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Chapter 6 - Parameter description [FU1]
6-14
☞
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
FU1-23 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.
[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
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.
Output Voltage
Rated
Voltage
Output
Frequency
FU1-22. FU1-21.
FU1-20
FU1
►
Fre
q limit
23 --- No ---
0
23
Factory Default: No 0
FU1
►
F-limit Lo
24 0.50 Hz
0.50 24
Factory Default: 0.50 Hz 0.50
FU1
►
F-limit Hi
25 60.00 Hz
60.00
25
Factory Default: 60.00 Hz 60.00
Out
p
ut Fre
q
uenc
y
Freq. Max
Time
FU1-24
FU1-25
Reference Frequency Curve
Out
p
ut Fre
q
uenc
y
Curve
FU1
►
Torque boost
26 Manual
0 26
Factory Default: Manual 0
FU1
►
Fwd boost
27 2.0 %
2.0 27
Factory Default: 2.0 % 2.0
FU1
►
Rev boost
28 2.0 %
2.0 28
Factory Default: 2.0 % 2.0