Precautions for Correct Use
•
Even if you set H001 to 01 (Auto-tuning without motor rotation), for example, the 4-pole
motor may rotate by approximately up to 1/8 of a rotation (half the inverse of poles).
•
To perform auto-tuning for a motor one size smaller in capacity than the inverter, set the
1st/2nd Overload Limit Selection (b021/b221) to 01 (Enabled during acceleration and con-
stant speed) and set the 1st/2nd Overload Limit Level (b022/b222) to 150% of the rated cur-
rent of the motor.
•
If the Overvoltage Suppression Integral Time During Deceleration (b134) is too small, an
Overvoltage trip (E07.) may occur during auto-tuning. In this case, increase the b134 value
and retry auto-tuning.
•
Make sure the following points before starting auto-tuning with motor rotation enabled.
There is no problem even if the motor rotates up to approximately 80% of the base frequency.
The motor is not driven by external equipment.
The brake is released.
During auto-tuning, the inverter does not provide sufficient torque, which could result in a slip-and-fall
accident in elevating or other applications. To prevent this, remove the motor from the load and per-
form the auto-tuning with the single motor. In this case, because the moment of inertia J is given for
the single motor, calculate the motor-shaft conversion of the moment of inertia of the load machine
and add it to this value.
In applications such as an elevator or ball screw where the amount of motor shaft rotation is limited, the
motor may rotate over the allowable rotation amount, which may result in a mechanical damage. Be
sure to perform auto-tuning with the single motor, or select the no motor rotation mode (H001 = 01).
•
Adequate auto-tuning may not be performed if a motor cable is long (longer than 20 m).
4 Operations after auto-tuning
•
After normal termination of auto-tuning, set the 1st/2nd Motor Parameter Selection
(H002/H202) to 02 (Auto-tuning parameter).
This enables the 1st/2nd Motor parameters (H030 to H034/H230 to H234) set by the auto-tun-
ing function.
•
During auto-tuning without motor rotation, the Motor Parameter Io (No-load current) and
Motor Parameter J (Moment of inertia J) values are not measured. Set the following parame-
ters after completion of auto-tuning.
1st/2nd Motor Parameter Io (H033/H233): Measure and set in advance the no-load current of
the single motor at 50 Hz.
Alternatively, check the no-load current of the motor
at 50 Hz with the motor manufacturer and set it.
1st/2nd Motor Parameter J (H034/H234): Calculate and set the motor-shaft conversion of
the moment of inertia of the load machine.
•
At the end of auto-tuning, the inverter automatically resets the Auto-tuning Selection (H001)
to 00 (Disabled).
To retry auto-tuning, set H001 again to enable auto-tuning.
Precautions for Correct Use
Set again the DC Injection Braking Selection (A051), 1st/2nd Output Voltage Gain
(A045/A245), and Simple Position Control Selection (P012) values which you set to Disabled in
“1. Presetting of parameters” according to your operating environment.
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