N O T I C E
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
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint32
Change during operation: True
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
Default value: 0 kgm
²
Parameter type: Range, 0.0000 - 10000.0000 kgm
2
Setup: All setups
Conversion index: -4
Data type: Uint32
Change during operation: False
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
Parameter type: Range, 0000 - 10000.0000 kgm
2
Setup: All setups
Conversion index: -4
Data type: Uint32
Change during operation: False
N O T I C E
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
st
running cycle with sufficient data and the parameter is automatically set after stop. The func-
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.
AU373327181955en-000101 / 130R1208
82 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
Содержание VLT AutomationDrive EZ FC 321
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