Vacon 100 hvac Applications Manual page 116

VACON · 116
This is done to prevent the operation of the PM motor in the field weakening area. The
nominal voltage of the PM motor is much lower than the full output voltage of the drive.
The nominal voltage of the PM motor agrees to the back-EMF voltage of the motor at
nominal frequency. But in a different motor manufacturer, it can be equal to, for example,
the stator voltage at nominal load.
Stator Voltage Adjust helps you to adjust the U/f curve of the drive near the back-EMF curve.
It is not necessary to change the values of many U/f curve parameters.
The parameter P3.1.2.17 gives the output voltage of the drive in percentage of the nominal
voltage of the motor at the nominal frequency of the motor. Adjust the U/f curve of the drive
above the back-EMF curve of the motor. The motor current increases the more the U/f curve
is different from the back-EMF curve.
Field Weakening
Point Voltage
Motor Nominal
Voltage
Zero Frequency
Voltage
Fig. 14: The stator voltage adjustment
P3.1.2.18 ENERGY OPTIMIZATION (ID 666)
Use this parameter to enable the Energy Optimization function.
To save energy and to lower the motor noise, the drive searches for the minimum motor
current. You can use this function for example in fan and pump processes. Do not use the
function with fast PID controlled processes.
P3.1.2.19 FLYING START OPTIONS (ID 1590)
Use this parameter to set the flying start options.
The parameter Flying Start Options has a checkbox selection of values.
The bits can receive these values.
Disable reverse direction search
•
Flux build with current control
•
10
U [V]
Stator Voltage Adjust
(50..200%)
Motor Nominal
Frequency
PARAMETER DESCRIPTIONS
Field
Weakening
Point
TEL. +358 (0)201 2121 · FAX +358 (0)201 212 205
f [Hz]