Danfoss VACON NX, Application Manual

Page: 170 / 360

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10.9 (ID 109) U/f Optimization
Location in the menu:
P2.13 (Basic Application)
P2.6.2
(Standard Application, Local/Remote Control Application, Multi-Step Speed Control Application, PID Control Application,
Multi-Purpose Control Application, Pump and Fan Control Application)
Use this parameter to set the U/f optimization.
Programmable
Torque boost
Mid point frequency
F
N
FWP
Zero point voltage
Mid point voltage
FWP Voltage
U
N
Linear
Squared
e
3
0
b
h
1
0
0
.1
0
Illustration 27: U/f Optimization
The voltage to the motor changes in proportion to required torque which makes the motor produce more torque at start and when
running at low frequencies. Automatic torque boost can be used in applications where starting torque due to starting friction is
high, for example, in conveyors.
To start with high torque from 0 Hz, set the motor nominal values (Parameter group
2.1
) either automatically (see 10.9.1 Setting the
Motor Nominal Values with Automatic Functions ) or manually (see 10.9.2 Setting the Motor Nominal Values Manually ).
C A U T I O N
MOTOR OVERHEATING
In high torque – low speed applications – it is likely that the motor overheats. If the motor has to run a prolonged time under
these conditions, special attention must be paid to cooling the motor.
Use external cooling for the motor if the temperature tends to rise too high.
10.9.1 Setting the Motor Nominal Values with Automatic Functions
To start with high torque from 0 Hz, set the motor nominal values (Parameter group 2.1).
Procedure
Make identification run (ID 631) with rotating motor.
If needed, activate the speed control or U/f optimization (Torque boost).
If needed, activate both the speed control and U/f optimization.
AB296635287482en-000301 / DPD00903 170 | Danfoss A/S © 2023.02
Parameter Descriptions
VACON® NX All-in-One
Application Guide