KEB COMBIVERT F5 Reference Manual page 195

LC32
Low Speed Torque
Boost
i
LC33
Auto Boost Gain
LC34
Digital Pretorque
LC - Control Setting Parameters
Adjusts the torque boost only during open loop operation (LC01 Control
Mode = Open Loop V/Hz or Open Loop Vector). If the torque boost is too low
the motor may not be able to lift the load or "error low motor current" may occur.
Too much or too little torque boost can lead to high current while running
open loop.
If open loop vector is selected, set to 1.00. If oscillations or vibrations are felt,
reduce in steps of 0.1 (1.0 --> 0.9 --> 0.8 etc.).
When US.04 Control Mode = Digital Speed Selection (0), and Binary Speed
Selection (1), Absolute Analog Speed (2), Bi-Polar Analog Speed(3), and
Serial Binary Speed DIN66019, Serv.50 (6) this parameter provides a fixed
pre-torque value and can compensate for roll back at one load condition (i.e.
empty car). This can be used when no load weigher is present. An additional
gain and offset may be applied to this value using LA.15 Analog Input 2 Gain
and LA.17 Analog Input 2 Offset. Refer to section 6.13 for additional information.
Processed Pretorque Value = (LC.34 + LA.17) * LA.15
When using US.04 = Serial Speed DIN66019 Serv. 49 (4), Serial Speed
DIN66019 Serv. 50 (5) the pretorque value is set via FB.03 Field Bus Pretorque.
Therefore LC34 will have no effect. Refer to Section 6.15 for additional
information on using these control modes
Default Setting: 5 %
V
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