6 Programming Features
63
• When speed precision is required at high speeds (i.e., 90% of the
rated speed or higher), use a motor with a rated voltage that is 20 V
less than the input power supply voltage of the Inverter for 200V-
class Inverters and 40 V less for 400V-class Inverters. If the rated
voltage of the motor is the same as the input power supply voltage,
the voltage output from the Inverter will be unstable at high speeds
and sufficient performance will not be possible.
• Use stationary autotuning for motor line-to-neutral resistance only
whenever performing autotuning for a motor that is connected to a
load. (To ensure performance, set the value from the motor test
report.)
• Use rotational autotuning if performing autotuning is possible while
not connected to a load.
• If rotational autotuning is performed for a motor connected to a load,
the motor constants will not be found accurately and the motor may
exhibit abnormal operation. Never perform rotational autotuning for
a motor connected to a load.
• The status of the multi-function inputs and multi-function outputs
will be as shown in the following table during autotuning. When per-
forming autotuning with the motor connected to a load, be sure that
the holding brake is not applied during autotuning, especially for
conveyor systems or similar equipment.
• To cancel autotuning, always use the
key on the Digital
Operator.
Precautions for Using Autotuning(when motor voltage > supply
voltage)
Use the following procedure to perform autotuning if using a motor with a rated voltage
higher than the Inverter input power supply.
1. Input the rated voltage from the motor nameplate for the Maximum Voltage (n012).
2. Set the Maximum Voltage Output Frequency (n013) to the base frequency on the
motor nameplate.
3. Perform autotuning.
4. Record the Motor No-load Current (n110).
Tuning Mode
Multi-function Inputs
Multi-function Outputs
Rotational autotuning
Do not function.
Same as during nor-
mal operation
Stationary autotuning
for motor line-to-neu-
tral resistance only
Do not function.
Maintain same status
as when autotuning is
started.
STOP
