Honeywell SmartVFD HVAC2 Applications Manual page 127

Figures "Linear and squared change of motor
voltage" on page 126 and "Programmable U / f
curve" on page 126.
When the parameters 1.1 and 1.2 (nominal
voltage and nominal frequency of the motor) are
set, the parameters 1.10 and 1.11 are
automatically given the corresponding values. If
you need different values for the field weakening
point and the voltage, change these parameters
after setting the parameters 1.1 and 1.2.
U / f middle point frequency
If the programmable U / f curve has been
selected with the parameter 1.9, this parameter
defines the middle point frequency of the curve.
See Figure "Programmable U / f curve" on
page 126.
U / f middle point voltage
If the programmable U / f curve has been
selected with the parameter 1.9, this parameter
defines the middle point voltage of the curve. See
Figure "Programmable U / f curve" on page 126.
Zero frequency voltage
This parameter defines the zero frequency
voltage of the curve. See Figures "Linear and
squared change of motor voltage" on page 126
and "Programmable U / f curve" on page 126.
Torque boost
When this parameter has been activated, the
voltage to the motor changes automatically with
high load torque which makes the motor produce
sufficient torque to start and run at low
frequencies. The voltage increase depends on the
motor type and power. Automatic torque boost
can be used in applications with high load torque,
e.g. in conveyors.
Disabled
0 =
Enabled
1 =
NOTE: In high torque - low speed applications -
it is likely that the motor will overheat. If
the motor has to run a prolonged time
under these conditions, special atten-
tion must be paid to cooling the motor.
Use external cooling for the motor if the
temperature tends to rise too high.
127 31-00108—07