Fu1-23: Frequency Limit Selection; Fu1-24: Low Limit Frequency; Fu1-25: High Limit Frequency; Fu1-26: Manual/Auto Boost Selection - LG SV-iS5 Instruction Manual

Chapter 6 - Parameter Description [FU1]
Output Voltage
Rated
Voltage
FU1-22. FU1-21.
☞
Note: If the command frequency is set lower than the
starting frequency, inverter does not output voltage to
motor.

FU1-23: Frequency Limit Selection

FU1-24: Low Limit Frequency

FU1-25: High Limit Frequency

FU1? Freq limit
23 --- No ---
Factory Default:
No
FU1? F-limit Lo
24 0.50 Hz
Factory Default:
0.50 Hz
FU1? F-limit Hi
25 60.00 Hz
Factory Default:
60.00 Hz
FU1-23 selects the limits for the inverter operating
frequency. If FU1-23 is set to ' Yes' , inverter operates
within the upper and lower limit setting. The inverter
operates at the upper or the lower limit when the
frequency reference is outside the frequency limit range.
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Output
Frequency
FU1-20
23 0
0
24 0.50
0.50
25
60.00
60.00
Output Frequency
Freq. Max
FU1-24
FU1-25
[Freq. limit: ' Yes' ]
☞
Note: Frequency limit does not work during accelerating
and decelerating.

FU1-26: Manual/Auto Boost Selection

FU1-27: Torque Boost in Forward Direction
FU1-28: Torque Boost in Reverse Direction
FU1?Torque boost
26 Manual
Factory Default:
Manual
FU1? Fwd boost
27 2.0 %
Factory Default:
2.0 %
FU1? Rev boost
28 2.0 %
Factory Default:
2.0 %
This function is used to increase the starting torque at
low speed by increasing the output voltage of the
inverter. If the boost value is set too high than required, it
may cause the motor flux to saturate, causing over-
current trip. Increase the boost value when there is
excessive distance between inverter and motor.
[Manual Torque Boost]: The forward and reverse
torque boost is set separately in FU1-27 and FU1-28.
☞
Note: The torque boost value is the percentage of
inverter rated voltage.
☞ Note: When FU1-29 [Volts/Hz Pattern] is set to ' User V/F' ,
this function does not work.
☞
Note: When FU2-40 [Control Mode] is set to ' Sensorless' ,
the torque boost value is the rate per thousand of inverter
rated voltage.
92
Reference Frequency Curve
Output Frequency Curve
Time
26 0
0
27 2.0
2.0
28 2.0
2.0