GE Fuji Electric AF-300 Mini Startup Manual page 68

F03 Maximum Frequency
Sets the maximum frequency to drive the motor. Setting
the frequency out of the rated range for the equipment
driven by the drive may damage the system or cause it
to malfunction. Set a maximum frequency appropriate
for the equipment.
CAUTION
As the drive can easily set high-speed operation, care-
fully verify the allowable specifications of the motor and
its load before changing speed settings.
Otherwise injuries could occur.
F04 Base Frequency
Set the rated frequency printed on the nameplate
labeled on the motor.
F05 Rated Voltage (at Base Frequency)
Set 0 or the rated voltage printed on the nameplate
labeled on the motor.
– If 0 is set, the drive outputs the same voltage and
frequency of the the source power. In this case, the
output voltage will vary in line with any variance in
input voltage.
– If the data is set to anything other than 0, the drive
automatically keeps the output voltage constant
in line with the setting. When any of the automatic
torque boost, automatic energy saving or slip com-
pensation are active, the voltage settings should be
equal to the rated voltage of the motor.
NOTE: If the rated voltage of the motor is set to
F05, the motor efficiency will be increased more
than when 0 is set. Therefore, when brakes are
applied to the motor, energy loss decreases and
the motor regenerates higher braking energy than
it would otherwise. Note that the allowable power
consumption capacity of the drive for braking
energy is limited by the specifications, so it may be
necessary to increase deceleration time or to use an
external braking resistor.
Load Selection/Auto Torque Boost/Auto
F09
Energy Saving
F37
Torque Boost
There are two different properties of loads – the torque
load reversal proportional to the square of speed and
the constant torque load. You can select a V/f pattern
optimized to the load properties.
Manual torque boost
This feature manually adjusts the starting output voltage
by setting F09 to an optimal torque boost rate to match
the motor and its load. Select a V/f pattern from two
types of loads with F37.
Setting an excessive torque boost rate may result in
over-excitation and overheating of the motor during
no-load operation.
Manual torque boost keeps the output voltage constant
even if the load varies, assuring stable motor operation.
Automatic torque boost
This feature automatically optimizes the output voltage
to match the motor and its load. Under a light load, it
decreases the output voltage to prevent the motor from
over-excitation; under heavy load, it raises the output
voltage to increase torque.
Since this feature is related to the motor characteristics,
it is necessary to set the rated voltage at base frequency
(F05) and motor parameters (P codes) properly.
Auto energy saving
This feature controls the terminal voltage of the motor
automatically to minimize motor power loss. (Note that
this feature may not be effective depending on the
properties of the motor. Check the properties before
using this feature.)
The drive enables this feature only for constant speed
operation. During acceleration and deceleration, the
drive will run with manual or automatic torque boost,
depending on the data setting of function code F37. If
auto energy saving operation is enabled, switching the
motor from constant speed will become less responsive.
Do not use this feature for a system that requires quick
acceleration and deceleration.
Given below are proper setting examples with the
combination of F09 and F37.
– If auto energy saving operation is not selected:
To select manual
Load type
torque boost, set:
F37 = 0
Variable torque
F09 = 0.0 to 20.0 (%)
F37 = 1
Constant torque
F09 = 0.0 to 20.0 (%)
5-10
To select
automatic torque
boost, set:
F37 = 2