Trial Operation
4-7
îš‹ Selecting the V/f pattern
• Set either one of the fixed patterns (0 to E) in E1-03 (V/f Pattern Selection) or set F in E1-03 to specify a
user-set pattern as required for the motor and load characteristics in E1-04 to E1-13 in advanced program-
ming mode.
• It is recommended to perform non-rotating autotuning for the line-to-line resistance if the motor cable is 50
m or longer for the actual installation or the load is heavy enough to produce stalling.
îš‹ Autotuning
îš„Autotuning for Line-to-Line Resistance
Autotuning can be used to improve the performance when very long motor cables are used or when motor and
inverter have different power ratings.
To perform autotuning set T1-02 (Motor rated power) and T1-04 (Motor rated current) and then press the
RUN key on the Digital Operator. The Inverter will supply power to the motor for approximately 20 seconds
and the line-to-line resistance (stator windings and cable resistance) will be measured automatically.
îš„Parameter Settings for Autotuning
The following parameters must be set for autotuning.
Table 4.1 Selecting the V/f Pattern
Motor V/f Selection
General purpose motor at 50 Hz
E1-03 = 0
E1-03 = F (default)(Parameters E1-04 to E-13 are
changeable and preset for 50 Hz)
General pupoase motor at 60 Hz E1-03 = 1
IMPORTANT
Power will be supplied to the motor during autotuning but the motor will not turn. Do not touch the
motor until autotuning has been completed.
Param-
eter
Num-
ber
Name Display Setting Range
Factory Set-
ting
T1-02
Motor out-
put power
Set the output power of the motor in Kilowatts.
10% to 200% of
Inverter rated
output
Same as
Inverter rated
output
T1-04
Motor rated
current
Set the rated current of the motor in Amps.
10% to 200% of
Inverter rated
current
Same as gen-
eral-purpose
motor with
same capacity
as Inverter
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