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Chapter 6 Fault Code Information and Maintenance
6.1 Fault Code Information
6.2 Maintenance and Inspections
The AC motor drive has various warnings and protections against errors such as over-voltage, low
voltage, or over-current. Once an error occurs, the protections activate, the AC motor drive stops output,
activates the error contacts, and the motor coasts to stop. Please refer to the error display from the AC
motor drive and look up the corresponding causes and solutions. The fault record is stored in the AC
motor drive internal memory and can store the five most recent error messages. You can read it from the
digital keypad or through the communications by accessing the parameters.
The AC motor drive includes a large number of electronic components, including ICs, resistors,
capacitors, transistors, and cooling fans. These components do not last forever. Even under normal
circumstances, they will eventually become error-prone if used past their lifespans. Therefore, you must
perform periodic preventive maintenance to identify defective and worn out parts, and eliminate the
causes of malfunctions in the AC motor drive at an early stage. At the same time, parts that have
exceeded their product life should be replaced whenever possible to ensure safe operation.
Visual checks should be done regularly to monitor the AC motor drive's operation, and to make sure
nothing unusual happens. Check the situations listed in the following table.
Wait five seconds after a fault has been cleared before pressing RESET with the
input terminal keypad.
The drive must first be switched off for at least five minutes for ≤ 22 kW models
until the charging indicator turns off before it is safe to open the cover to begin
maintenance operations.
Only qualified personnel can work on maintenance or replace parts. (Remove
metal items such as watch, rings, and other metal items before operation, and use
only insulated tools.)
Never modify internal components or wiring.
The performance and the surrounding environment should meet the standard
specifications. There should be no abnormal noise, vibration, or odor.
Verify if the keypad displays normally. Check if there is any abnormality such as
overheating or color change. Prevent the drive from electronic shock and equipment
accident.
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