Toshiba H7 Operation Manuals page 61

F016
Motor #1 Torque Boost
Program Fundamental Parameters
⇒
The Motor #1 Torque Boost function is used to increase the low frequency
torque for high-inertia loads by increasing the output voltage at frequencies
below ½ of the #1 Base Frequency (F014) setting.
The value programmed as a boost percentage establishes an output voltage vs.
output frequency relationship to be used to start the motor or to provide
smoother operation.
Note: Setting an excessive Torque Boost level may cause nuisance tripping and
mechanical stress to loads.
Soft Stall
Program ⇒ Protection Parameters
This parameter Enables/Disables the Soft Stall function. When enabled, the
Soft Stall function reduces the output frequency of the ASD when the current
requirements of the motor exceed the Electronic Thermal Protection #1
setting (F600); thus, reducing the output current. If the current drops below the
motor overload protection level setting within a specified time, the output of the
ASD will accelerate to the programmed frequency setpoint. If not, a trip will be
incurred.
The Soft Stall feature is available when the (Program
⇒ Overload ⇒ ) Motor Overload Trip Enable/Disable
only.
Soft Stall is highly effective in preventing motor overload trips when used on
fans, blowers, pumps, and other centrifugal loads which require less torque at
lower frequencies.
Note: The Soft Stall setting may affect acceleration times and patterns.
54
Motor Set #1
⇒
⇒ Overload
⇒ Protection Parameters
parameter is enabled
Direct Access Number — F016
Parameter Type — Numerical
Factory Default — (drive dependent)
Changeable During Run — Yes
Minimum — 0.0
Maximum — 30.0
Units — %
Direct Access Number — F017
Parameter Type — Check Box
Factory Default — Not Selected
Changeable During Run — No
H7 ASD Operation Manual
F017