Vacon NX series Applications Manual

109 U/F OPTIMISATION (2.13, 2.6.2)
Programmable
Torque boost
Mid point frequency
F
N
FWP
Zero point voltage
Mid point voltage
FWP Voltage
U
N
Linear
Squared
Fig. 26: U/f optimisation
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 or manually.
Setting the motor nominal values with automatic functions
1.
Make identification run (ID631) with rotating motor.
2.
If needed, activate the speed control or U/f optimization (Torque boost).
3.
If needed, activate both the speed control and U/f optimization.
VACON · 238 PARAMETER DESCRIPTIONS
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Vacon NX series Specifications

General

Product type	AC Drive
Output voltage range	0-Uin
Frequency range	0-500 Hz
Enclosure classes	IP00, IP21
Mounting types	Wall
Braking chopper	Integrated or external
EMC filter	Built-in or external
Control modes	Scalar, Vector
Protection features	Overcurrent, overvoltage, undervoltage, overtemperature, short circuit
Communication options	Modbus, Profibus, CANopen, Ethernet
Ambient temperature range	-10°C to +50°C
Cooling method	Air-cooled