Danfoss VLT AutomationDrive FC 301 Programming Manual page 114

Programming Guide | VLT® AutomationDrive FC 301/FC 302
Enter the minimum motor current at low speed, see parameter 1-53 Model Shift Frequency. Increasing this current improves motor
torque at low speed. Parameter 1-66 Min. Current at Low Speed is enabled when parameter 1-00 Configuration Mode is set to [0] Speed
open loop only. The drive runs with constant current through motor for speeds below 10 Hz. For speeds above 10 Hz, the motor flux
model in the drive controls the motor. Parameter 4-16 Torque Limit Motor Mode and/or parameter 4-17 Torque Limit Generator Mode
automatically adjust parameter 1-66 Min. Current at Low Speed. The parameter with the highest value adjusts parameter 1-66 Min.
Current at Low Speed. The current setting in parameter 1-66 Min. Current at Low Speed is composed of the torque generating current
and the magnetizing current. Example: Set parameter 4-16 Torque Limit Motor Mode to 100% and set parameter 4-17 Torque Limit
Generator Mode to 60%. Parameter 1-66 Min. Current at Low Speed automatically adjusts to about 127%, depending on the motor size.
1-67 Load Type
Default setting: [0] Passive load
Setup:
All setups
Data type: Uint8
Option Name
[0]* Passive load
[1] Active load
1-68 Motor Inertia
Default value:
0 kgm
Setup:
All setups
Data type: Uint32
Enter the motor inertia to obtain an improved torque readout and therefore a better estimate of the mechanical torque on the shaft.
Available in flux control principle only.
1-69 System Inertia
Default value: Size related
Setup: All setups
Data type:
Uint32
This parameter cannot be adjusted while the motor is running.
The system inertia and parameter 7-08 Speed PID Feed Forward Factor are used to calculate acceleration feed forward for the speed PID
controller. Automatic measurement of system inertia and setting of this parameter are activated by setting the parameter to 0. System
inertia is calculated after the 1st running cycle with sufficient data and the parameter is automatically set after stop. The function is only
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Parameter type:
Conversion index:
Change during operation:
Description
For conveyors, fans, and pump applications.
For hoisting applications. This option allows the drive to ramp
up at 0 RPM. When [1] Active Load is selected, set parameter
1-66 Min. Current at Low Speed to a level which corresponds to
maximum torque.
Parameter type:
Conversion index:
Change during operation:
Parameter type:
Conversion index:
Change during operation:
NOTICE
Parameter Descriptions
Option
–
True
Range, 0.0000 - 10000.0000
2
kgm
-4
False
Range, 0000 - 10000.0000
2
kgm
-4
False
AU275636650261en-003201 / 130R0334