:
50 % [1 - 99. %] 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
compensation achieved, and thus the lower
the torque jerks in the application.
tacc × nnorm par . 1 − 25
s
ref rpm
tdec × nnorm par . 1 − 25
s
ref rpm
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