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Overhaul and Maintenance
Output current has reached current limit
Acceleration/deceleration time setting is too short
Improper setting of motor characteristic parameters
Self-learning without vector control
There is a significant deviation between motor speed and frequency command value
Reason
Improper setting of frequency command gain and offset for analog input
Frequency given command source settings for overlay
Mechanical vibration or misalignment when the motor rotates
Reason
Analog frequency command input from the outside
The wiring distance between the drive and the motor is too long
Insufficient adjustment of PID parameters
The output frequency does not reach the command frequency command value
Reason
The set frequency command value is just within the skip frequency range.
The given frequency exceeds the upper limit frequency setting
7
Overhaul and Maintenance
This chapter describes the regular maintenance and maintenance methods during the use of the drive, the replacement method of components such as
cooling fans, and the instructions for keeping the drive.
7.1 Safety Precautions
DANGER
In order to prevent electric shock
Do not perform wiring, inspection, or repair work while the power is on. Be sure to turn off the power to all machines before starting work. After
the power is turned off, there is still residual voltage in the capacitor inside the drive. It is necessary to confirm that the main circuit voltage has dropped
to a safe level, and then perform related operations after 5 minutes. If it is neglected, it may cause personal accidents.
Do not change the wiring, remove the wiring and optional cards, or replace the cooling fan while the drive is running.
When the drive is used to drive the motor, even if the drive's power is turned off, the induced voltage will be generated at the motor terminals during
the motor rotation. Wait until the motor line is disconnected or confirm that the motor is no longer rotating. There is a danger of electric shock due to
incorrect operation.
WARNING
In order to prevent electric shock
Do not operate with the drive cover removed, otherwise there is a risk of electric shock.
Be sure to operate the drive in accordance with the instruction manual with the specified cover or cover installed.
Be sure to ground the ground terminal on the motor side, otherwise it may cause electric shock due to contact between the person and the motor case.
Non-electrical construction professionals should not perform wiring, installation, inspection, maintenance, component replacement or repair work,
otherwise there is a risk of electric shock.
Do not perform the operation of the drive if you are wearing loose clothing or wearing accessories. If you take off metal objects such as watches and
rings and wear loose clothes before work, there is a danger of electric shock.
To prevent fire
Fasten the terminal screws in accordance with the tightening torques in this book. If the tightening torque is insufficient, it may cause a fire due to
overheating of the connecting part.
If the tightening torque exceeds the specified tightening torque, it may cause malfunction of the device, damage to the terminal block or fire.
Do not mistake the voltage of the main circuit power supply. Before powering on, please confirm whether the rated voltage of the drive is consistent
with the power supply voltage. If the main circuit power supply voltage is used incorrectly, there is a danger of fire.
Do not allow inflammables to come into contact with the drive or attach flammable materials to the drive. Install the drive on a flame retardant object
such as metal. Otherwise there is a risk of fire.
AC10 Series Frequency Inverter Technical Manual
Replace the larger power motor
Reduce the load
Replace the larger power motor
Increase F01.22, F01.23 [addition and deceleration time]
Check F4.00 [V/f curve selection] to confirm whether the V/f curve matching
the motor characteristics is selected.
Rotating self-learning
Motor self-learning
Change the control mode to VF control if possible
Countermeasures
Check if the relevant parameter value setting of the analog input terminal is
appropriate.
Terminal AI1: F05.40~F05.44 [terminal AI1 related parameters]
Terminal AI2: F05.45~F05.49[terminal AI2 related parameters]
Check F1.07 [Frequency Reference Source Selection] to confirm the
frequency reference source
Countermeasures
Check if the external signal line is affected by noise
Try to isolate the main circuit wiring and the control loop wiring. The signal
line of the control loop uses shielded wires or stranded wires.
Increase the set value of the analog input filter time constant
Minimize wiring length
Re-adjust F13.xx [PID Control Parameter Group]
Countermeasures
Adjust F07.44, F07.46 [jump frequency 1, 2] and F07.45, F07.47 [jump
frequency amplitude 1, 2]
Note: When the skip frequency is valid, the output frequency does not
change within the range of the skip frequency.
View F01.11 [Upper Frequency Source Selection] and confirm the upper
limit frequency setting
50
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