Trial Operation
4-7
Autotuning
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 non-rotating motor for approximately
20 seconds and the line-to-line resistance and motor + cable resistance will be automatically measured
Constant Settings for Autotuning
The following constants must be set before autotuning.
* 1. For a constant-output motor, set the value at the base speed.
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.
Table 4.1 Constant Settings before Autotuning
Con-
stant
Num-
ber
Name Display
Setting
Range
Factory
Setting
T1-02
Motor out-
put power
Set the output power of the motor in
Kilowatts.
*1
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.
*1
10% to 200%
of Inverter
rated current
Same as
general-
purpose
motor with
same
capacity as
Inverter
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