Crane Source Space Vector SV100 - Page 67

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Output volt.
Output freq.
Boost value
100%
Base frequency
5.2.9 Torque Boost
F15: Forward Torque Boost (Factory Default: 5%)
Range:0 - 20 %
F16: Reverse Torque Boost (Factory Default: 2%)
Range:0 - 20 %
The forward and reverse torque boost value can be set separately. This function is
used to increase the output voltage to the motor at low speeds for a higher
volts/hertz ratio, resulting in a much higher starting current output to the motor. This
is for loads that require relatively higher torque than normal starting torque.
Note: If the torque boost is set too high an Overcurrent fault may occur. When this
occurs reduce the Torque Boost values.
Fig. 5.2.9: Torque Boost in Linear Pattern
Fig. 5.2.10: Torque Boost in S-Curve Pattern
Output Voltage
H2
H4
H3
H5
voltage
frequency
Output Frequency
Base Frequency
100%
Boost value
Fig. 5.2.8: User V/F Pattern