57
FX BOOST FACTORY DEFAULT SETTINGS
FACTORY
FACTORYFACTORY
FACTORY FACTORY
FACTORYFACTORY
FACTORY
HP
HPHP
HP DEFAULT
DEFAULTDEFAULT
DEFAULT HP
HPHP
HP DEFAULT
DEFAULTDEFAULT
DEFAULT
0.25 - 1 5.30 % 15 2.20 %
1.5 - 2 4.40 % 20 2.00 %
3 3.60 % 25 1.80 %
5 3.00 % 30 1.60 %
7.5 2.70 % 40 1.20 %
10 2.40 % 50 - 60 0.80 %
For example, if the drive is rated for 460 Vac output, and the BASE FREQUENCY
is set to 60 Hz, the drive will maintain a constant ratio of 7.66 V/Hz (except when
AC BOOST or FX BOOST are active, see Parameters 19 and 20) from 0 Hz to 60
Hz. This range is the region of constant torque. If the motor speed is increased
past 60 Hz, the output voltage remains constant while the frequency increases,
resulting in a reduced V/Hz ratio. This range, from 60 Hz to about 90 Hz, is the
region of constant horsepower. Above 90 Hz, horsepower begins to decrease as
frequency increases. Refer to Section 6.1 - DESCRIPTION OF AC MOTOR
OPERATION.
19 FX BOOST (FIXED BOOST)
This parameter is used in applications which require high starting torque. FX
BOOST increases the output voltage at lower output frequencies (below 30 Hz
for 60 Hz base frequency), in order to boost the torque capability of the motor.
Refer to the diagram below. The factory default for FX BOOST depends on the
horsepower rating. Refer to the table below:
20 AC BOOST (ACCELERATION BOOST)
AC BOOST is similar to FX BOOST, but is only active when the drive is
accelerating. During acceleration, the output voltage is increased according to the
setting of AC BOOST, which increases motor torque. Refer to the diagram below.
AC BOOST, like FX BOOST, is used in applications with high-inertia loads.
The diagram below illustrates how FX BOOST and AC BOOST alter the V/Hz
ratio to increase motor torque.
FX BOOST sets the boost at 0 Hz (approximately 15% in the example above),
and as the output frequency approaches 30 Hz, the boost decreases to zero.
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