Delta VFD-ED Series, User Manual

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Ch15 Suggestions and Error Corrections for Standard AC Motor Drives | VFD-ED
15-2
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 six 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, cooling fans and relays. 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 Hybrid Servo Controller must first be switched off for at least five minutes for
≤
22 kW models, and 10 minutes for
≥
30kW models until the charging indicator
turns off, and the voltage between terminals – must be lower than 25 V
DC
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.