74
6 - Parameter Descriptions
F27: Torque Boost Select
Range: 0 - 1 (Default: 0)
Description: This function is used to increase the starting torque at a low speed by increasing
the output voltage of the drive. If boost value is set higher than required, it may
cause the motor flux to saturate causing an overcurrent trip. Increase the boost
value when the distance between the drive and motor is long.
Display:
Function:
0 Manual Torque Boost
1 Auto Torque Boost
Manual Torque Boost:
Set F27 to 0 (Manual torque boost).
The values of Torque boost in foward/reverse direction are set separately in F28
and F29.
Auto Torque Boost
:
Before Auto Torque Boost setting, H34 and H42 should be set correctly (see page
93 and 96).
Select 1 (Auto Torque Boost) in F27.
The drive automatically calculates torque boost value using motor parameters and
outputs the corresponding voltage.
If the boost value is set much higher than required, it may
cause motor overheating due to over-energizing, or
overcurrent trips.
CAUTION
FX
Time
RX
Voltage
FX torque
boost
No torque boost
100%
RX torque
boost
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