Enter the frequency points to form a U/f characteristic manually matching the motor. The voltage at each point is defined in
param-
eter 1-55 U/f Characteristic - U
. This parameter is an array parameter [0–5] and is only accessible when
parameter 1-01 Motor Control
Principle
is set to
[0] U/f
.
Motor Voltage
Par 1-55 [x]
Output Frequency
Par 1-56 [x]
1-55[5]
1-55[4]
1-55[3]
1-55[2]
1-55[1]
1-55[0]
1-56
[0]
1-56
[1]
1-56
[2]
1-56
[3]
1-56
[4]
1-56
[5]
e
3
0
b
a
1
6
6
.1
1
Illustration 32: U/f Characteristic
Parameter 1-58 Flying Start Test Pulses Current
Table 110: Parameter 1-58 Flying Start Test Pulses Current
1-58 Flying Start Test Pulses Current
Default value: Size related
Parameter type: Range, 0 - 200%
Setup: All setups
Conversion index: 0
Data type: Uint16
Change during operation: False
N O T I C E
This parameter is only available in VVC
+
.
N O T I C E
This parameter has effect on PM motors only.
Sets the current level for the flying start test pulses that are used to detect the motor direction. 100% means I
m,n
. Adjust the value to
be high enough to avoid noise influence, but low enough to avoid affecting the accuracy (current must be able to drop to 0 before
the next pulse). Reduce the value to reduce the generated torque. Default is 30% for asynchronous motors, but may vary for PM
motors. For adjusting PM motors, the value tunes for back EMF and d-axis inductance of the motor.
Parameter 1-59 Flying Start Test Pulses Frequency
Table 111: Parameter 1-59 Flying Start Test Pulses Frequency
1-59 Flying Start Test Pulses Frequency
Default value: Size related
Parameter type: Range, 0 - 500%
Setup: All setups
Conversion index: 0
Data type: Uint16
Change during operation: False
Asynchronous motor: Set the frequency of the flying start test pulses that are used to detect the motor direction. For asynchronous
motors, the value 100% means that the slip is doubled. Increase this value to reduce the generated torque. For synchronous motors,
this value is the percentage n
m,n
of the free-running motor. Above this value, flying start is always performed. Below this value, the
start mode is selected in
parameter 1-70 Start Mode
.
AU373327181955en-000101 / 130R1208 | 79
Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
