48
Parameter Descriptions
Honeywell
9
1.11
V
OLTAGE
AT
FIELD
WEAKENING
POINT
Above the frequency at the field weakening point, the output voltage remains
at the value set with this parameter. Below the frequency at the field weaken-
ing point, the output voltage depends on the setting of the U/f curve parame-
ters. See parameters 1.9 - 1.14 and Figures 9.1 and 9.2.
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.
1.12
U/
F
CURVE
,
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 9.2.
1.13
U/
F
CURVE
,
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 9.2.
1.14
O
UTPUT
VOLTAGE
AT
ZERO
FREQUENCY
This parameter defines the zero frequency voltage of the curve. See Figures
9.1 and 9.2.
1.15
T
ORQUE
BOOST
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.
0
= Disabled
1
= Enabled
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, spe-
cial attention must be paid to cooling the motor. Use external cooling for the
motor if the temperature tends to rise too high.
1.16
S
WITCHING
FREQUENCY
Motor noise can be minimised using a high switching frequency. Increasing
the switching frequency reduces the capacity of the inverter unit.
Switching frequency for SmartDrive Compact: 1.5…16 kHz.
