Danfoss VLT AutomationDrive FC 301, Programming Manual, Page: 112 / 722

Application Settings
I
Load
/I
Motor
> 50
High load at low speed <30% (rated
speed) Increase parameter 1-17 Voltage filter time const . Increase parameter 1-66 Min. Current
at Low Speed (>100% for longer time can overheat the motor).
If the motor starts oscillating at a certain speed, increase parameter 1-14 Damping Gain . Increase the value in small steps. Depending
on the motor, a good value for this parameter can be 10% or 100% higher than the default value.
Adjust starting torque in
parameter 1-66 Min. Current at Low Speed . 100% provides nominal torque as starting torque.
Table 149: Recommendations for Flux Applications
Application Settings
Low inertia applications Keep calculated values.
High inertia applications Parameter 1-66 Min. Current at Low Speed. Increase speed to a value between default and maximum
depending on application. Set ramp times matching the application. Too fast ramp-up causes an
overcurrent/overtorque. Too fast ramp-down causes an overvoltage trip.
High load at low speed
Parameter 1-66 Min. Current at Low Speed. Increase speed to a value between default and maximum
depending on application.
Adjust starting torque in parameter 1-66 Min. Current at Low Speed . 100% provides nominal torque as starting torque.
5.3 Parameter Group 2-** Brakes
5.3.1 2-0* DC Brakes
Parameter group for configuring the DC brake and DC hold functions.
Parameter 2-00 DC Hold Current
Table 150: Parameter 2-00 DC Hold Current
2-00 DC Hold Current
Default value: 50% Parameter type: Range, 0 - 160% Setup: All setups
Conversion index: 0 Data type: Uint8 Change during operation: True
N O T I C E
The maximum value depends on the rated motor current. Avoid 100% current for too long. It may damage the motor. In VVC+
control core, low values (<20%) of DC hold may result in wrong currents with larger motor sizes (>90 kW) and should be avoided.
In cases when low DC hold currents with larger motors are required, select Flux control core to ensure the right currents.
Enter a value for holding current as a percentage of the rated motor current I
M,N
set in parameter 1-24 Motor Current . 100% DC hold
current corresponds to I
M,N
. This parameter holds the motor function (holding torque) or preheats the motor. This parameter is ac-
tive if DC hold is selected in parameter 1-72 Start Function [0] or parameter 1-80 Function at Stop [1] .
Parameter 2-01 DC Brake Current
Table 151: Parameter 2-01 DC Brake Current
2-01 DC Brake Current
Default value: 50% Parameter type: Range, 0 - 1000% Setup: All setups
Conversion index: 0 Data type: Uint16 Change during operation: True
N O T I C E
The maximum value depends on the rated motor current. Avoid 100% current for too long. It may damage the motor.
AU275636650261en-000101 / 130R0334 112 | Danfoss A/S © 2022.12
Parameter Descriptions
VLT AutomationDrive FC 301/302
Programming Guide