Chapter 6 - Parameter Description [FU2]
103
This function is used to permit automatic restarting after
Power ON, Fault Reset, and Instant Power Failure
without waiting for the motor to stop.
The speed search gain should be set after considering
the inertia moment (GD
2
) and magnitude of torque of the
load. FU2-37 [Load Inertia] must be set at the correct
value to make this function operate correctly.
FU2-22 [Speed Search Select]
Setting Range
4
th
bit 3
rd
bit 2
nd
bit 1
st
bit
Description
0
0
0
0 Speed search function does not work
0
0
0
1 Speed search during Accelerating
0
0
1
0
Speed search during a Fault Reset
restarting (FU2-21) and Auto
restarting (FU2-26)
0
1
0
0 Speed search during Instant Power
Failure restarting.
1
0
0
0 Speed search during Power ON
starting (FU2-20)
When FU2-22 is set to ‘1111’, Speed Search works for all
conditions.
FU2-22
[Speed Search Selection] selects the speed
search function.
FU2-23
[Current Limit Level] is the current that the
inverter limits its current rise during speed searching.
(The set value is the percentage of FU2-33 [Rated Motor
Current])
FU2-24
[P Gain] is the proportional gain used for speed
search. Set this value according to load inertia set in
FU2-37.
FU2-25
[I Gain] is the Integral gain used for speed
search. Set this value according to load inertia set in
FU2-37.
[Speed Search Operation]
FU2-26: Number of Auto Restart Attempt
FU2-27: Delay Time Before Auto Restart
This function is used to allow the inverter to reset itself
for a selected number of times after a fault has occurred.
The inverter can restart itself automatically when a fault
occurs. To use the speed search function during auto
restarting set FU2-22 to ‘xx1x’. See FU2-22 ~ FU2-25.
When an under voltage (LV) fault, inverter disable (BX)
Input Power
Time
Motor Speed
Time
Output Frequency
Output Voltage
Time
Time
Input Power loss
FU2? SS P-gain
24 100
100
24
Factory Default:
100
100
FU2? SS I-gain
25 200
200
25
Factory Default:
200
200
FU2?Retry number
26 0
0
26
Factory Default:
0
0
FU2?Retry delay
27 1.0 sec
1.0
27
Factory Default:
1.0 sec
1.0
Related Functions:
FU2-20 [Power ON Start]
FU2-21 [Restart after Fault Reset]
FU2-26 ~ FU2-27 [Auto Restart]
FU2-30 ~ FU2-37 [Motor Parameters]
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