Ramp 1 S-Ramp Ratio At Accel. Start; Ramp 1 S-Ramp Ratio At Accel. End; Ramp 1 S-Ramp Ratio At Decel. Start; Ramp 1 S-Ramp Ratio At Decel. End - Danfoss VLT Programming Manual

3 Parameter Description

3-45 Ramp 1 S-ramp Ratio at Accel. Start

Range:
50 %* [Application dependant]

3-46 Ramp 1 S-ramp Ratio at Accel. End

3
Range:
50 %* [Application dependant]

3-47 Ramp 1 S-ramp Ratio at Decel. Start

Range:
50 %* [Application dependant]

3-48 Ramp 1 S-ramp Ratio at Decel. End

Range:
50 %* [Application dependant]
3.5.4 3-5* Ramp 2
Choosing ramp parameters, see 3-4*.
3-51 Ramp 2 Ramp Up Time
Range:
Application [Application dependant]
dependent*
3-52 Ramp 2 Ramp Down Time
Range:
Application [Application dependant]
dependent*
3-55 Ramp 2 S-ramp Ratio at Accel. Start
Range:
50 %* [Application dependant]
68
Function:
Enter the proportion of the total ramp-up time (par. 3-41
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.
Function:
Enter the proportion of the total ramp-up time (par. 3-41
acceleration torque decreases. The larger the percentage value, the greater the jerk compensation
achieved, and thus the lower the torque jerks in the application.
Function:
Enter the proportion of the total ramp-down time (par. 3-42
deceleration torque increases. The larger the percentage value, the greater the jerk compensation
achieved, and thus the lower the torque jerks in the application.
Function:
Enter the proportion of the total ramp-down time (par. 3-42
deceleration torque decreases. The larger the percentage value, the greater the jerk compensation
achieved, and thus the lower the torque jerks in the application.
Function:
Enter the ramp-up time, i.e. the acceleration time from 0 RPM to par. 1-25
Choose a ramp-up time such that the output current does not exceed the current limit in
par. 4-18 Current Limit during ramping. See ramp-down time in par. 3-52
Time
.
tacc × nnorm par
par . 3 − 51 =
ref rpm
Function:
Enter the ramp-down time, i.e. the deceleration time from par. 1-25
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
Current Limit
in par. 4-18 . See ramp-up time in par. 3-51
tdec × nnorm par
par .3 − 52 =
ref rpm
Function:
Enter the proportion of the total ramp-up time (par. 3-51
acceleration torque increases. The larger the percentage value, the greater the jerk compensation
achieved, and thus the lower the torque jerks in the application.
MG.11.C9.02 - VLT ® is a registered Danfoss trademark
®
VLT HVAC Drive Programming Guide
Ramp 1 Ramp up Time
Ramp 1 Ramp up Time
Ramp 1 Ramp Down Time
Ramp 1 Ramp Down Time
. 1 − 25
s
Motor Nominal Speed
Ramp 2 Ramp Up Time
. 1 − 25
s
Ramp 2 Ramp up Time
) in which the
) in which the
) where the
) where the
Motor Nominal Speed
.
Ramp 2 Ramp Down
to 0 RPM.
.
) in which the