Danfoss VLT AutomationDrive EZ FC 321 Programming Manual page 82

VLT® AutomationDrive EZ FC 321
Programming Guide
If parameter 40-50 Flux Sensorless Model Shift is set to [0] Off, this parameter is ignored.
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.
Parameter 1-67 Load Type
Table 119: Parameter 1-67 Load Type
1-67 Load Type
Default value: Size related
Conversion index: –
Option Name Description
[0] Passive load For conveyors, fans, and pump applications.
[1] Active load For hoisting applications. This option allows the drive to ramp up at 0 RPM. When [1] Active Load is selec-
ted, set parameter 1-66 Min. Current at Low Speed to a level which corresponds to maximum torque.
Parameter 1-68 Motor Inertia
Table 120: Parameter 1-68 Motor Inertia
1-68 Motor Inertia
²
Default value: 0 kgm
Conversion index: -4
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.
Parameter 1-69 System Inertia
Table 121: Parameter 1-69 System Inertia
1-69 System Inertia
Default value: Size related
Conversion index: -4
This parameter cannot be adjusted while the motor is running.
The system inertia and parameter 7-08 Speed PID Feed Forward Factor is used to calculate acceleration feed forward for the speed PID
controller. Automatic measurement of system inertia and setting of this parameter is activated by setting the parameter to 0. Sys-
tem inertia is calculated after the 1
tion is only active when parameter 1-01 Motor Control Principle is set to [2] Flux Sensorless or [3] Flux w/motor feedb. Accelerate to at
least model shift frequency (parameter 1-53 Model Shift Frequency) + 10 Hz and decelerate to produce a result. Measurement is possi-
ble in both speed, position, or synchronization mode.
82 | Danfoss A/S © 2021.08
N O T I C E
Parameter type: Option
Data type: Uint32
Parameter type: Range, 0.0000 - 10000.0000 kgm
Data type: Uint32
Parameter type: Range, 0000 - 10000.0000 kgm
Data type: Uint32
N O T I C E
st
running cycle with sufficient data and the parameter is automatically set after stop. The func-
Parameter Descriptions
Setup: All setups
Change during operation: True
2
Setup: All setups
Change during operation: False
2
Setup: All setups
Change during operation: False
AU373327181955en-000101 / 130R1208