Chapter 6 - Parameter Description [FU2]
6-32
resistance] is set twice more than auto-tuned
value.
[Detail Tuning Method for Sensorless Vector
Control]
▣ Adjust the FU2–44 [No Load Motor Current
(RMS)] value larger or smaller by 5% units if
the current is larger or smaller than that of V/F
control under small load.
▣ Adjust the FU2–42 [Rated Motor Slip] value
larger or smaller by 5% units if the speed is
faster or slower than that of V/F control with
rated load.
FU2-61~63: Auto tuning
All of the motor parameters can be tuned by setting
“YES (1)”. Auto tuning is deactivated when “No (0)”
is selected.
[Parameter display based on Inverter capacities]
Motor parameters
Class Inverter
Rs Lsigma Ls Tr
5.5[kW]
X.XXX
ohm
X.XX
mH
X.XX
mH
XXX
ms
200V
7.5[kW] ~
30[kW]
X.X
mohm
X.XXX
mH
X.XX
mH
XXX
ms
5.5[kW] ~
15[kW]
X.XXX
ohm
X.XX
mH
X.X
mH
XXX
ms
400V
18.5[kW]
~ 30[kW]
X.X
mohm
X.XXX
mH
X.XX
mH
XXX
ms
Note: Unit is not displayed on 7-Segment keypad.
The auto tuning function automatically measures the
motor parameters needed for control selected in FU2-
60 [Control mode] such as stator resistance, rotor
resistance, leakage inductance, no-load current and
Encoder feedback frequency.
The rated current, voltage, efficiency and slip
described in the motor nameplate should be entered
before performing auto tuning. If efficiency is not
indicated on the nameplate, use the preset value.
.
FU2-64: Pre-excitation Time
When the operation command (FWD, REV) is issued,
the inverter conducts pre-exciting automatically for
the time specified by this parameter.
After FU2-64 [Pre-excitation Time] elapses the
inverter starts normal operation shown in the
following graph.
Code LCD display Default Setting range
FU2-64 PreExTime 1 [sec] 0 ~ 60 [sec]
FU2
► Auto tuning
61 NO
0 61
Factory Default: NO 0
FX-CM
Output freq
[Hz]
Output
voltage [V]
T1 = Pre-excitation time
FU2
► PreExTime
64 1.0 sec
1.0 64
Factory Default: 1.0 sec 1.0
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