HVAC400X – APPLICATION MANUAL
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EN2B-0417GE51 R0719
P3.1.2.9 UNDERVOLTAGE CONTROLLER (ID 608)
You can use this parameter to set the undervoltage controller out of operation. When you enable P3.1.2.8 or
P3.1.2.9, the controllers start to monitor the changes in the supply voltage. The controllers change the output
frequency if it becomes too high or too low. To stop the operation of the undervoltage and the overvoltage
controllers, disable these two parameters. This is useful if the supply voltage changes more than -15% to +10%,
and if the application does not tolerate the operation of the controllers.
P3.1.2.10 ENERGY OPTIMIZATION (ID 666)
You can 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.
P3.1.2.11 FLYING START OPTIONS (ID 1590)
You can 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
The bit B0 controls the search direction. When you set the bit to 0, the shaft frequency is searched in two direc-
tions, the positive and the negative. When you set the bit to 1, the shaft frequency is searched only in the frequency
reference direction. This prevents the shaft movements for the other direction.
Bits 64 and 65 provide an enhanced procedure to magnetize an induction motor. It can help, e.g., with high power
motors.
P3.1.2.12 STATOR VOLTAGE ADJUST (ID 659)
You can use this parameter to adjust the stator voltage in permanent magnet motors. It is possible to use this
parameter only when the parameter P3.1.1.8 Motor Type has the value
PM motor
. If you set induction motor as the
motor type, the value is automatically set to 100%, and you cannot change the value.
When you change the value of P3.1.1.8 (Motor type) to
PM Motor
, the U/f curve will increase automatically to be
equal with output voltage of the drive. The set U/f ratio does not change.
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, e.g., 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 P3.1.2.12 gives the drive's output voltage as a percentage of the motor's nominal voltage at the
motor's nominal frequency. 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.
