TOSHIBA
9.2
USER GROUP PARAMETERS
MAXIMUM FREQUENCY (ITEM 1) - This parameter sets the output frequency to a
maximum value. It is very important that this factory setting not be changed without
first checking the maximum operating speed of the motor and load equipment.
Overspeeding of the motor can cause serious damage to the motor and/or the
driven load equipment.
AUTOMATIC TORQUE BOOST (ITEM 2) - Automatically increases the percentage of
voltage boost when starting torque requirements are abnormally high.
TORQUE BOOST (ITEM 3) - Increases the voltage (voltage boost) to the motor for
increased starting torque.
BASE FREQUENCY OF MAXIMUM VOLTAGE LEVEL (ITEM 4) - Sets the base
operating frequency at which the output voltage is 100%.
STANDARD SETTING MODE SELECTION (ITEM 5) - This parameter automatically
enters the optimum settings for operating either a 50Hz or 60Hz motor or factory default
settings. A
reset to factory settings can be made from this parameter.
ACCELERATION TIME #2 (ITEM 6) - Sets an alternate time required to accelerate
from 0Hz to the maximum frequency (FH). Use function [:SEL2] to select either
acceleration time #1 or #2.
Setting this time too low can cause undue stress and
over current tripping of the drive.
DECELERATION TIME #2 (ITEM 7) - Sets the time required to decelerate from
maximum safe frequency (FH) to 0Hz. Use function [:SEL2] to select either deceleration
time #1 or #2.
Setting this time too low can cause undue stress and over voltage
tripping of the drive.
PATTERN OF ACC/DEC #1 (ITEM 8) - Select one of three output frequency patterns.
These patterns are shown in the pattern curves below. Use function [:SEL2] to select
either acc/dec pattern #1 or #2.
The Linear pattern provides a motor with constant linear acceleration.
The S-shaped pattern gradually accelerates a motor in a range where the motor provides
a low torque. This is particularly suited for material handling machinery.
The C-shaped pattern quickly accelerates a motor in a range where the motor provides
a low torque. This is well suited for a high speed run.
9 - 3
Linear Pattern
TIME
TIME
TIME
Fmax
FREQUENCY
Fmax
Fmax
FREQUENCY
FREQUENCY
S-shaped Pattern
C-shaped Pattern
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