Parameter 3-42 Ramp 1 Ramp Down Time
Table 185: Parameter 3-42 Ramp 1 Ramp Down Time
3-42 Ramp 1 Ramp Down Time
Default value: Size related
Parameter type: Range, 0.01 - 3600 s
Setup: All setups
Conversion index: -2
Data type: Uint32
Change during operation: True
Enter the ramp-down time, that is the deceleration time from the synchronous motor speed n
s
to 0 RPM. Select a ramp-down time
such that no overvoltage occurs in the inverter due to regenerative operation of the motor, and such that the generated current
does not exceed the current limit set in
parameter 4-18 Current Limit
. The value 0.00 corresponds to 0.01 s in speed mode. See ramp-
up time in
parameter 3-41 Ramp 1 Ramp Up Time
.
Par . 3 − 42 =
t
dec
s
×
n
s
RPM
ref RPM
Parameter 3-45 Ramp 1 S-ramp Ratio at Accel. Start
Table 186: Parameter 3-45 Ramp 1 S-ramp Ratio at Accel. Start
3-45 Ramp 1 S-ramp Ratio at Accel. Start
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-up time (
parameter 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.
Parameter 3-46 Ramp 1 S-ramp Ratio Accel. End
Table 187: Parameter 3-46 Ramp 1 S-ramp Ratio at Accel. End
3-46 Ramp 1 S-ramp Ratio at Accel. End
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-up time (
parameter 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.
Parameter 3-47 Ramp 1 S-ramp Ratio at Decel. Start
Table 188: Parameter 3-47 Ramp 1 S-ramp Ratio at Decel. Start
3-47 Ramp 1 S-ramp Ratio at Decel. Start
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
Enter the proportion of the total ramp-down time (
parameter 3-42 Ramp 1 Ramp Down Time
) where the deceleration torque increa-
ses. The larger the percentage value, the greater the jerk compensation achieved, and thus the lower the torque jerks in the applica-
tion.
Parameter 3-48 Ramp 1 S-ramp Ratio at Decel. End
Table 189: Parameter 3-48 Ramp 1 S-ramp Ratio at Decel. End
3-48 Ramp 1 S-ramp Ratio at Decel. End
Default value: 50%
Parameter type: Range, 1 - 99%
Setup: All setups
Conversion index: 0
Data type: Uint8
Change during operation: True
AU373327181955en-000101 / 130R1208 | 113
Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
