Omron SYSDRIVE 3G3RV, User Manual

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4
-12
n
Precautions Before Using Autotuning
Read
the following precautions before using autotuning.
• Autotuning
the Inverter is fundamentally different from autotuning the servo system. Inverter autotuning
automatically
adjusts parameters according to detected motor constants, whereas servo system autotuning
adjusts
parameters according to the detected size of the load.
• 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 sup-
ply
voltage, the voltage output from the Inverter will be unstable at high speeds and sufficient performance
will
not be possible.
•
Use
stationary autotuning whenever performing autotuning for a motor that is connected to a load.
•
Use
rotational autotuning whenever performing autotuning for a motor that has fixed output characteristics
or
for a motor that is 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.
• If
the wiring between the Inverter and motor changes by 50 m or more between auto tuning and motor
installation,
perform stationary autotuning for line-to-line resistance only.
• If
the motor cable is long (50 m or longer), perform stationary autotuning for line-to-line resistance only
even
when using V/f control.
• The
status of the multi-function inputs and multi-function outputs will be as shown in the following table
during
autotuning. When performing autotuning with the motor connected to a load, be sure that the hold-
ing
brake is not applied during autotuning, especially for conveyor systems or similar equipment.
• To
cancel autotuning, always use the STOP Key on the Digital Operator.
n
Precautions for Rotational and Stationary Autotuning
Use
the following procedure to perform autotuning when the rated voltage of the motor is higher than the volt-
age
of the power supply to the Inverter.
1. Input
the voltage of the input power supply to T1-03 (Motor rated voltage).
2. Input
the results of the following formula to T1-05 (Motor base frequency):
(Base
frequency from the motor’s nameplate × setting of T1-03)/(Rated voltage from motor’s nameplate)
3. Perform
autotuning.
After
completing autotuning, set E1-04 (Maximum output frequency) to the base frequency from the motor’s
nameplate.
Tuning Mode Multi-function Inputs Multi-function Outputs
Rotational
autotuning
Do
not function.
Same
as during normal
operation
Stationary
autotuning
Do
not function.
Maintain
same status as
when
autotuning is started.
Stationary
autotuning for line-
to-line
resistance only
Do
not function.
Maintain
same status as
when
autotuning is started.
IMPORTANT
1. When speed precision is required at high speeds (i.e., 90% of the rated speed or higher), set T1-03 (Motor
rated voltage) to the input power supply voltage multipled by 0.9.
2. When operating at high speeds (i.e., 90% of the rated speed or higher), the output current will increase as
the input power supply voltage is reduced. Be sure to provide sufficient margin in the Inverter current.